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arXiv 2201.12067physics.app-phcond-mat.mtrl-sci
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Sr $^{2+}$掺杂对CsPbBr $_3$和Mn $^{2+}$：CsPb（Br，Cl）$_3$纳米晶光物理性能的改善及其在白光LED中的应用

Improvement of Photophysical Properties of CsPbBr$_3$ and Mn$^{2+}$:CsPb(Br,Cl)$_3$ Perovskite Nanocrystals by Sr$^{2+}$ Doping and Their Application in White-LEDs

Hurriyet Yuce, Mukunda Mandal, Yenal Yalcinkaya, Denis Andrienko, Mustafa M. Demir

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摘要：

全无机卤化铅钙钛矿纳米晶（NC）在光电子器件中显示出潜力，但其稳定性和效率还有待提高。在这项工作中，我们探讨了二价金属位掺杂对CsPbX $_3$（X = Br，Cl）钙钛矿纳米晶体光电性能的影响。首先，原始CsPbBr $_3$ NC中的Pb $^{2+}$离子被Mn $^{2+}$离子部分取代，然后碱土金属锶掺杂在原始和Mn $^{2+}$取代的颗粒上。原始的和三个掺杂的NC变体的结构和物理性质进行了实验研究，以及利用第一性原理计算。我们发现，一个小的百分比的Sr $^{2+}$ -掺杂提高了8%的原始颗粒的光致发光量子产率，而它提高了Mn $^{2+}$ -态发射7%。将具有所有四种NC变体的Percent NC膜/聚（甲基丙烯酸甲酯）复合材料用于白光发光二极管（WLED）中，并且再次发现Sr $^{2+}$掺杂的NC使WLED的发光效率增加约4%。我们将此性能增强归因于降低的缺陷密度以及局部NC结构中的衰减的微应变。

英文摘要：

All-inorganic lead halide perovskite nanocrystals (NCs) show potential in optoelectronic devices, though their stability and efficiency have yet to improve. In this work, we explore the effect of bivalent metal site doping on the optoelectronic properties of CsPbX$_3$ (X = Br, Cl) perovskite NCs. First, the Pb$^{2+}$ ions in pristine CsPbBr$_3$ NC are partially substituted by Mn$^{2+}$ ions, and the alkaline earth metal strontium is then doped on both pristine and Mn$^{2+}$-substituted particles. The structural and photophysical properties of the pristine and the three doped NC variants have been investigated experimentally as well as exploiting first principles calculations. We found that a small percentage of Sr$^{2+}$-doping improved the photoluminescence quantum yield of the pristine particle by 8%, while it improved the Mn$^{2+}$-state emission by 7%. Perovskite NC film/poly(methyl methacrylate) composites with all four NC variants were used in a white light-emitting diode (WLED) and again both Sr$^{2+}$ doped NCs were found to increase the luminous efficiency of the WLED by ca 4 %. We attribute this performance enhancement to a reduced defect density as well as an attenuated microstrain in the local NC structure.

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