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Licensed Unlicensed Requires Authentication Published by De Gruyter April 19, 2023

White light emission from an upconverted emission based on triplet-triplet annihilation with rose bengal as the sensitizer

  • Hung-Cheng Chen EMAIL logo , Chen-Yen Hung , Chih-Wei Lin , Kuan-Hsiang Wang , Mandy M. Lee , Peilin Chen , Tashin J. Chow EMAIL logo , Chao-Ping Hsu EMAIL logo and Shih-Sheng Sun EMAIL logo


In this work, we report an energy upconversion system based on triplet-triplet annihilation comprised of rose bengal dye as the sensitizer and a highly fluorescent 9-(triphenyl)ethynyl-10-phenylanthracene (TPE-PAn) as the triplet annihilator. The energy upconversion can be observed with a low-power laser excitation at 532 nm or noncoherent Xe arc lamp excitaion at 540 nm. A delayed fluorescence from (TPE-PAn) at 418 nm was observed with an energy upconversion up to 0.64 eV and quantum yield of 0.8 %. A white-light emission was achieved as a result of combination of delayed fluorescence from TPE-PAn and residual fluorescence from rose bengal dye.

Corresponding authors: Hung-Cheng Chen, Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan, Republic of China; Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung, 81148, Taiwan, Republic of China, E-mail: ; and Tashin J. Chow, Chao-Ping Hsu and Shih-Sheng Sun, Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan, Republic of China, E-mail: , (C.-P. Hsu), (S.-S. Sun)
Article note: A collection of invited papers based on presentations at the 25th International Conference on Physical Organic Chemistry which was held in Hiroshima, Japan on 10–15th July 2022.

Funding source: National Science and Technology Council of Taiwan

Award Identifier / Grant number: MOST 111-2113-M-001-041

Funding source: Academia Sinica


We are grateful to the National Science and Technology Council of Taiwan and Research Program on Nanoscience and Nanotechnology of Academia Sinica for support of this research.


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Published Online: 2023-04-19
Published in Print: 2023-04-25

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