Zhong Ping, He Guoxing, Zhang Minhao
Department of Applied Physics, Dong Hua University, 1882 Yan’an Road (W), Shanghai 200051, China.
Opt Express. 2012 Apr 9;20(8):9122-34. doi: 10.1364/OE.20.009122.
The relationship and trade-offs between the performance parameters including color rendering index (CRI), luminous efficacy of radiation (LER) and correlated color temperature (CCT) of white LEDs using quantum dot nanophosphors (QD-WLEDs) are investigated for CRI ≥ 80 and LER ≥ 300 lm/W at 1500 K ≤ CCT ≤ 6500 K. The optimal spectra of QD-WLEDs with CCTs of 2700-6500 K have been obtained with a nonlinear program for maximizing LER under conditions of both CRI and a special CRI of R9 strong red above 90 or 95. Furthermore, high performance QD-WLEDs with LER = 381 lm/W for CRI = R9 = 90 and LER = 371 lm/W for CRI = R9 = 95 at CCT = 3000 K, with LER = 361 lm/W for CRI = R9 = 90 and LER = 352 lm/W for CRI = R9 = 95 at CCT = 4500 K, and with LER = 346 lm/W for CRI = R9 = 90 and LER = 338 lm/W for CRI = R9 = 95 at CCT = 5700 K could be achieved. The LERs of high performance white LEDs using QD nanophosphors increase by 13% to 32% compared with that of white LEDs using traditional phosphors.
对于量子点纳米磷光体白光发光二极管（QD-WLEDs），在显色指数（CRI）≥80、辐射发光效率（LER）≥300 lm/W且相关色温（CCT）在1500 K≤CCT≤6500 K的条件下，研究了包括CRI、LER和CCT在内的性能参数之间的关系和权衡。通过非线性程序，在CRI以及R9强红色特殊显色指数高于90或95的条件下，获得了CCT为2700 - 6500 K的QD-WLEDs的最佳光谱。此外，在CCT = 3000 K时，可实现CRI = R9 = 90且LER = 381 lm/W以及CRI = R9 = 95且LER = 371 lm/W的高性能QD-WLEDs；在CCT = 4500 K时，可实现CRI = R9 = 90且LER = 361 lm/W以及CRI = R9 = 95且LER = 352 lm/W的高性能QD-WLEDs；在CCT = 5700 K时，可实现CRI = R9 = 90且LER = 346 lm/W以及CRI = R9 = 95且LER = 338 lm/W的高性能QD-WLEDs。与使用传统磷光体的白光发光二极管相比，使用QD纳米磷光体的高性能白光发光二极管的LER提高了13%至32%。
