钝化
钙钛矿(结构)
光致发光
材料科学
共聚物
卤化物
发光二极管
聚合物
密度泛函理论
激子
二极管
量子效率
热稳定性
化学工程
光电子学
化学
纳米技术
结晶学
计算化学
物理
无机化学
有机化学
复合材料
图层(电子)
工程类
量子力学
作者
Benzheng Lyu,Dongyu Li,Qiang Wang,Jiayun Sun,Qi Xiong,Dezhong Zhang,Haibin Su,Wallace C. H. Choy
标识
DOI:10.1002/anie.202408726
摘要
Abstract Mixed Br/Cl perovskite nanocrystals (PeNCs) exhibit bright pure‐blue emission benefiting for fulfilling the Rec. 2100 standard. However, phase segregation remains a significant challenge that severely affects the stability and emission spectrum of perovskite light‐emitting diodes (PeLEDs). Here, we demonstrate the optimization of the spacing between polydentate functional groups of polymer ligands to match the surface pattern of CsPbBr 1.8 Cl 1.2 PeNCs, resulting in effective synergistic passivation effect and significant improvements in PeLED performances. The block and alternating copolymers with different inter‐functional group spacing are facilely synthesized as ligands for PeNCs. Surprisingly, block copolymers with a higher functional group density do not match PeNCs, while alternating copolymers enable efficient PeNCs with the high photoluminescence intensity, low non‐radiative recombination rate and high exciton binding energy. Density functional theory calculations clearly confirm the almost perfect match between alternating copolymers and PeNCs. Finally, pure‐blue PeLEDs are achieved with the emission at 467 nm and Commission Internationale de l′Eclairage (CIE) coordinates of (0.131, 0.071), high external quantum efficiency (9.1 %) and record spectral and operational stabilities (~80 mins) in mixed‐halide PeLEDs. Overall, this study contributes to designing the polymer ligands and promoting the development of high‐performance and stable pure‐color PeLEDs towards display applications.
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