Analysis of lasers as a solution to efficiency droop in solid-state lighting
Analysis of lasers as a solution to efficiency droop in solid-state lighting
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DOI：
10.1063/1.4932582
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发表时间：
2015-10-05
影响因子：
4
通讯作者：
Crawford, M. H.
中科院分区：
文献类型：
--
作者：
Chow, W. W.;Crawford, M. H.
这封信分析了通过用激光器取代InGaN发光二极管（LED）来减轻固态发光体效率下降的建议。赞成这种方法的论点是，在激光发射开始后的载流子数箝位将载流子损耗限制在阈值，而受激发射继续随着注入电流而增长。适用于LED和激光器（高于和低于阈值）的完全量化（载流子和光）理论用于获得定量评估。结果证实了激光阈值以上的更高的激光输出功率和效率的潜在优势，同时也表明缺点，包括低效率的激光开始之前，激光阈值对温度的敏感性，和灾难性的激光故障的影响。其中一些问题的解决方案，建议利用纳米激光器的最新发展。(C)2015 AIP Publishing LLC.
This letter analyzes the proposal to mitigate the efficiency droop in solid-state light emitters by replacing InGaN light-emitting diodes (LEDs) with lasers. The argument in favor of this approach is that carrier-population clamping after the onset of lasing limits carrier loss to that at threshold, while stimulated emission continues to grow with injection current. A fully quantized (carriers and light) theory that is applicable to LEDs and lasers (above and below threshold) is used to obtain a quantitative evaluation. The results confirm the potential advantage of higher laser output power and efficiency above lasing threshold, while also indicating disadvantages including low efficiency prior to lasing onset, sensitivity of lasing threshold to temperature, and the effects of catastrophic laser failure. A solution to some of these concerns is suggested that takes advantage of recent developments in nanolasers. (C) 2015 AIP Publishing LLC.