Issue

Vol. 17 (2025)

Rewritable Triple-Mode Light-Emitting Display

https://doi.org/10.1007/s40820-025-01686-4
Seokyeong Lee
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jong Woong Park
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jihye Jang
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jin Woo Oh
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Gwanho Kim
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jioh Yoo
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jong Gun Jung
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Hyowon Han
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Wei Jiang
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Chang Eun Lee
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Jungwon Yoon
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Kaiying Zhao
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
Cheolmin Park
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea

Corresponding Author: Cheolmin Park

cmpark@yonsei.ac.kr

Nano-Micro Letters, Vol. 17 (2025), Article Number: 183

Abstract

Despite great progress in developing mode-selective light emission technologies based on self-emitting materials, few rewritable displays with mode-selective multiple light emissions have been demonstrated. Herein, we present a rewritable triple-mode light-emitting display enabled by stimuli-interactive fluorescence (FL), room-temperature phosphorescence (RTP), and electroluminescence (EL). The display comprises coplanar electrodes separated by a gap, a polymer composite with FL inorganic phosphors (EL/FL layer), and a polymer composite with solvent-responsive RTP additives (RTP layer). Upon 254 nm UV exposure, a dual-mode emission of RTP and FL occurs from the RTP and EL/FL layers, respectively. When a polar liquid, besides water, is applied on the display and an AC field is applied between the coplanar electrodes, EL from the EL/FL layer is triggered, and the display operates in a triple mode. Interestingly, when water is applied to the display, the RTP mode is deactivated, rendering the display to operate in a dual mode of FL and EL. By manipulating the evaporation of the applied polar liquids and water, the mode-selective light emission of FL, RTP, and EL is rewritable in the triple-mode display. Additionally, a high-security full-color information encryption display is demonstrated, wherein the information of digital numbers, letters, and Morse code encoded in one optical mode is only deciphered when properly matched with that encoded in the other two modes. Thus, this article outlines a strategy to fulfill the substantial demand for high-security personalized information based on room-temperature multi-light-emitting displays.


Highlights:
1 A rewritable triple-mode light-emitting display (RE-TriLED) was fabricated, enabled by stimuli-interactive fluorescence (FL), room-temperature phosphorescence (RTP), and electroluminescence (EL).
2 Mode-selective multiple light emission is achieved, in which the three emission modes of FL, RTP, and EL are readily manipulated through the controlled evaporation of polar liquids and water.
3 A high-security, full-color information encryption display is demonstrated, wherein optical information encoded in one mode is decipherable only when properly aligned with the other two modes.

Keywords

Alternating-current electroluminescence Room-temperature phosphorescence Stimuli-responsive materials Multimode luminescence Information encryption
Lee, Seokyeong, Jong Woong Park, Jihye Jang, Jin Woo Oh, Gwanho Kim, Jioh Yoo, Jong Gun Jung, Hyowon Han, Wei Jiang, Chang Eun Lee, Jungwon Yoon, Kaiying Zhao, and Cheolmin Park. 2025. “Rewritable Triple-Mode Light-Emitting Display”. Nano-Micro Letters 17 (March):183. https://doi.org/10.1007/s40820-025-01686-4.
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