ABSTRACT

In recent years, perovskite quantum dots (QDs) have become a new class of semiconductor materials due to their high monodispersity and adjustable emission spectra. However, there are few studies on perovskite QDs ligands, and there are some problems such as poor stability and low photoluminescence quantum yield (PLQY). Here, we prepared CsPbBr₃ QDs with excellent optical properties and crystallinity by using caesium stearate as the precursor. Besides, we systematically studied the effects of different chain length organic amines on the yield, optical properties and stability of CsPbBr₃ QDs. The experimental results show that the long-chain organic amin oleylamine and dodecylamine (DOAm) have better encapsulation properties, and the synthesised QDs have better crystallinity and stability. CsPbBr₃ QDs with PLQY of 90%were obtained by using oleic acid (OA)/DOAm as a ligand at 140°C. Moreover, a high purity monochrome quantum dot light-emitting diode was prepared.

摘要

近年来，钙钛矿量子点（QDs）由于其高单分散性和可调发射光谱而成为一类新型半导体材料。然而，钙钛矿量子点配体的研究较少，存在稳定性差、光致发光量子产率（PLQY）低等问题。在这里，我们通过使用硬脂酸铯作为前驱体制备了具有优异光学性能和结晶度的CsPbBr ₃  QD。此外，我们系统地研究了不同链长有机胺对CsPbBr ₃产率、光学性质和稳定性的影响。 量子点。实验结果表明，长链有机胺油胺和十二烷基胺（DOAm）具有更好的包封性能，合成的量子点具有更好的结晶度和稳定性。 通过使用油酸 (OA)/DOAm 作为配体，在 140°C 下获得了 PLQY 为 90% 的CsPbBr ₃ QD。此外，制备高纯度单色量子点发光二极管。