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Research Article | Open Access

Stable yellow light emission from lead-free copper halides single crystals for visible light communication

Baiqian Wanga, Yuru Tangb, Xin Yanga, Wensi Caia, Ru Lia, Wen Maa, Shuangyi Zhaoa( ), Chen Chenb( ), Zhigang Zanga( )
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing, 400044, China
School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, 400044, China
Show Author Information

Abstract

Yellow light-emitting diodes (LEDs) as soft light have attracted abundant attention in lithography room, museum and art gallery. However, the development of efficient yellow LEDs lags behind green and blue LEDs, and the available perovskites yellow LEDs suffer from the instability. Herein, a pressure-assisted cooling method is proposed to grow lead-free CsCu2I3 single crystals, which possess uniform surface morphology and enhanced photoluminescence quantum yield (PLQY) stability, with only 10% PLQY losses after being stored in air after 5000 ​h. Then, the single crystals used for yellow LEDs without encapsulation exhibit a decent Correlated Color Temperature (CCT) of 4290 ​K, a Commission Internationale de l'Eclairage (CIE) coordinate of (0.38, 0.41), and an excellent 570-h operating stability under heating temperature of 100 ​℃. Finally, the yellow LEDs facilitate the application in wireless visible light communication (VLC), which show a −3 dB bandwidth of 21.5 ​MHz and a high achievable data rate of 219.2 Mbps by using orthogonal frequency division multiplexing (OFDM) modulation with adaptive bit loading. The present work not only promotes the development of lead-free single crystals, but also inspires the potential of CsCu2I3 in the field of yellow illumination and wireless VLC.

Keywords

Lead-free copper halidesSingle crystalsYellow light-emitting diodesVisible light communication (VLC)

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Nano Materials Science
Volume 5 Issue 1,
March 2023
Pages 78-85
DOI: 10.1016/j.nanoms.2022.03.003
Cite this article:
Wang B, Tang Y, Yang X, et al. Stable yellow light emission from lead-free copper halides single crystals for visible light communication. Nano Materials Science, 2023, 5(1): 78-85. https://doi.org/10.1016/j.nanoms.2022.03.003

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Received: 05 January 2022
Accepted: 25 February 2022
Published: 01 April 2022
© 2023 Chongqing University.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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