2018 Phosphor Global Summit Agenda
At the 16th annual Phosphor Global Summit, attendees learned firsthand about the latest technical innovations and novel applications that are helping to support the steady growth of the phosphor industry.
Workshop | March 13th
Workshop - Phosphor Materials under High Drive Conditions
Application perspective on phosphor materials at high drive. This session will feature insight on applications, what to expect in the future, observations of behavior, possible thoughts and means to mitigate
Laser-Based Light Source Conversion Materials, Performance and Future Potential
Dr. Alan Lenef | Senior Staff Scientist in Materials R&D of OSRAM Opto Semiconductors
- Rationale and basic principles behind light sources based on lasers and conversion luminescence
- Main applications and market needs considerations for such sources: from Medical to General lighting
- Critical materials characteristics and physical mechanisms that control overall source performance
- Interplay of materials characteristics and laser conversion performance
- Main challenges and roadblocks for improving
- Outlook on future: niche or mainstream?
Is Phosphor Conversion Keeping Pace With SLL Technology Developments?
Dr. Danielle Chamberlin | Director of Converter Technology of Lumileds
To meet the ever increasing market requirements for higher power and luminance, blue LED flux is continuing to increase. For white performance to keep pace, phosphor materials will need to continue to exhibit linearity in this range of blue flux. Approaches to improve phosphor linearity through LED architecture as well as phosphor material engineering will be discussed.
Advances in High Luminance White Light Sources Based on Laser-Pumped Phosphor
Dr. James Raring | President and VP Engineering of SLD Laser
With the increasing demand for high-luminance energy-efficient light sources, laser diode pumped phosphor technology is gaining widespread recognition as a candidate solution in applications where LEDs are limited by fundamental physics. Here we present the latest in laser diode based white light source technology including compact co-packaged surface mount device architectures and fiber-delivered remote pumped phosphor architectures ideal for application in specialty illumination and automotive lighting. We describe the unique value proposition and report the latest performance characteristics of these novel sources. Finally, we present the outlook and the challenges going forward for laser based white light sources with emphasis on the phosphor requirements and key challenges.
New World of Lighting
Dr. Morgan Pattison | President, Senior Technical Advisor of Solid State Lighting Services, DOE SSL Program
The connection between LED and phosphor development and new applications including human physiological lighting and horticultural lighting.
These presentations will examine various aspects of recombination physics that cause quenching
A Systematic Study of Mn4+ Luminescence in Silicate, Gallate and Germanate Garnets for Phosphor-converted (pc) LED Applications
Dr. Marco Kirm | Professor of University of Tartu
We have performed a systematic investigation of Mn4+ doped complex silicate (e.g. CaY2M2Al2SiO12 M=Al, Ga, Sc; CaY2SnMgGaSi2O12), gallate (e.g. CaY2Sn2Ga3O12) and gerHellmanate garnets. The goal is to understand the influence of the covalence of “Mn4+-ligand” bonding on emission wavelength and crystal field effects on Mn4+ excited states affecting thermal quenching of phosphors, both properties highly relevant to pc-LED applications. The luminescence properties of Mn4+ ions, thermal quenching mechanisms and challenges in materials engineering by cation variation will be discussed. A comparison of crystal field, Racah and T½ parameters with Mn4+ in other hosts will be carried out.
Direct Measurements of Energy Levels in Next Generation Nitride Phosphors
Dr. Alexander Moewes | Professor & Canada Research Chair in Materials Science of University of Saskatchewan
This research presents direct measurements of red emitting energy levels, critical to the color and efficiency of LED phosphors. Modern phosphors use the 5d1 to 4fn+1 transition  of Eu2+, which is an excited state since Eu2+ has no 5d electrons in the ground state. For the first time, we experimentally determine directly the energetic separation of the Eu 5d state and the conduction band , which is the key indicator of quantum efficiency. This was achieved for the three next-generation pcLED phosphors Li2Ca2[Mg2Si2N6]:Eu2+, Ba[Li2(Al2Si2)-N6]:Eu2+, and Sr[LiAl3N4]:Eu2+ using resonant inelastic soft X-ray scattering. Furthermore we directly observe conduction to valence band and 4f to valence band transitions in X-ray excited optical luminescence spectra of Sr[LiAl3N4]:Eu2+ and Sr[Mg3SiN4]:Eu2+.
Understanding Luminescence Quenching
Prof. Dr. Andries Meijerink | Professor of University of Utrecht
The knowledge on radiative decay processes has increased in the past century to a level where we can with great accuracy calculate radiative decay rates (using Fermi’s Golden rule) and the influence of the (photonic) environment. Non-radiative decay however is less well understood but is crucial in application of light emitting materials. Qualitative models and hand waving arguments are often use to explain differences in luminescence quenching temperatures. In addition to intrinsic quenching processes, determined by the electronic configuration of the luminescent center (and host), quenching by defects or impurities plays an important role in luminescent materials. The nature of defects and how they quench luminescence is often a mystery. Saturation and droop at high excitation densities limit the light output in high power devices. Excited state absorption and long excited state lifetimes play a role, but the relation between light output and excitation power is a poorly understood and is complex interplay of quenching processes including reabsorption and (transient) color center formation. A better understanding is however crucial as the need for high power light sources (e.g. in automotive and projection applications) increases. In this presentation a basic (and hopefully insightful) overview of known luminescence quenching processes will be followed by a discussion on how we can increase our understanding of luminescence quenching with a focus on high power applications. New experimental and theoretical capabilities will be discussed that may help to acquire new insights in what limits the light output in current and future light sources.
Networking Lunch with Quantum Dots Forum
This session will feature presentations centered on computational methods to help predict behavior and design materials
Prediction and Realization of the Luminescence Properties of the New Phosphor BaSnSi3O9:Eu2+
Dr. Amador García-Fuente | Professor of University of Oviedo
A model will be presented which allows to predict the luminescence properties of the new phosphor BaSnSi3O9:Eu2+ using the experimental results of BaZrSi3O9:Eu2+  and BaHfSi3O9:Eu2+ . The theoretically found emission wavelength of about 490 nm agrees very well with the experimentally obtained value. The model consists of two steps. First, the local structure around the Eu2+ activator ion is calculated by the DFT-based code VASP [3-4]. Then, the electronic levels of the 4f7 and 4f65d configurations of the Eu2+ ion are computed by the ligand field Hamiltonian H=H0+HEE+HLF+HSO, where H0 represents the energy difference between the 4f and 5d states of Eu2+, HEE the electrostatic electron-electron interaction, HLF the ligand field influence which is described by the angular overlap model [5-6], and HSO represents the spin-orbit interaction. This model is applied to the known phosphors BaZrSi3O9:Eu2+  and BaHfSi3O9:Eu2+ . With the obtained parameters of the ligand field Hamiltonian, together with the structural information obtained from VASP, the luminescence properties of Eu2+ doped BaSnSi3O9 could be predicted.
The Pursuit of Novel Phosphors for the Next Generation of LED Lighting
Jakoah Brgoch | Professor of University of Houston
The development of new phosphors that are necessary for the next generation of high efficiency LED lighting requires a unique approach for materials discovery. Our work has recently established a new approach that uses computational chemistry and machine learning to identify new materials guiding our experimental efforts. By predicting the vibrational properties and electronic structure of potential phosphors compounds, high-efficiency materials can be screened a priori ensuring the only best materials are experimentally explored. Following this methodology, our research has developed a number of materials ranging from borates to nitrides with high efficiency and thermal stability at elevated temperatures. Moreover, the complementary use of computation, machine learning, and synthesis provides the fundamental understanding of the composition, structure, and property relationship necessary for the continued advanced optical materials.
Panel Discussion: Photo-thermal Quenching in Phosphors
Panel participants include Prof. Dr. Andries Meierjink, Prof. Dr. Werner Urland and representatives from Osram, Lumileds, and GE.
Conclusion of Workshop & Networking Break
Day One | March 14th
Ashli Speed | Conference Producer | Smithers Apex
This session will provide an overview of the Phosphor and Quantum Dot Markets highlighting areas of overlap in the LED downconverter industry for lighting and displays.
*Keynote* LED Downconverters: Status of the Phosphors and Quantum Dots Industries
Eric Virey | Senior Market & Technology Analyst of Yole Développement
The LED industry is maturing and entering a new growth cycle driven by high added-value applications such as Human Centric Lighting, automotive or horticultural lighting. A common trend across those applications is an increasing need for higher efficiency and complex spectral engineering. Downconverters are one of the most critical components to achieve those goals. Yet, the phosphor industry is experiencing growing pains and strong revenue pressure due to fierce competition. At the same time, quantum dots are finally transitioning from a 2 decade long research project into a multibillion dollar industry driven by display applications. This presentation will review the current status of the LED downconverter industry (QD and phosphors) in term of market and technology trends and discuss future prospects for both lighting and displays.
This session features presentations on QD materials and phosphors for use in near chip LED color conversion for lighting and displays.
Stabilization of Quantum Dots In Commercial Applications By Various Methods Of Encapsulation
Dr. Robert Nick | Research Scientist of MIT
Quantum Dots have been utilized commercially as narrow linewidth emitters in LCD displays as well as emissive coatings. In these applications, photodegradation of the QD devices had to be minimized through combinations of QD design, matrix formulation and mechanical encapsulation. Using emulsion polymerization to physically encapsulate QDs is one route to stabilizing the QD matrix to photooxidative degradation. Specific example will be discussed.
Breaking Through the Compromise Between Color Quality and Efficiency
Matthew Everett | Senior Director, Product Management & Marketing of Lumileds
With recent breakthroughs in advanced converter materials, processes, and techniques, customers no longer need to choose between color quality and efficiency in their lighting designs. This talk focuses on the improvements in performance, stability, reliability, and robustness of Lumileds’ LED products containing advanced converter technologies, such as narrow band phosphors and quantum dots, and bringing these products to market to meet application needs in the illumination segment.
The Advantages of Perovskite QDs
Samuel Halim | Co-Founder & CEO of Avantama
This talk will discuss the advantages of Perovskite QDs. Avantama Perovskite QDs show best-in-class performance whilst fulfilling the LCD industry’s reliability specifications. The lower production costs allow QD use even in low-cost TVs. The Perovskite QD presented show a more than three times higher absorbance than cadmium- or indium-based QDs making them the ideal solution for QD pixel for applications such LCD colour filters or micro LEDs.
Narrow Band Emission of SrLiAl3N4:Eu2+(SLA) Nitride Red Phosphor For The Application In Light Emitting Diodes
Professor Ru-Shi Liu | Professor, Department of Chemistry of National Taiwan University
A narrow band emission nitride SrLiAl3N4:Eu2+ (SLA) red phosphor prepared through a high-isostatic press (HIP) was coated with organosilica layers in 400 ~ 600 nm thickness to improve its waterproof property. The coated samples showed excellent moisture resistance while retaining an external quantum efficiency (EQE) of 70% of its initial EQE after being aged for 5 days in harsh conditions. White light-emitting diodes (LEDs) of SLA red-phosphors and commercial Y3Al5O12:Ce3+ (YAG:Ce) yellow-phosphor on a blue-InGaN chip were shown high color rendition (CRI = 89, R9 = 69) and low correlated color temperature of 2406 K.
Luminescent Materials Based On Low-Dimensional Perovskites
Marat Lutfullin | CEO of Quantum Solutions
Perovskites materials, such as perovskite quantum dots and zero-dimensional perovskites, are a new class of materials that possess excellent luminescence. We report here our achievements how make perovskite quantum dots with high chemical robustness and high PLQY up to 90-95 %. Also we show a new type of material called zero-dimensional perovskite that has high photoluminescence (PLQY > 60-70 %), outstandingly narrow emission peak (FWHM < 20 nm) and exceptional stability. Furthermore we report an application of low-dimensional perovskites in different optoelectronic devices: LCD displays, light emitting diodes and white lighting.
Quantum Dot Luminescent Micro-Sphere for Cost-Effective Quantum Dot Displays
Dun Bian | General Manager of ZQ Tech
The Quantum Dot Luminescent Micro-Sphere (QLuMiS), developed by ZH-QTech Co., Ltd., is a new kind of robust QD composite featuring of high efficiency, narrow emission bandwidth and excellent long-term operation stability. QLuMiS is fully compatible with current LED packaging process and makes On-Chip QD-LED possible, broadening QD application in small size screen. Moreover, QLuMiS also is suitable for ultra-thin QD film, QD color filter and Micro-LED for cost-effective QD displays.
Uniformly Dispersed and Stable QD/Siloxan Resin for Display Applications
Byeong-Soo Bae | Founder and CEO/ Professor of Solip Tech. Co., Ltd., Korea / KAIST, Korea
Dispersion of QD in polymer resin and stability of its curing products over heat and moisture are key issues for practical applications of QD-base displays. We have developed uniformly dispersed QD in siloxane resin by in-situ sol-gel condensation of organo-silanes mixed with QD. Dispersion stability is almost permanent to uniformly coat or dispense. Its cured films are extremely stable at high temperature and humidity environments. Also, they are stable over photolithography chemicals and plasma illumination. Photo-stability can improve by modifying QD synthesis and siloxane resin composition. Thus, it can apply to phosphor resin in BLU LED encapsulation, color filter, and MicroLED display.
Color Converter Novel Materials
Philippe Gounine | Deputy CEO of NEXDOT
Nanoplatelets have unique optical and electronic properties: they are fluorescent with a color purity that cannot be matched by other phosphors or fluorophores. In addition, their fluorescence lifetime is faster than in other type of nanocrystals and their electronic density of states is continuous, which results in brighter fluorescence when multi-excitonic states are present. We will present this novel material with a focus on novel properties and applications when used as color converter.
Networking Break & Afternoon Refreshments
This session will feature talks on what is driving the need for QDs and phosphors to continue to innovate to meet the demands of future applications beyond lighting and LCD displays. Direct RGB LED is a serious competitor and each has its strengths, weaknesses, and challenges ahead.
Micro-LED Microdisplays Through The Integration of III V-LEDs And Thin Film Transistors
Vincent Lee | Founder & CEO of Lumiode, Inc.
Micro-LEDs are being explored as a new emissive display technology that have luminance potentials well beyond today's displays. We will introduce several micro-LED technologies and discuss Lumiode's technology of integrating micro-LEDs with thin-film transistors for microdisplay applications. In addition, we will discuss the need for color conversion materials and its importance towards full-color micro-LED displays.
Pixel-Level Integration of High-Performance Materials using Elastomer Stamp Transfer Printing
Dr. Chris Bower | CTO of X-Celeprint
A huge opportunity exists for next-generation flat panel displays that demand pixel-level integration of high-performance materials such as single crystal silicon, indium gallium nitride, and indium aluminum gallium phosphide onto panels. When the constraints on materials selection are removed, display makers can make better displays, and it is mass-transfer micro-assembly technology that makes this unconstrained materials selection possible. Elastomer stamp transfer printing will be presented as a simple and scalable form of mass-transfer micro-assembly for making next-generation displays.
LED Digital Signage: Steps After RGB SMD LED
Gary Feather | CTO of NanoLumens
The fast growing $3.5B LED digital display signage market is propelled by SMD RGB LEDs. The transitions to smaller pitch (0.7mm) and highest resolution displays (25M) in the world are driving new core emissive solutions. New solutions in miniLED and uLED will compete/leverage with down conversion materials as architectures and driving methods pass through a dynamic time of innovation in cost and performance.
Panel: Phosphors & Quantum Dots Grudge Match
Eric Virey | Senior Market & Technology Analyst of Yole Développement
Hear from leaders in the Quantum Dot and Phosphor industries and their insight on the future of QD and Phosphors. The panel will discuss what ways these markets compete and complement each other, where one fairs better than the other and what they see as future needs and goals.
Moderated by Eric Virey of Yole Developpement, this panel discussion will include representatives from Lumileds, Osram, GE, Luminit, UBiQD, and more!
Day Two | March 15th
Ashli Speed | Conference Producer | Smithers Apex
Presentations in this session will cover topics such as narrow-red phosphors, color quality, operating range including temperature light emittance, and more.
Development of Special Vivid LEDs for Commercial Lighting
Sungwoo Choi | Principal Engineer of Samsung Electronics
One of the development focuses of Samsung Electronics in LEDs is on achieving the high color quality as well as the high luminous efficacy. We've launched ‘Special color COB series’ in 2017 for premium color quality line-up: Fashion, Meat, and Vegetables. Special color series were developed based on fundamental study on the relationship between various spectral power distributions (SPDs) using spectrum engineering and preference. To determine the most attractive color quality levels based on subjective perceptions, we ran extensive, rigorous preference tests among many demographic groups worldwide. In this study, we will discuss the relationship between preference lighting and various evaluation indices for LEDs such as CCT, CRI, Duv and TM-30-15 indices
Mn4+ Line Emission: Issues and Advancements
William Beers, Ph.D. | DFSS Black Belt / Senior System Engineer of Current, powered by GE
Efficient high-quality LED light depends on the inclusion of red line emitter phosphors in the device. Currently the best phosphors use Mn4+ emission. Well known concerns for these materials include stability under high humidity and temperature, stability under high flux, and lifetimes that are longer than desired for some applications. Considerable research has been occurring to address these concerns and some of the results will be discussed.
Novel Narrow Band Phosphors - Still Needed?
Dr. Frank Jermann | Senior Principal Key Expert - Materials of OSRAM Opto Semiconductors
- Narrow band phosphors – opportunities and challenges
- Strength and weaknesses of existing phosphors and competing QD technology
- Design rules for narrow band phosphors
- Recent OSRAM R&D results on novel narrow band phosphors
Human Centric Lighting – Quality Of Life And Improved Well-Being
Rémy Broersma | Project Manager & Senior Scientist of Philips Lighting
The lighting industry is facing global trends such as population growth, resource challenges and digitization. In addition there is a strong demand for energy-efficient buildings that at the same time support human health, well-being and productivity.
The performance and cost roadmaps of LEDs, combined with the increasing knowledge about how light influences vision, human psychology and physiology through the so-called third photoreceptor enable us to generate high-quality LED lighting solutions that create additional value to society, from sustainability to well-being.
Challenges in Spectral Designs for Human Centric LED Illumination
Dr. Ralf Petry | Lab Manager | Performance Materials | Advanced Technologies | R&D Lighting of Merck KGaA
The next wave in LED lighting is addressing human’s health and well-being under the term “Human Centric Lighting” (HCL). The recent Nobel prize in medicine for the discovery of the circadian clock including the role of light boosts this market trend. The challenges in spectral design of LEDs for HCL is increasing drastically. Modern LEDs ideally deliver high lm/W and high CRI as well as a dynamic change of the spectrum throughout the (“circadian”) day. Those demands can be technically contradictory.
In the talk, different phosphor mixture approaches for HCL LED are compared with respect to their different technical performance features - like color rendering, color change and circadian efficiency (melatonin suppression).
Color Tuning Challenges As LED Luminaires Become A Greater Part Of The Building Management And IoT Space
Eric Haugaard | Director of Product Technology of Cree Lighting
Hear about the challenges luminaire manufacturers are faced with when trying to economically provide luminaire solutions that can color tune while maintaining the strictest requirements for color quality, cost, energy efficiency, color constancy and more. Part of the discussion will cover the pros and cons of the most commonly available phosphor converted sources, including but not limited to, BSY, BSA, etc.
- Understand the value and benefits of integrating LED luminaires into the building management and automation space.
- Evaluate the limitations of existing color tunable luminaire technologies.
- Explore the color gamut makeups necessary to enable efficient and high-quality illumination along with providing highly discernable colors for location identification, emergency egress, etc.
- Describe the necessary improvement’s to phosphor converted sources that will allow luminaire manufacturer’s to provide color tunable solutions that maintain the required color metrics over the life of the installation.
Networking Break | Student Poster Presentation in Exhibit Hall Sponsored by EMD Performance Materials Corp.
Student Poster Session in Exhibit Hall Sponsored by:
This session will feature presentations on the current Phosphor market and new materials and applications that could potentially keep the industry thriving.
Advancing Down-Conversion Emitters For Solid State Device Applications
Dr. Mike Krames | Sr Advisor of Seaborough Research
New applications, beyond general illumination, are pushing the frontier of optical down-conversion materials. Wide color gamut displays represent a new opportunity, as well as applications such as horticulture and remote sensing which require control over emission in the infrared. The typical requirements for practical down-conversion materials make progress in these new areas challenging, but also potentially highly rewarding. Advances for down-converters in general lighting also remain possible. In particular, rare earth ion down-conversion line-emitters (e.g., Eu3+) are well known in the traditional field of luminescence and have been extensively studied and exploited in cases where excitation is made via a charge-transfer transition in the Ultraviolet (UV) C wavelength regime, e.g., using Hg vapor discharge as in the case of fluorescent lamps. Unfortunately, such a strong, direct excitation does not exist at longer wavelengths, and excitation in the violet/blue wavelength regime (the most efficient regime for light-emitting diodes based on gallium nitride) is thwarted by quantum mechanical selection rules related to forbidden transitions. The weak absorbance makes utilization in a compact form factor such as in a light emitting diode impractical, and so far rare earth based line-emitters have not found application in solid state devices. In addition to discussing the trends and opportunities for new down-converter applications, this presentation will specifically look at the challenge of effective excitation of Eu3+ in the blue/violet wavelength regime, with the specific focus on warm white light-emitting diodes for lighting applications. We show that, by careful engineering of several mechanisms, the absorbance of such material may be effectively increased many factors over, closing the gap towards bringing a new family of line-emitting phosphor materials into practical use for solid state devices.
Synthesis techniques and methods and their relation to optical properties.
First-principles Study of Eu2+/Ce3+-Doped Phosphors: ab initio Crystal Site Engineering
Masayoshi Mikami | Senior Scientist , Yokohama R&D Center of Mitsubishi Chemical Corporation
The luminescence of Eu2+- and Ce3+-doped phosphors is studied through density functional theory. Non-luminescent center as well as luminescent center can be identified from the electronic structure of Eu2+ or Ce3+-emission state. Transition energies and Stokes shift are deduced from differences of total energies between the ground and excited states of the systems, in the absorption and emission geometries. The information gained from the relaxed geometries and total energies is further used to evaluate other optical properties such as the full width at half maximum (FWHM) of emission spectrum, using a one-dimensional configuration-coordinate model.
Mn4+ Zero Phonon Line Intensity and Phosphor Luminosity
Mikhail G. Brik | Professor of Institute of Physics, University of Tartu
Efficient red phosphors can considerably improve the main characteristics of modern white LEDs by lowering the correlated color temperature and increasing the color rendering index. The phosphors with the intensive zero-phonon line (ZPL) emission are preferable, since in this case the energy losses are minimized and the phosphor thermal stability can be enhanced. In the present work we suggest a method of increasing the ZPL intensity by preparing solid solutions with different cations at the same crystallographic site, like, for example, CsRbHfF6. The main idea is that such cation substitution lowers the symmetry of the impurity site by removing the inversion center. As a result, the ZPL intensity will be increased.
The most popular applications for Phosphors are light/LED. This session will explore other ways Phosphors can be used and what their future potential is.
Phosphors in Medical Applications: Light Up Cancer From The Inside
Dr. Martin Purschke | Instructor in Dermatology & Assistant in Biochemistry of Wellman Center for Photomedicine Massachusetts General Hospital/Harvard Medical School
The positive properties of light have been known for decades and are already used for in medicine, such as disinfecting surfaces, treat skin disorders, or stimulate hair growth and wound healing. For all these applications, visible light of various wavelengths and different dose is used, which restricts it to mainly superficial applications, due to short penetration depth of these photons. Recently, our laboratory focuses on delivering light emitting nanoparticles (LEN) to a desired location inside of the body. These LEN are then “activated” by deep penetrating photons such as X-rays or IR, to emit a desired wavelength such as UV at the target location with negligible intensity loss. Bringing the photons deeper into the human body opens a cascade of new application in medicine, ranging from wound disinfection and wound healing stimulation after knee or hip surgery to potentially treat cancer with localized UV light.
From Micro-to Nanoscale UV Emitting Phosphors: The hard way of downsizing
Prof. Dr. Thomas Jüstel | Dept. Chemical Engineering of University of Applied Sciences Münster
Nanoscale phosphors are applied in medical diagnostics and therapy. A novel idea is to employ these materials to convert x-rays as used in radiation therapy into UV-C radiation, which is harmful to cancer cells. We performed a systematic investigation of Pr3+ doped ortho-phosphates in order to obtain nanoscale particles with equal properties to microscale particles. It turned out that nanoscale particles show emission spectra which are strongly dependent on the excitation energy i.e. the kind of excitation source. Observed emission spectra are governed by the penetration depth of incident radiation and the peculiarities of the structure of nanoscale particles.
Networking Break | Student Poster Session in Exhibit Hall Sponsored by EMD Performance Materials Corp.
Student Poster Session in Exhibit Hall Sponsored by:
Phosphors For Ex-Situ and In-Situ Temperature Sensing in Harsh Environments
Dr. Hergen Eilers | Sr. Scientist & Associate Director, ISP/Applied Sciences Laboratory of Washington State University
We develop and test temperature sensors for use in extreme conditions / harsh environments such as explosions, shock loading, forensic fire and arson investigations, etc. The sensors are based on lanthanide-doped organic and inorganic materials (e.g., Dy:YAG, Eu:ZrO2, Dy(acac)x(TOPO)y, etc.) for ex-situ and in-situ measurements. We have successfully tested ex-situ temperature and thermal impulse (temperature and time) sensors in explosions. In this case, the luminescence properties of various lanthanide ions are used to monitor temperature-induced irreversible phase transitions in the sensor materials. We have also developed optical-fiber-based in-situ temperature sensors (optical thermocouples). In this case, two-color fluorescence thermometry of lanthanide-based phosphors is used to measure and image temperature profiles for heating events with durations from microseconds to extended periods of time.
Red Components for Horticultural Lighting
Dr. Sadakazu Wakui | Engineer of LED Back-End Material Engineering Department of Nichia
Nichia’s phosphor technology has realized broad-band red LEDs to augment red components for horticultural lighting. These LEDs can change the ratio of red to far-red component. Nichia will talk about the detail and the advantage of its phosphor based LEDs.
Student Poster Award Winners Announcement
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