Highly Photoluminescent CsPbBr3/CsPb2Br5 NCs@TEOS Nanocomposite in Light-Emitting Diodes

Yufeng Zhou; Yanxia Yu; Yaqian Zhang; Xiaodong Liu; Haisheng Yang; Xiaojuan Liang; Wei Xia; Weidong Xiang

doi:10.1021/acs.inorgchem.0c03573

Highly Photoluminescent CsPbBr₃/CsPb₂Br₅ NCs@TEOS Nanocomposite in Light-Emitting Diodes

Inorg Chem. 2021 Mar 15;60(6):3814-3822. doi: 10.1021/acs.inorgchem.0c03573. Epub 2021 Feb 11.

Authors

Yufeng Zhou¹, Yanxia Yu¹, Yaqian Zhang¹, Xiaodong Liu¹, Haisheng Yang¹, Xiaojuan Liang¹, Wei Xia¹, Weidong Xiang¹

Affiliation

¹ College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China.

PMID: 33570916
DOI: 10.1021/acs.inorgchem.0c03573

Abstract

All-inorganic halide perovskite (CsPb₂Br₅) nanocrystals (NCs) have received widespread attention owing to their unique photoelectric properties. This work reports a novel strategy to control the phase transition from CsPbBr₃ to CsPb₂Br₅ and investigates the effects of different treatment times and treatment temperatures on perovskite NCs formation. By controlling the volume of tetraethoxysilane (TEOS) added, the formation of different phases of perovskite powder can be well controlled. In addition, a white light-emitting diode (WLED) device is designed by coupling the CsPbBr₃/CsPbBr₃-CsPb₂Br₅ NCs@TEOS nanocomposite and CaAlSiN₃:Eu²⁺ commercial phosphor with a 460 nm InGaN blue chip, exhibiting a high luminous efficiency of 57.65 lm/W, color rendering index (CRI) of 91, and a low CCT of 5334 K. The CIE chromaticity coordinates are (0.3363, 0.3419). This work provides a new strategy for the synthesis of CsPbBr₃/CsPbBr₃-CsPb₂Br₅ NCs@TEOS nanocomposite, which can be applied to the field of WLEDs and display devices.