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：

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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。