Day 2 | Friday
For the material focused sessions taking place on Day 2 of the conference, attendees are not limited to one interest area and are free to attend presentations from either conference track!
Day 2 | Friday
Registration Table Open and Hot Breakfast Available
Quantum Dots Track
This session will deep-dive into the latest and greatest QD innovations in academia and industry.
A Technical Roadmap and Progress of QLED TV, But Remaining Hurdles for Commercializing
Dr. Sohn Sang Hyun | Principal Engineer R&D Team, Visual Display Divisions of Samsung Electronics
The Cd-free Quantum dot-enhancement film (QDEF) developed by Samsung electronics has been successfully commercialized in the TV market attributed to both high stabilities of QD film against temperature and humidity and cost-effective production. The unique nature of QD materials has made QLED TV very competitive because of their excellent photoluminescence efficiency and color purity. In 2019, a comprehensive supply chain from QD synthesis to barrier film of Samsung has been very successful and able to produce more than 5 million TV sets.
This presentation will briefly mention the technical roadmap about development of next QLED TV. Especially, the recent progress of quantum dot light emitting diodes (QD-LED) will be highlighted. To make QLED display more strongly positioned, there are still many technical hurdles to be overcome. We would like to discuss these technical issues related to QLED display with experts in this field.
Status and Outlook for QD-photoresist Applications in the Display Industry
Ryu Takeko | Mgr. of Planning & Coordination Office, It-related Chemicals Sector of Sumitomo Chemical
QD-color filter is a promising material that delivers wide color gamut and wide view angle to future display. We’ve been developing QD-photoresist that is able to form patterned QD-color filter utilizing our color-photoresist technology. This presentation will discuss recent progress in QD-photoresist and its application in the display industry.
Yeon Sik Jung | Associate Professor of KAIST
8:30 QD- BCP Hybrids This talk introduces how the photoluminescence (PL) of QD composite films can be enhanced through an assembly of QDs and a block copolymer (BCP). A BCP matrix casted under controlled humidity provides multi-scale phase-separation features based on (1) sub-μm-scale spinodal decomposition between polymer-rich and water-rich phases and (2) sub-10-nm-scale microphase separation between polymer blocks. The BCP-QD composite induces significant enhancement of both light absorption and extraction efficiencies via effective random light scattering, collectively achieving 21-fold enhanced PL over a broad spectral range.
Networking Break & Coffee
Quantum Dots For Color Conversion Applications
Dr. Ravi Tangirala | R&D Program Manager of Nanosys Inc.
Quantum dot color conversion (QDCC) technology, in which traditional color filters are replaced by patterned subpixels containing green or red QDs, will lead to displays with higher brightness, color tunability and viewing angles. QDCC layers can be applied to any display containing a blue light source, including LCDs, OLEDs and micro-LEDs, and fabricated using inkjet printing or photolithography, depending on the feature size requirement. Nanosys has developed specially designed Cd-free QDs with enhanced blue absorption and green/red emission for use in color conversion. We will discuss these design criteria, as well as the strategies used for compatibilizing the QDs with inks or photoresists used for deposition.
QLEDs for Photomedical Applications
Yajie Dong, Ph. D. | Founder and Chief Scientific Officer of QLEDCures LLC
Quantum dot light emitting diodes (QLEDs) with outstanding wavelength tunability, ideal color purity, sufficient power density and unique flexible form factors are high promising photomedical light sources that could facilitate widespread clinical applications of photodynamic therapy (PDT) or photobiomodulations (PBM). In this talk, I will share the progresses on flexible QLEDs development and photomedical in-vitro studies at QLEDCures, University of Central Florida and our medical partner institutions. The perspective of flexible QLEDs for various photomedical applications in the near and long term will also be discussed.
Presentation To Be Confirmed
Both conference tracks will eat lunch together
This session will deep-dive into the latest phosphors innovations in academia and industry.
Far Red Phosphors for Horticulture LED Systems
William Beers, Ph.D. | Principal Engineer - Phosphors of GE Current
The far-red (FR) region (700 nm-740 nm) of the electromagnetic spectrum has significant implication for plant growth and development. Exposure to red light regulates processes ranging from seed germination, height, leaf expansion, branching, plant immunity, circadian rhythm, leaf chlorophyll concentration to freezing tolerance. Additionally, FR light plays a role in photosynthesis. In this talk we will discuss research undertaken to develop phosphor converted far-red LEDs for horticultural lighting. In particular, the FR luminescence from transition metal and rare earth ions in oxide and fluoride lattices that are excitable by the blue light from the LED device is emphasized.
Development of Yellow/Orange Nitride Phosphors for High-Power Excitation
Dr. Shiho Takashina | Senior Manager of Mitsubishi Chemical Corporation
Lights under high power excitation is collecting a lot of attention in solid state lighting fields lately. Applications under blue laser excitation instead of LED are being developed actively. Phosphors which can be used under blue laser excitation are limited due to their saturation and thermal quenching issues. Orange and red phosphors suitable for such an application are needed. We succeeded in widening emission color of La3Si6N11:Ce between yellow and orange with superior saturation and thermal quenching properties. We will report this phosphor and our recent activities.
Single Crystal Phosphor Based Components and Applications
Jan Kubat, Ph.D. | Product Line Manager of CRYTUR
Solution with single crystal as an excellent phosphor with internal quantum efficiency over 95% up to 250°C, high thermal conductivity (~10 W/m.K) and luminescence thermal quenching over 200°C provides new opportunities for a components and design of high power lighting applications. But even employing highly efficient monocrystalline phosphor with multiple high power laser diodes can lead to overheating and then thermal management become crucial. We have optimized solutions based on principles of metal contact which assures the most efficient connection of the phosphor to the copper heat sink to deal with the heat. Unique single crystal phosphor based applications and will be introduced.
Networking Break & Coffee
Both conference tracks will break together
Group VI Metalates as Thermosensitive Phosphors
Prof. Federico Rabuffetti | Assistant Professor of Chemistry of Wayne State University
Group VI metal oxides featuring MoO4–2 and WO4–2 anions are ideal host materials for thermosensitive phosphors activated by Mn4+ or rare-earth metals. A distinct feature of these materials is their structural diversity in terms of metal coordination and connectivity, which makes them an ideal platform to exercise compositional control of their temperature-dependent luminescence response. In this talk, I will highlight the potential of molybdate and tungstate phosphors as luminescent thermometers. I will show that selected Mn4+-activated metalates serve as bandshift thermometers with a temperature sensitivity comparable to that of quantum dots but with a much broader usable temperature range.
Broadband Near-Infrared Phosphors with High Radiant Flux as Future Light Sources for LED
Professor Ru-Shi Liu | Professor, Department of Chemistry of National Taiwan University
The near-infrared (NIR) light source is desirable for real-time non-destructive examination applications, which include the analysis of foodstuffs, health monitoring, iris recognition, and infrared cameras. The light emission spectra of such infrared light sources should also be broad as possible for effective performance, in view of the broad absorption and reflection of light by the organic elements present in foodstuffs and human health in the blue and NIR regions of the electromagnetic spectrum, respectively. In this report, a blue light-emitting diode (LED) excitable broad-band NIR phosphor light source is developed.
Presentation To Be Confirmed
Both conference tracks will eat lunch together
This closing session will bring all delegates back together to explore and highlight the novel and emerging uses of phosphors and quantum dots in several different applications. Presentations from both academia and industry will provide an in-depth look at new technologies and applications being explored by both the phosphor and QD communities - and what is potentially going commercial next.
Towards the Optimum Single Ion Luminescence Thermometer – An Account for Simple and Quantitative Guidelines
Dr. Markus Suta | Postdoctoral Researcher of Utrecht University
Despite the quickly emerging importance of luminescence nanothermometry for, e.g. catalysis or especially bio-applications to remotely measure temperatures, a general and widely applicable theoretical framework is still lacking. Not only would this save the effort to find new suited nanothermometers by a trial-and-error strategy and lots of optimization, but even clarify what the appropriate conditions relevant for the achievable temperature precision are in order to use a certain nanothermometer. In this contribution, an introduction for a generalized model for luminescence thermometers working with dopant ions such as transition metal or lanthanide ions will be presented. The emphasis will lie on the simple quantitative guidelines following from the fundamental properties of the Boltzmann distribution as the governing temperature calibration law. Moreover, the boundary conditions for the validity and failure of that calibration law will be addressed. Finally, it will also be demonstrated that the predicted thermometry performances of potential candidates are indeed experimentally realized.
Interparticle Energy Transfer: A Novel Toolbox for Spectral Design
Dr. Anne Berends | Materials Scientist of Seaborough Research
Line emitters (FWHM <5 meV) have an enormous potential for use in LEDs, because they allow both improvement of color rendering while maintaining high lm/W for white LEDs. However, conventional line emitters (i.e. trivalent lanthanide doped phosphors) lack absorption in the blue spectral region, thus limiting their use as color converters on blue LEDs. This bottleneck can be overcome by our nanoscale engineering approach, based on inter particle energy transfer. Making use of inter particle energy transfer allows tuning of absorption and emission wavelengths over a wide range of the spectrum. When the initial challenge of preparing high quality nanoparticles has been overcome, the nanoscale brings in various additional advantages, such as solution processability and a gamut of material treatment possibilities borrowed from the well developed field of semiconductor quantum dots. This talk will discuss the relevant energy transfer process in more detail and provide experimental evidence for this new sensitization mechanism paving the road towards blue excitable line emitters.
Photovoltaic Form Factors for Quantum Dot Luminescent Solar Concentrators
David Needell | PhD Researcher in Solar PV of Caltech
With over 50 years of research and development, luminescent solar concentrator (LSC) designs for photovoltaic (PV) applications continues to progress toward a commercially realizable technology. With the advent of the quantum dot (QD) for LSCs in the late 20th century, unprecedented levels of light trapping and harvesting for LSCs at the lab scale have shown promise for sunlight-harvesting applications. However, despite accomplishments in these small-scale devices, a performance-scalable LSC device for solar energy conversion remains an enormous and unanswered challenge. Here we examine several form factors for LSCs to enable both high light to electrical power efficiency as well as device-size scalability.
Synthesis of YAG- and RE fluoride-based Nanophosphors and Their Incorporation in 3D Composite Structures for Optical Applications by Self-assembly Process
Yige Yan | PostDoctoral Reseracher at University of Lyon
Hybrid materials are intensively investigated for optical applications (bioimaging, sensors, filters, photocatalysis…) . Nanoparticles of oxides or fluorides can be used as prepared or incorporated in 2D/3D materials for the final application, using either self-assembly process or included in transparent matrices. The presentation will first study the synthesis of rare earth element doped YAG nanophosphor by glycothermal approach. Influence of some key synthesis parameters on the resulted morphology differences of nanophosphors will be discussed . Then rare earth fluorides or metal oxides self-assembled to build 2D or 3D structures and heterostructures will be further demonstrated [3,4,5]. Controlled destabilization of stable colloidal suspension was used to prepare oxides (YAG), fluorides (Rare Earth) crystalline xerogels and aerogels and mixed-composite with controlled porosity, mechanical resistance and optical properties . This offers a wide possibility of compositions of materials for applications in energy storage, catalysis, photocatalysis, optics, sensors.
Panel: Open Discussion with the 2020 Advisory Board
- Future Outlook and Perceptions
- Industry Call to Action
- Vision for 2021 Meeting
Participating Board Members Include:
Dr. Charlie Hotz, Vice President of R&D, Nanosys Inc
Hunter McDaniel, Ph.D., Founder and CEO, UbiQD, LLC
Dr. Mike Krames, President & Owner, Arkesso LLC
Dr. Eric Virey, Senior Market & Technology Analyst, Yole Développement
Closing Remarks for 2020
Poster Session Winner Announced
More details on this year's poster session will be available soon!