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 polydimethylsiloxane 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.

中文翻译：

---

具有高发光效率的量子点白光LED

由于高量子产率（QY）和通过量子限制效应和材料组成可调节的电子特性，胶体量子点（QD）在过去的三十年中引起了人们的极大关注。然而，由于从液态的合成批料到固态的主体基质的QY降低，将其用于有效的固态光源仍然是一个挑战，这也被称为主体材料效应。在这里，我们通过在发光二极管（LED）中进行简单的液态集成来抑制主体材料效应，从而导致基于红，绿，蓝（RGB）的发光效率分别为64 lm / W和105 lm / W。基于绿色，蓝色（GB）的白光生成。为了那个原因，我们通过优化合成参数并以液体形式的蓝色LED裸片以适当的注入量集成了高达84％的QY的高效QD，从而最大程度地提高了发射红色和绿色QD的QY，以实现高效白光照明。与将QD引入聚二甲基硅氧烷薄膜和密堆积形式相比，液相整合显示出效率分别提高了2倍和6倍。我们的理论计算预测，液体QD-LED的发光效率可以达到200 lm / W以上。因此，本研究为超高效QD照明铺平了道路。与将QD引入聚二甲基硅氧烷薄膜和密堆积形式相比，液相整合显示出效率分别提高了2倍和6倍。我们的理论计算预测，液体QD-LED的发光效率可以达到200 lm / W以上。因此，本研究为超高效QD照明铺平了道路。与将QD引入聚二甲基硅氧烷薄膜和密堆积形式相比，液相整合显示出效率分别提高了2倍和6倍。我们的理论计算预测，液体QD-LED的发光效率可以达到200 lm / W以上。因此，本研究为超高效QD照明铺平了道路。