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Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss
ACS Nano ( IF 15.8 ) Pub Date : 2020-12-23 , DOI: 10.1021/acsnano.0c05735
Jia-Sheng Li, Yong Tang, Zong-Tao Li, Jie-Xin Li, Xin-Rui Ding, Bin-Hai Yu, Shu-Dong Yu, Jian-Zhen Ou, Hao-Chung Kuo

In this study, we analyze the influence of the pore structure of an SBA-15 particle on the light emission from its inner adsorbed quantum dots (QDs) and outer light-emitting diode (LED) chips. It is found that the particle features of a high refractive index, comparable feature size of pore structure, and lower amount of QD adsorption help with QD light extraction, demonstrating a mechanism to suppress QD light propagating through pores and thus reducing the reabsorption loss. We consequently developed highly efficient QD white LEDs with wet-mixing QD/SBA-15 nanocomposite particles (NPs) by further optimizing the packaging methods and the introduced NP mass ratio. The LEDs demonstrated a record luminous efficacy (the ratio of luminous flux to electrical power) of 206.8 (entrusted test efficiency of 205.8 lm W–1 certificated by China National Accreditation Service) and 137.6 lm W–1 at 20 mA for white LEDs integrating only green QDs and green–red QD color convertors, respectively, with improved operating stability. These results are comparable to conventional phosphor-based white LEDs, which can be a starting point for white LEDs only using QDs as convertors toward commercialization in the near future.

中文翻译:

通过减少重吸收损耗,使每瓦量子点白光发光二极管达到200流明

在这项研究中,我们分析了SBA-15颗粒的孔结构对其内部吸附的量子点(QD)和外部发光二极管(LED)芯片发出的光的影响。发现具有高折射率的颗粒特征,可比较的孔结构特征尺寸和较低的QD吸附量有助于QD光提取,证明了抑制QD光通过孔传播并因此减少了重吸收损失的机理。因此,我们通过进一步优化封装方法和引入的NP质量比,开发了具有湿混QD / SBA-15纳米复合颗粒(NP)的高效QD白光LED。LED的发光效率(光通量与电功率之比)达到了创纪录的206.8(受委托的测试效率为205.8 lm W –1)白光LED分别集成了绿色QD和绿色-红色QD色彩转换器,并具有207.6 mA的137.6 lm W –1在20 mA电流时具有更高的工作稳定性。这些结果可与传统的基于磷光体的白光LED相媲美,后者可以作为仅在不久的将来使用QD作为转换器实现商业化的白光LED的起点。
更新日期:2021-01-26
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