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Meeting Materials Science & Technology 2020
Symposium Ceramic and Crystal Materials for Optics and Photonics
Presentation Title Plate/Powder Form of Single Crystal Phosphors for High-brightness White Lighting
Author(s) Kiyoshi Shimamura, Encarnacion Garcia Villora, Daisuke Inomata
On-Site Speaker (Planned) Kiyoshi Shimamura
Abstract Scope Single-crystal phosphors (SCPs), which exhibit a superior conversion efficiency, a high thermal stability and a low temperature increase under high-power irradiation, are proposed for high brightness (HB) white lighting applications. SCPs possess a high purity and crystalline quality, thus guarantying best performance in either bulk or powder form. The best yellow phosphor for white LEDs is Ce:YAG, and its emission can be tuned towards the green by Lu substitution. SCPs exhibit an outstanding internal quantum efficiency (QE); at room temperature it’s over 95%, and with the temperature rise it increases even further, reaching a maximum at about 250oC. Instead, the internal QE of CPPs even quenches at much lower temperatures, indicating the presence of undesired non-radiative recombination paths. These show that, SCPs meet the fundamental requirements for emerging HB applications such as laser headlights and laser projectors. Binder-free SCP powder plate is demonstrated, and it has shown the same performance.


Fabrication and Optical Properties of Yb-doped MgO Transparent Ceramics by Spark Plasma Sintering
Giant Micro-photonics toward Table-top XFEL
Investigation Into Improving Scintillation Properties of Cesium Hafnium Chloride
Manipulating Properties via Grain Size Engineering in Transparent Ceramics
Microstructural Evolution and Cantilever Bending of AlON Transparent Ceramics
Nano-phosphor Materials Synthesized by Novel Soft Chemistry, Water-assisted Solid-state Reaction Method
Plate/Powder Form of Single Crystal Phosphors for High-brightness White Lighting
Self Activated Ca3Si2O7 + Ca2SiO4:Dy3+ Phosphors Derived from Agro-food Wastes
ZnS:Ag Scintillators: Synthesis, Microstructure, and Luminescence

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