Tunable White Light-Emitting Devices Based on Unilaminar High-Efficiency Zn2+-Doped Blue CsPbBr3 Quantum Dots

Shuai Zhang; Longfei Yuan; Hongli Liu; Guofu Zhou; Weigang Ding; Zhanpeng Qin; Xianggao Li; Shirong Wang

doi:10.1021/acs.jpclett.1c02519

Tunable White Light-Emitting Devices Based on Unilaminar High-Efficiency Zn²⁺-Doped Blue CsPbBr₃ Quantum Dots

J Phys Chem Lett. 2021 Sep 9;12(35):8507-8512. doi: 10.1021/acs.jpclett.1c02519. Epub 2021 Aug 30.

Authors

Shuai Zhang^{1

2}, Longfei Yuan^{1

2}, Hongli Liu^{1

2}, Guofu Zhou³, Weigang Ding^{1

2}, Zhanpeng Qin^{1

2}, Xianggao Li^{1

2}, Shirong Wang^{1

2}

Affiliations

¹ School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
² Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
³ Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.

PMID: 34459608
DOI: 10.1021/acs.jpclett.1c02519

Abstract

Perovskite-based white-light-emitting devices (WLEDs) are expected to be the potential candidate for the next-generation lighting field due to their scalability and low-cost process. However, simple and adjustable WLED fabrication technology is in urgent need. Here, WLEDs with a single layer of perovskite quantum dots (PQDs) were constructed by combining Zn²⁺-doped CsPbBr₃ PQDs with exciplex emission between poly(9-vinylcarbazole) (PVK) and ((1-phenyl-1H-benzimidazol-2-yl)benzene)) (TPBi). Zn²⁺-doped CsPbBr₃ PQDs with polar ion shells were prepared by means of low temperature and post-treatment. The photoluminescence quantum yield (PLQY) can reach as high as 95.9% at the emission wavelength of 456 nm. The blue shift of its PL (∼60 nm) is much greater than that of other reported Zn²⁺-doped CsPbBr₃ PQDs (5-10 nm), thus realizing the true blue-emission Zn²⁺-doped CsPbBr₃ PQDs. As a result, just by controlling the thickness of TPBi, the adjustment of cold (CIE (0.2531, 0.2502)) and warm WLEDs (CIE (0.3561, 0.3562)) is realized for the first time.