CuInS₂ core nanocrystals (NCs) with different Cu/In ratios are synthesized, and a rapid synthesis method is used to overcoat ZnS shells onto them. A time-resolved photoluminescence study revealed that a broad PL peak consists of the contribution from two kinds of donor–acceptor pairs (DAPs), and as indicated by photo-stability measurements, higher energy DAPs are sensitive to irradiation, resulting in the photo-instability of CuInS₂ NCs. The intensity ratio between high-energy DAPs and low-energy ones is decreased with the decrease of the Cu/In ratio, and it is suggested that the high energy DAPs are near the core/shell interfaces, and the low energy ones are inside the cores. The shell's overcoating, which would keep the higher energy DAPs away from the surroundings, could improve the photo-stability of the NCs.

中文翻译：

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Cu / In比和壳厚对CuInS ₂ / ZnS纳米晶体光稳定性的影响

合成了具有不同Cu / In比的CuInS ₂核纳米晶体（NCs），并使用快速合成方法将ZnS壳包覆在其上。一项时间分辨的光致发光研究表明，宽的PL峰由两种供体-受体对（DAP）贡献，并且如光稳定性测量所示，较高能量的DAP对辐照敏感，从而导致光致发光。 CuInS _2的不稳定性NCs。随着Cu / In比的降低，高能DAP和低能DAP之间的强度比降低，这表明高能DAPs靠近核/壳界面，而低能DAPs位于核/壳界面附近。核心。外壳的外涂层可以使高能量的DAP远离周围环境，从而可以改善NC的光稳定性。