Lai Chun-Feng, Chang Yu-Ching, Huang Yu-Shan
Department of Photonics, Feng Chia University, Taichung 407, Taiwan.
Nanomaterials (Basel). 2022 May 4;12(9):1554. doi: 10.3390/nano12091554.
Environmentally friendly quantum dots (QDs) of InP-based materials are widely investigated, but their reliability remains inadequate to realize their full potential and wide application. In this study, InP/ZnSeS/ZnS QDs (pristine QDs) were dispersed and embedded into Santa Barbara Amorphous-15 mesoporous particles (SBA-15 MPs) for the first time. A solvent-free method for preparing QD white light-emitting diodes (WLEDs) that is compatible with the WLED packaging process was developed. The photoluminescence (PL) spectrum of pristine QD powder exhibited cluster states and had huge redshift of approximately 23 nm. By comparison, the PL spectrum of the SBA-15 MP/QD hybrid powder had a slight redshift of approximately 8 nm, only because the pristine QDs were dispersed and embedded well in the SBA-15 MPs. The PL intensity of the SBA-15 MP/QD hybrid powder slightly decreased after heating and cooling compared with that of the pristine QDs. Moreover, the luminous efficacy of the SBA-15 MP/QD hybrid WLEDs was enhanced by approximately 14% compared with that of the pristine QD-WLEDs. Furthermore, reliability analysis revealed that the SBA-15 MPs could improve the stability of the pristine QDs on chips. Thus, these MPs promise good potential for applications in mini-LEDs in the future.
基于InP的环保型量子点（QDs）受到了广泛研究，但其可靠性仍不足以充分发挥其潜力并实现广泛应用。在本研究中，首次将InP/ZnSeS/ZnS量子点（原始量子点）分散并嵌入到圣巴巴拉无定形-15介孔颗粒（SBA-15 MPs）中。开发了一种与白光发光二极管（WLED）封装工艺兼容的无溶剂制备量子点白光发光二极管的方法。原始量子点粉末的光致发光（PL）光谱呈现出聚集态，并且有大约23 nm的巨大红移。相比之下，SBA-15 MP/量子点混合粉末的PL光谱只有大约8 nm的轻微红移，这仅仅是因为原始量子点在SBA-15 MPs中分散和嵌入良好。与原始量子点相比，SBA-15 MP/量子点混合粉末在加热和冷却后的PL强度略有下降。此外，SBA-15 MP/量子点混合白光发光二极管的发光效率比原始量子点白光发光二极管提高了约14%。此外，可靠性分析表明，SBA-15 MPs可以提高原始量子点在芯片上的稳定性。因此，这些介孔颗粒在未来的微型发光二极管应用中具有良好的潜力。
