Guo Jie, Fu Yuhao, Zheng Weijia, Xie Mingyuan, Huang Yuchao, Miao Zeyu, Han Ce, Yin Wenxu, Zhang Jiaqi, Yang Xuyong, Tian Jianjun, Zhang Xiaoyu
Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130012, P.R. China.
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Nano Lett. 2024 Jan 10;24(1):417-423. doi: 10.1021/acs.nanolett.3c04214. Epub 2023 Dec 27.
Spectrally stable pure-red perovskite quantum dots (QDs) with low lead content are essential for high-definition displays but are difficult to synthesize due to QD self-purification. Here, we make use of entropy-driven quantum-confined pure-red perovskite QDs to fabricate light-emitting diodes (LEDs) that have low toxicity and are efficient and spectrum-stable. Based on experimental data and first-principles calculations, multiple element alloying results in a 60% reduction in lead content while improving QD entropy to promote crystal stability. Entropy-driven QDs exhibit photoluminescence with 100% quantum yields and single-exponential decay lifetimes without alteration of their morphology or crystal structure. The pure-red LEDs utilizing entropy-driven QDs have spectrally stable electroluminescence, achieving a brightness of 4932 cd/m, a maximum external quantum efficiency of over 20%, and a 15-fold longer operational lifetime than the CsPbI QD-based LEDs. These achievements demonstrate that entropy-driven QDs can mitigate local compositional heterogeneity and ion migration.
低铅含量的光谱稳定纯红色钙钛矿量子点（QDs）对于高清显示屏至关重要，但由于量子点的自净化作用，其合成难度较大。在此，我们利用熵驱动的量子限制纯红色钙钛矿量子点来制造毒性低、效率高且光谱稳定的发光二极管（LED）。基于实验数据和第一性原理计算，多元素合金化使铅含量降低了60%，同时提高了量子点的熵以促进晶体稳定性。熵驱动的量子点表现出100%量子产率的光致发光和单指数衰减寿命，且其形态和晶体结构未发生改变。利用熵驱动量子点的纯红色发光二极管具有光谱稳定的电致发光，亮度达到4932 cd/m，最大外量子效率超过20%，并且工作寿命比基于CsPbI量子点的发光二极管长15倍。这些成果表明，熵驱动的量子点可以减轻局部成分不均匀性和离子迁移。
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