Highly Stable and Photoluminescent CsPbBr3/Cs4PbBr6 Composites for White-Light-Emitting Diodes and Visible Light Communication

Longshi Rao; Bin Sun; Yang Liu; Guisheng Zhong; Mingfu Wen; Jiayang Zhang; Ting Fu; Shuangxi Wang; Fengtao Wang; Xiaodong Niu

doi:10.3390/nano13020355

Highly Stable and Photoluminescent CsPbBr₃/Cs₄PbBr₆ Composites for White-Light-Emitting Diodes and Visible Light Communication

Nanomaterials (Basel). 2023 Jan 15;13(2):355. doi: 10.3390/nano13020355.

Authors

Longshi Rao^{1

2}, Bin Sun^{1

2}, Yang Liu^{1

2}, Guisheng Zhong^{1

2}, Mingfu Wen^{1

2}, Jiayang Zhang^{1

2}, Ting Fu³, Shuangxi Wang^{1

2}, Fengtao Wang^{1

2}, Xiaodong Niu^{1

2}

Affiliations

¹ Department of Mechanical Engineering, College of Engineering, Shantou University, Shantou 515063, China.
² Intelligent Manufacturing Key Laboratory of Ministry of Education, Shantou University, Shantou 515063, China.
³ Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.

Abstract

Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr₃/Cs₄PbBr₆ composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr₃/Cs₄PbBr₆ composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs₄PbBr₆ matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr₃/Cs₄PbBr₆-LP are significantly improved compared to CsPbBr₃ quantum dots and CsPbBr₃/Cs₄PbBr₆ composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr₃/Cs₄PbBr₆-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr₃/Cs₄PbBr₆-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC.

Keywords: CsPbBr3/Cs4PbBr6; liquid paraffin; ultrasonication; visible light communication; white-light-emitting diodes.

Abstract

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