Meng Wen, Wang Chuying, Xu Guangyong, Luo Guigen, Deng Zhengtao
State Key Laboratory of Analytical Chemistry for Life Science, National Laboratory of Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, China.
Molecules. 2024 Mar 5;29(5):1162. doi: 10.3390/molecules29051162.
All-inorganic cesium copper halide nanocrystals have attracted extensive attention due to their cost-effectiveness, low toxicity, and rich luminescence properties. However, controlling the synthesis of these nanocrystals to achieve a precise composition and high luminous efficiency remains a challenge that limits their future application. Herein, we report the effect of oleylammonium iodide on the synthesis of copper halide nanocrystals to control the composition and phase and modulate their photoluminescence (PL) quantum yields (QYs). For CsCuI, the PL peak is centered at 560 nm with a PLQY of 47.3%, while the PL peak of CsCuI is located at 440 nm with an unprecedently high PLQY of 95.3%. Furthermore, the intermediate-state CsCuI/CsCuI heterostructure shows white light emission with a PLQY of 66.4%, chromaticity coordinates of (0.3176, 0.3306), a high color rendering index (CRI) of 90, and a correlated color temperature (CCT) of 6234 K, indicating that it is promising for single-component white-light-emitting applications. The nanocrystals reported in this study have excellent luminescence properties, low toxicity, and superior stability, so they are more suitable for future light-emitting applications.
全无机铯铜卤化物纳米晶体因其成本效益高、毒性低和发光特性丰富而备受广泛关注。然而，控制这些纳米晶体的合成以实现精确的组成和高发光效率仍然是一个挑战，这限制了它们未来的应用。在此，我们报道了碘化油胺对卤化铜纳米晶体合成的影响，以控制其组成和相，并调节其光致发光（PL）量子产率（QYs）。对于CsCuI，PL峰位于560nm，PLQY为47.3%，而CsCuI的PL峰位于440nm，PLQY高达95.3%，这是前所未有的。此外，中间态CsCuI/CsCuI异质结构显示出白光发射，PLQY为66.4%，色度坐标为（0.3176，0.3306），高显色指数（CRI）为90，相关色温（CCT）为6234K，表明其在单组分白光发射应用方面具有潜力。本研究报道的纳米晶体具有优异的发光性能、低毒性和卓越的稳定性，因此更适合未来的发光应用。
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