Open AccessDevelopment of UV-LED Phosphor Coatings for High Efficiency Solid State Lighting
Author(s) -
U. Happek
Publication year - 2005
Language(s) - English
Resource type - Reports
DOI - 10.2172/921274
Subject(s) - phosphor , light emitting diode , quenching (fluorescence) , materials science , optoelectronics , solid state , white light , solid state lighting , environmental science , optics , engineering physics , physics , fluorescence
The University of Georgia, in collaboration with GE Global Research, is investigating the relevant quenching mechanism of phosphor coatings used in white light devices based on UV LEDs in a focused eighteen month program. The final goal is the design of high-efficacy white UV-LEDs through improved and optimized phosphor coatings. At the end of the first year, we have reached a fundamental understanding of quenching processes in UV-LED phosphors and have observed severe quenching in standard devices under extreme operating conditions. Relationships are being established that describe the performance of the phosphor as a function of photon flux, temperature, and phosphor composition. These relationships will provide a road map for the design of efficient white light LEDs during the final six months of the project