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p-type OLPL system_final.pdf (2.17 MB)

Air-Stable and Visible-Light-Active P-Type Organic Long-Persistent-Luminescence System by Using Organic Photoredox Catalyst

preprint
submitted on 15.02.2021, 01:45 and posted on 16.02.2021, 13:12 by Kazuya Jinnai, Ryota Kabe, Zesen Lin, Chihaya Adachi

Organic long-persistent-luminescent (OLPL) materials that exhibit hour-long photoluminescence have advantages over inorganic materials, such as a sustainability, flexibility, and processability. The OLPL materials store the absorbed energy in an intermediate charge-separated state, but this charge-separated state is unstable to oxygen and does not exhibit persistent luminescence in air. The excitation wavelength of OLPL can be controlled by electron-donor and -acceptor materials, but previous materials require absorption mainly in the ultraviolet region.

Here, we show OLPL systems that exhibit a persistent luminescence in air and can be excited by a wavelength from 300-nm to 600-nm. By using cationic photoredox catalysts as an electron-accepting dopant, stable charge-separated states are generated by the hole-diffusion process, as opposed to previous OLPL systems that depend on electron diffusion. By using a hole-diffusion mechanism and reducing the energy level of the lowest unoccupied molecular orbital, the OLPL system becomes stable in air and can be excited by visible light. The addition of hole-trapping material increases the LPL duration..

Funding

The Exploratory Research for Advanced Technology JPMJER1305

JSPS KAKENHI JP18H02049 and JP18H04522

The Kyushu University Platform of Inter/Transdisciplinary Energy Research, young researcher/doctor student support program

History

Email Address of Submitting Author

adachi@cstf.kyushu-u.ac.jp

Institution

Kyushu Univerisity

Country

Japan

ORCID For Submitting Author

0000-0001-6117-9604

Declaration of Conflict of Interest

No conflict of interest

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