论文标题
CSPBBR $ _3 $和Mn $^{2+} $的光物理特性的改善：CSPB（Br，Cl）$ _ 3 $ perovskite nanocrystals by Sr $^{2+}
Improvement of Photophysical Properties of CsPbBr$_3$ and Mn$^{2+}$:CsPb(Br,Cl)$_3$ Perovskite Nanocrystals by Sr$^{2+}$ Doping and Their Application in White-LEDs
论文作者
论文摘要
全无机铅卤化物钙钛矿纳米晶体（NCS）在光电设备中显示出潜力，尽管它们的稳定性和效率尚未提高。在这项工作中，我们探讨了二价金属位点掺杂对CSPBX $ _3 $（x = br，cl）Perovskite ncs的光电特性的影响。首先，原始CSPBBR $ _3 $ NC中的Pb $^{2+} $离子被Mn $^{2+} $ ions代替，然后将碱性的金属层掺杂，然后在原始和MN $^{2+} $替代的粒子上掺杂。已经对原始的原始结构和光物理特性进行了实验研究，并利用了第一原理计算。我们发现，SR $^{2+} $的一小部分 - 掺杂将原始粒子的光致发光量子产率提高了8％，而Mn $^{2+} $ - 状态排放提高了7％。具有所有四个NC变体的钙钛矿NC膜/聚甲基丙烯酸甲酯复合材料均用于白光发光二极管（WLED），并且发现两个SR $^{2+} $掺杂的NC均可提高WEL LED的发光效率。我们将这种性能增强归因于局部NC结构中的缺陷密度以及减弱的微晶体。
All-inorganic lead halide perovskite nanocrystals (NCs) show potential in optoelectronic devices, though their stability and efficiency have yet to improve. In this work, we explore the effect of bivalent metal site doping on the optoelectronic properties of CsPbX$_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.
