Results
Title

Doped Zero‐Dimensional Cesium Zinc Halides for High‐Efficiency Blue Light Emission.

Authors

Cheng, Pengfei; Feng, Lu; Liu, Yuefeng; Zheng, Daoyuan; Sang, Youbao; Zhao, Wenyuan; Yang, Yang; Yang, Songqiu; Wei, Donghui; Wang, Guoxiong; Han, Keli

Abstract

All‐inorganic zero‐dimensional (0D) metal halides have recently received increasing attention due to their excellent photoluminescence (PL) performance and high stability. Herein, we present the successful doping of copper(I) into 0D Cs2ZnBr4. The incorporating of Cu+ cations enables the originally weakly luminescent Cs2ZnBr4 to exhibit an efficient blue emission centered at around 465 nm, with a high photoluminescence quantum yield (PLQY) of 65.3 %. Detailed spectral characterizations, including ultrafast transient absorption (TA) techniques, were carried out to investigate the effect of Cu+ dopants and the origin of blue emission in Cs2ZnBr4:Cu. To further study the role of the A‐site cation and halogen, A2ZnCl4:Cu (A=Cs, Rb) were also synthesized and found to generate intense sky‐blue emission (PLQY≈73.1 %). This work represents an effective strategy for the development of environmentally friendly, low‐cost and high‐efficiency blue‐emitting 0D all‐inorganic metal halides.

Subjects

ZINC halides; BLUE light; METAL halides; PHOTOLUMINESCENCE; RUBIDIUM compounds; CESIUM compounds

Publication

Angewandte Chemie, 2020, Vol 132, Issue 48, p21598

ISSN

0044-8249

Publication type

Academic Journal

DOI

10.1002/ange.202008098