Solution-grown millimeter-scale Mn-doped CsPbBr3/Cs4PbBr6 crystals with enhanced photoluminescence and stability for light-emitting applications,Physical Chemistry Chemical Physics

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Solution-grown millimeter-scale Mn-doped CsPbBr3/Cs4PbBr6 crystals with enhanced photoluminescence and stability for light-emitting applications
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2023-11-22 , DOI: 10.1039/d3cp04371a
Wenfang Peng ₁ , Rongrong Hu ₁ , Bobo Yang ₁ , Qiaoyun Wu ₁ , Pan Liang ₂ , Lin Cheng ₃ , Xixi Cheng ₁ , Yuefeng Li ₁ , Jun Zou ₁

Affiliation

Metal halide perovskites are particularly emerging for optoelectronic applications in light-emitting diodes, photodetectors, and solar cells due to their flourishing photophysical properties. However, the poor stability of three-dimensional (3D) lead halide perovskite nanocrystals (NCs) significantly hampers their optoelectronics and photovoltaics applications. Embedding 3D perovskites into zero-dimensional (0D) perovskite crystals and doping ions of appropriate elements into host lattices provide effective approaches to improve the stability and optical-electronic performance. In this study, millimeter-scale Mn-doped and undoped CsPbBr₃/Cs₄PbBr₆ perovskite crystals were successfully fabricated by a one-step slow cooling method. We systematically investigated the effects of Mn²⁺ ion doping on the PL performance and stability of CsPbBr₃/Cs₄PbBr₆ crystals. Compared with undoped crystals, the existence of Mn²⁺ ions not only blue-shifted the PL peak but also improved the luminescence performance and stability of the prepared millimeter-sized crystals. Moreover, doping Mn²⁺ ions can increase the proportion of radiative recombination at low temperature, which may be because Mn²⁺ ions can effectively accelerate the decay of a dark exciton by the magnetic mixing of bright and dark excitons. In addition, green LED devices with high efficiency packaged as-grown crystals are explored, which promises further application in display backlights.

中文翻译：

溶液生长的毫米级 Mn 掺杂 CsPbBr3/Cs4PbBr6 晶体，具有增强的光致发光和稳定性，适用于发光应用

由于其丰富的光物理特性，金属卤化物钙钛矿在发光二极管、光电探测器和太阳能电池的光电应用中尤其新兴。然而，三维（3D）卤化铅钙钛矿纳米晶体（NC）的稳定性较差，严重阻碍了其光电和光伏应用。将 3D 钙钛矿嵌入零维 (0D) 钙钛矿晶体中，并将适当元素的离子掺杂到主晶格中，为提高稳定性和光电性能提供了有效的方法。本研究通过一步缓冷法成功制备了毫米级Mn掺杂和未掺杂CsPbBr ₃ /Cs ₄ PbBr ₆钙钛矿晶体。我们系统地研究了Mn ²⁺离子掺杂对CsPbBr ₃ /Cs ₄ PbBr ₆晶体PL性能和稳定性的影响。与未掺杂晶体相比，Mn ²⁺离子的存在不仅使PL峰蓝移，而且提高了所制备的毫米级晶体的发光性能和稳定性。此外，掺杂Mn ²⁺离子可以增加低温下辐射复合的比例，这可能是因为Mn ²⁺离子可以通过明暗激子的磁混合有效加速暗激子的衰变。此外，还探索了采用高效封装生长晶体的绿色LED器件，这有望在显示器背光领域得到进一步应用。

更新日期：2023-11-22

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