Room-Temperature Large-Scale Synthesis of Black-Phase CsPbI3 Nanocrystals for Red Light-Emitting Diodes

被引:0
作者
Yoo, Ju-Hyun [1 ]
Jang, Kyung Yeon [2 ]
Jang, Jihye [1 ]
Park, Cheolmin [1 ]
Lee, Tae-Woo [2 ,3 ]
Park, Jin-Woo [1 ]
机构
[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea
[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea
[3] Seoul Natl Univ, Inst Engn Res, Res Inst Adv Mat, Sch Chem & Biol Engn,Soft Foundry, Seoul 08826, South Korea
基金
新加坡国家研究基金会;
关键词
cesium lead iodide; perovskite nanocrystals; large-scale synthesis; room-temperature synthesis; red light-emitting diodes; LEAD HALIDE PEROVSKITES; QUANTUM DOTS; STABILITY; BR; CL;
D O I
10.1021/acsanm.4c04001
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Inorganic perovskite nanocrystals (IPNCs) are gaining attention as next-generation luminescent materials due to their excellent optoelectronic properties and thermal stability. However, current challenges in achieving large-scale synthesis hinder quality improvement and their commercialization. In particular, CsPbI3, which exhibits red emission, stabilizes in a nonradiative yellow phase at room temperature, making it difficult to synthesize the radiative black phase under ambient conditions. Currently, the synthesis of IPNCs is limited to small-scale laboratory procedures. In response to the demand for stable room-temperature synthesis methods of CsPbI3 and the need for large-scale synthesis of IPNCs, we present large-scale synthesis of black-phase CsPbI3 nanocrystals at room temperature by starting from nanostructures and adjusting the Cs-to-Pb ratio to prevent the formation of yellow-phase CsPbI3. The probability of cesium occupying the A site in the perovskite structure (ABX3) varies with the Cs-to-Pb ratio, leading to differences in the growth rate of the nanocrystals. By adjusting the amount of oleylammonium on the surface of the CsPbI3 nanocrystals, we controlled the synthesis process. As a result, we achieved a photoluminescence quantum yield (PLQY) of 72% at 670 nm by synthesizing CsPbI3 nanocrystals in a 1 L bottle, utilizing more than 800 times the compound quantity compared to laboratory-scale methods. Furthermore, we fabricated red light-emitting diodes (LEDs) with an external quantum efficiency of 6.4% and a full width at half-maximum (fwhm) of 33 nm. This room-temperature large-scale synthesis method for CsPbI3 nanocrystals holds significant promise for the future commercialization of inorganic perovskite LEDs.
引用
收藏
页码:28119 / 28130
页数:12
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