量子点
配体(生物化学)
发光二极管
溶剂
二极管
光电子学
材料科学
过程(计算)
量子效率
光化学
纳米技术
化学物理
化学
计算机科学
有机化学
操作系统
受体
生物化学
作者
Jingcong Hu,Chenghao Bi,Ke Ren,Xuetao Zhang,Weiqiang Wang,Sai Ma,Mingzhi Wei,Yue Lu,Manling Sui
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-02
标识
DOI:10.1021/acs.nanolett.4c00651
摘要
Efficient pure-red emission light-emitting diodes (LEDs) are essential for high-definition displays, yet achieving pure-red emission is hindered by challenges like phase segregation and spectral instability when using halide mixing. Additionally, strongly confined quantum dots (QDs) produced through traditional hot-injection methods face byproduct contamination due to poor solubility of metal halide salts in the solvent octadecene (ODE) at low temperatures. Herein, we introduced a novel method using a benzene-series strongly electrostatic potential solvent instead of ODE to prevent PbI2 intermediates and promote their dissolution into [PbI3]−. Increasing methyl groups on benzene yields precisely sized (4.4 ± 0.1 nm) CsPbI3 QDs with exceptional properties: a narrow 630 nm PL peak with photoluminescence quantum yield (PLQY) of 97%. Sequential ligand post-treatment optimizes optical and electrical performance of QDs. PeLEDs based on optimized QDs achieve pure-red EL (CIE: 0.700, 0.290) approaching Rec. 2020 standards, with an EQE of 25.2% and T50 of 120 min at initial luminance of 107 cd/m2.
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