Quantum dot white LEDs with high luminous efficiency
Quantum dot white LEDs with high luminous efficiency
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DOI：
10.1364/optica.5.000793
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发表时间：
2018-07-20
期刊：
影响因子：
10.4
通讯作者：
Nizamoglu, Sedat
中科院分区：
文献类型：
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作者：
Sadeghi, Sadra;Kumar, Baskaran Ganesh;Nizamoglu, Sedat
胶体量子点（QD）由于其高量子产率（QY）以及通过量子限制效应和材料成分可调节的电子特性，在过去三十年中引起了极大的关注。然而，由于从液态合成批次到固态基质基质的 QY 降低（也称为基质材料效应），将它们用于高效固态光源仍然是一个挑战。在这里，我们通过发光二极管 (LED) 中的简单液态集成来抑制主体材料效应，使得基于红、绿、蓝 (RGB) 的发光效率为 64 lm/W，基于绿、蓝 (GB) 的白光生成为 105 lm/W。为此，我们通过优化合成参数，以适当的注入量在液体形式的蓝色 LED 芯片上集成 QD，QY 高达 84%，从而最大限度地提高红光和绿光发射 QD 的 QY，以实现高效白光照明。与在聚二甲基硅氧烷薄膜中掺入量子点和密堆积形成相比，液态集成的效率分别提高了两倍和六倍。我们的理论计算预测液态QD-LED的发光效率可以达到200 lm/W以上。因此，这项研究为基于量子点的超高效率照明铺平了道路。 (C)2018 年美国光学协会根据 OSA 开放获取出版协议的条款
Colloidal quantum dots (QDs) have attracted significant attention in the last three decades due to high quantum yield (QY) and tunable electronic properties via quantum confinement effect and material composition. However, their utilization for efficient solid-state lighting sources has remained a challenge due to the decrease of QY from the synthesis batch in the liquid state to the host matrix in the solid state, which is also known as the host material effect. Here, we suppress the host material effect by simple liquid-state integration in light-emitting diodes (LEDs) that lead to a luminous efficiency of 64 lm/W for red, green, blue (RGB)-based and 105 lm/W for green, blue (GB)-based white light generation. For that, we maximized the QY of red- and green-emitting QDs by optimizing synthesis parameters and integrated efficient QDs with QY up to 84% on blue LED dies in liquid form at appropriate injection amounts for high-efficiency white lighting. Liquid-state integration showed two-fold and six-fold enhancement of efficiency in comparison with incorporation of QDs in polydixnethylsiloxane film and close-packed formation, respectively. Our theoretical calculations predicted that the luminous efficiency of liquid QD-LEDs can reach over 200 lm/W. Therefore, this study paves the way toward ultra-high-efficiency QD-based lighting. (C)2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement