期刊
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
卷 44, 期 20-23, 页码 L649-L651出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.L649
关键词
light-emitting diodes; GaN; diffuse reflector; encapsulant; phosphor
Enhancement of phosphor efficiency is reported for GaInN-based white light-emitting diodes (LEDs) employing a large separation between the primary LED emitter and the wavelength converter, and a diffuse reflector cup. Ray-tracing simulations show that extraction efficiency of wavelength-converted light is enhanced by 75%. The experimental improvement in phosphor efficiency of blue-pumped yellow phosphor is 15.4% compared with conventional phosphor-based white LEDs. The improvement is attributed to reduced re-absorption of wavelength-converted light by the LED chip.
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