Ultralong UV/mechano-excited room temperature phosphorescence from purely organic cluster excitons

Xuepeng Zhang, Lili Du, Weijun Zhao, Zheng Zhao, Yu Xiong, Xuewen He, Peng Fei Gao, Parvej Alam, Can Wang, Zhen Li, Jing Leng, Junxue Liu, Chuanyao Zhou, Jacky W. Y. Lam, David Lee Phillips (), Guoqing Zhang () and Ben Zhong Tang ()
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Xuepeng Zhang: The Hong Kong University of Science and Technology
Lili Du: The University of Hong Kong
Weijun Zhao: The Hong Kong University of Science and Technology
Zheng Zhao: The Hong Kong University of Science and Technology
Yu Xiong: The Hong Kong University of Science and Technology
Xuewen He: The Hong Kong University of Science and Technology
Peng Fei Gao: The Hong Kong University of Science and Technology
Parvej Alam: The Hong Kong University of Science and Technology
Can Wang: Wuhan University
Zhen Li: Wuhan University
Jing Leng: Chinese Academy of Sciences
Junxue Liu: Chinese Academy of Sciences
Chuanyao Zhou: Chinese Academy of Sciences
Jacky W. Y. Lam: The Hong Kong University of Science and Technology
David Lee Phillips: The University of Hong Kong
Guoqing Zhang: University of Science and Technology of China
Ben Zhong Tang: The Hong Kong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Purely organic room temperature phosphorescence (RTP) has attracted wide attention recently due to its various application potentials. However, ultralong RTP (URTP) with high efficiency is still rarely achieved. Herein, by dissolving 1,8-naphthalic anhydride in certain organic solid hosts, URTP with a lifetime of over 600 ms and overall quantum yield of over 20% is realized. Meanwhile, the URTP can also be achieved by mechanical excitation when the host is mechanoluminescent. Femtosecond transient absorption studies reveal that intersystem crossing of the host is accelerated substantially in the presence of a trace amount of 1,8-naphthalic anhydride. Accordingly, we propose that a cluster exciton spanning the host and guest forms as a transient state before the guest acts as an energy trap for the RTP state. The cluster exciton model proposed here is expected to help expand the varieties of purely organic URTP materials based on an advanced understanding of guest/host combinations.

Date: 2019
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DOI: 10.1038/s41467-019-13048-x

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