All-inorganic CsPbX₃ (X = I, Br, Cl) perovskite nanocrystals have emerged as a new class of optoelectronic material with tunable emission wavelengths, narrow full-width at half-maximum (FWHM) and high photoluminescence quantum yields (PLQYs) (≥50% in general). However, the instability caused by high delocalization of surface ions is still the major issue that obstructs their application. The type of surface ligands plays a key role in the stability of perovskite nanocrystals. In this work, stable cubic Br-rich CsPbBr₃ quantum dots (QDs) with uniform particle sizes, high quantum yields and high crystallinity were obtained by a one-step hot-injection synthesis method. Oleylamine (OM) as one of the ligands in the classic synthesis method was replaced with (3-aminopropyl)triethoxysilane (APTES). The stability of the CsPbBr₃ QDs was significantly improved under different testing conditions.

中文翻译：

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具有高荧光量子产率的 稳定CsPbBr ₃钙钛矿量子点†

全无机CsPbX ₃（X = I，Br，Cl）钙钛矿纳米晶体已成为一种新型的光电材料，具有可调节的发射波长，半峰全宽（FWHM）窄且光致发光量子产率（PLQYs）（一般≥50％）。但是，由于表面离子高度离域而引起的不稳定性仍然是阻碍其应用的主要问题。表面配体的类型在钙钛矿纳米晶体的稳定性中起关键作用。在这项工作中，稳定的立方晶富含溴的CsPbBr ₃通过一步热注入合成法获得了粒径均匀，量子产率高，结晶度高的量子点。在经典合成方法中作为配体之一的奥来拉明（OM）被（3-氨丙基）三乙氧基硅烷（APTES）取代。在不同的测试条件下，CsPbBr ₃ QD的稳定性得到了显着提高。