High luminous flux from single crystal phosphor-converted laser-based white lighting system
High luminous flux from single crystal phosphor-converted laser-based white lighting system
复制标题
DOI：
10.1364/oe.24.00a215
复制
发表时间：
2016-01-25
期刊：
影响因子：
3.8
通讯作者：
DenBaars, Steven P.
中科院分区：
文献类型：
--
作者：
Cantore, Michael;Pfaff, Nathan;DenBaars, Steven P.
随着电流密度的增加，发光二极管（LED）的效率下降限制了每晶片面积发射的光量。由于高效率操作需要低电流密度，因此高功率白色光照明系统需要许多LED管芯。相比之下，激光二极管（LD）的载流子密度在阈值处箝位，因此LD的效率不会下降到阈值以上，并且可以在非常高的电流密度下实现高效率。研究了高功率GaN基蓝光LD与单晶掺铈钇铝石榴石（YAG：Ce）样品的耦合用于白色光照明应用。在CW操作下，单个磷光体转换的LD（pcLD）管芯在1.4A和4.24V下产生86.7lm/W的峰值发光效率，并且在3.0A和4.85V下产生1100 lm的峰值光通量，发光效率为75.6lm/W。一个pc-LD的模拟证实，单晶YAG：Ce样品没有经历在峰值LD工作效率的热淬火。这些结果表明，单个pc-LD管芯能够发射足够的光通量用于高功率白色光照明系统。(C)2015美国光学学会
The efficiency droop of light emitting diodes (LEDs) with increasing current density limits the amount of light emitted per wafer area. Since low current densities are required for high efficiency operation, many LED die are needed for high power white light illumination systems. In contrast, the carrier density of laser diodes (LDs) clamps at threshold, so the efficiency of LDs does not droop above threshold and high efficiencies can be achieved at very high current densities. The use of a high power blue GaN-based LD coupled with a single crystal Ce-doped yttrium aluminum garnet (YAG: Ce) sample was investigated for white light illumination applications. Under CW operation, a single phosphor-converted LD (pcLD) die produced a peak luminous efficacy of 86.7 lm/W at 1.4 A and 4.24 V and a peak luminous flux of 1100 lm at 3.0 A and 4.85 V with a luminous efficacy of 75.6 lm/W. Simulations of a pc-LD confirm that the single crystal YAG: Ce sample did not experience thermal quenching at peak LD operating efficiency. These results show that a single pc-LD die is capable of emitting enough luminous flux for use in a high power white light illumination system. (C) 2015 Optical Society of America