高效蜡烛光有机发光二极管，具有极低的色温。

Highly Efficient Candlelight Organic Light-Emitting Diode with a Very Low Color Temperature.

机构信息

Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30044, Taiwan.

Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania.

出版信息

Molecules. 2021 Dec 13;26(24):7558. doi: 10.3390/molecules26247558.

DOI:10.3390/molecules26247558

PMID:34946643

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8707034/

Abstract

Low color temperature candlelight organic light-emitting diodes (LEDs) are human and environmentally friendly because of the absence of blue emission that might suppress at night the secretion of melatonin and damage retina upon long exposure. Herein, we demonstrated a lighting device incorporating a phenoxazine-based host material, 3,3-bis(phenoxazin-10-ylmethyl)oxetane (BPMO), with the use of orange-red and yellow phosphorescent dyes to mimic candlelight. The resultant BPMO-based simple structured candlelight organic LED device permitted a maximum exposure limit of 57,700 s, much longer than did a candle (2750 s) or an incandescent bulb (1100 s) at 100 lx. The resulting device showed a color temperature of 1690 K, which is significantly much lower than that of oil lamps (1800 K), candles (1900 K), or incandescent bulbs (2500 K). The device showed a melatonin suppression sensitivity of 1.33%, upon exposure for 1.5 h at night, which is 66% and 88% less than the candle and incandescent bulb, respectively. Its maximum power efficacy is 23.1 lm/W, current efficacy 22.4 cd/A, and external quantum efficiency 10.2%, all much higher than the CBP-based devices. These results encourage a scalable synthesis of novel host materials to design and manufacture high-efficiency candlelight organic LEDs.

摘要

低色温的烛光有机发光二极管（OLED）由于不含可能会在夜间抑制褪黑素分泌并在长时间暴露后损害视网膜的蓝光发射，因此对人类和环境都是友好的。在此，我们展示了一种照明设备，该设备采用了苯并噁嗪为主体材料的 3,3-双（苯并噁嗪-10-基甲基）氧杂环丁烷（BPMO），并使用橙红色和黄色磷光染料来模拟烛光。所得的基于 BPMO 的简单结构烛光有机 LED 器件允许的最大暴露极限为 57,700 s，比蜡烛（2750 s）或白炽灯泡（1100 s）在 100 lx 下的时间长得多。由此产生的设备显示出 1690 K 的色温，明显低于油灯（1800 K）、蜡烛（1900 K）或白炽灯泡（2500 K）的色温。该设备在夜间暴露 1.5 小时后，褪黑素抑制灵敏度为 1.33%，分别比蜡烛和白炽灯泡低 66%和 88%。其最大功率效率为 23.1 lm/W，电流效率为 22.4 cd/A，外量子效率为 10.2%，均高于基于 CBP 的器件。这些结果鼓励大规模合成新型主体材料，以设计和制造高效的烛光有机 LED。