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Enhanced Charging/Discharging Process in Perovskite Active Light Source for High-Speed Visible-Light Communication
Zhang, Haoyue1; Tang, Yuru2; Chen, Chen2; Xiao, Meiqin1; Yang, Jonghee3; Zhang, Wei4; Qin, Chaochao5; Xiang, Ting1; Xu, Long1; Chen, Ping1
2023-12-13
摘要Metal halide perovskites are promising light source materials for visible light communication (VLC) due to their excellent photoelectric properties and small resistance-capacitance time constant. However, previous reports mainly used perovskites as the passive light sources, which not only makes it susceptible to posterior excitation light sources, but also complex in the integration process. Herein, the quasi-2D PEA(2)Cs(n-1)Pb(n)Br(3n+1) perovskite light-emitting diodes (PeLEDs) as an active light source in VLC link is demonstrated. It is found that the charging/discharging process of PeLEDs is an important factor governing the -3 dB bandwidth (f(-3 dB)) of the VLC. To improve this, 3-sulfopropyl methacrylate potassium salt (SMPS) molecules are introduced into perovskite to simultaneously passivate deep and shallow energy level defects at grain boundaries. Additionally, the multiple quantum wells structures of PEA(2)Cs(n-1)Pb(n)Br(3n+1) are modified to be flat. At the optimal SMPS concentration, the maximum external quantum efficiency of PeLEDs reaches 21.5%. Meanwhile, the VLC achieves 3.2 MHz f(-3 dB) with data transmission of 18.6 Mbps, which is the highest f(-3 dB) in PeLEDs with the same active area. Hence, it provides a versatile method to improve the performance of VLC links based on active light sources and advances toward the goal of high-speed, energy-efficient and secure free communication. Charging/discharging process of the quasi-2D perovskite is substantially enhanced by comprehensive dual-surface defect passivation of SMPS, which also flattened multiple quantum wells structure. This realizes high-speed and efficient visible light communication using a perovskite light-emitting diode as an active light source.image
关键词-3 dB bandwidth active light sources light emitting diodes quasi-2D perovskite visible light communication
DOI10.1002/adom.202303051
发表期刊ADVANCED OPTICAL MATERIALS
ISSN2195-1071
页码12
通讯作者Chen, Chen(c.chen@cqu.edu.cn) ; Zhang, Wei(zhangwei@cigit.ac.cn) ; Qin, Chaochao(qinchaochao@htu.edu.cn) ; Chen, Ping(pingchen@swu.edu.cn)
收录类别SCI
WOS记录号WOS:001124880700001
语种英语