材料科学
混合材料
荧光粉
纳米技术
光电子学
化学工程
工程类
作者
Kai Han,Jiance Jin,Xinquan Zhou,Yan Duan,Maksym V. Kovalenko,Zhiguo Xia
标识
DOI:10.1002/adma.202313247
摘要
Abstract Low‐dimensional metal halide perovskites are an emerging class of light‐emitting materials for LED‐based displays; however, their B‐site cations are confined to ns 2 , d 5, and d 10 metals. Here, we present the design of rare earth ions at B‐site and report a novel Eu(II)‐based iodide hybrid with efficient (PLQY ∼ 98%) narrow‐band (FWHM ∼ 43 nm) green emission and high thermal stability (97%@150 °C). Owing to reduced lattice vibrations and shrunken average distance of Eu(II)‐iodide bonds in the face‐sharing 1D‐structure, photoluminescence from Eu(II) 4 f ‐5 d transition appears along with elevated crystal‐field splitting of 5 d energy level. We further demonstrate the Eu(II)‐based iodide hybrid for color‐pure green pc‐LEDs with a maximum brightness of approximately 396,000 cd m −2 and photoelectric efficiency of 29.2%. We also present high‐resolution micro‐LED displays (2540 PPI) via the solution‐processed screen. This work thus showcases a compelling narrow‐band green emitter for commercial micro‐LED displays. This article is protected by copyright. All rights reserved
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