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Journal of Photonics for Energy • Open Access

Kinetically controlled crystal growth approach to enhance triplet energy migration-based photon upconversion
Author(s): Taku Ogawa; Nobuhiro Yanai; Hironori Kouno; Nobuo Kimizuka

Paper Abstract

Improving efficiency of triplet–triplet annihilation-based photon upconversion (TTA-UC) in crystalline media is challenging because it usually suffers from the severe aggregation of the donor (sensitizer) molecules in acceptor (emitter) crystals. We show a kinetically controlled crystal growth approach to improve donor dispersibility in acceptor crystals. As the donor–acceptor combination, a benchmark pair of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA) is employed. A surfactant-assisted reprecipitation technique is employed, where the concentration of the injected PtOEP–DPA solution holds the key to control dispersibility; at a higher PtOEP–DPA concentration, a rapid crystal growth results in better dispersibility of PtOEP molecules in DPA crystals. The improvement of donor dispersibility significantly enhances the TTA-UC quantum yield. Thus, the inherent function of donor-doped acceptor crystals can be maximized by controlling the crystallization kinetics.

Paper Details

Date Published: 6 November 2017
PDF: 11 pages
J. Photon. Energy 8(2) 022003 doi: 10.1117/1.JPE.8.022003
Published in: Journal of Photonics for Energy Volume 8, Issue 2
Show Author Affiliations
Taku Ogawa, Kyushu Univ. (Japan)
Nobuhiro Yanai, Kyushu Univ. (Japan)
Japan Science and Technology Agency (Japan)
Hironori Kouno, Kyushu Univ. (Japan)
Nobuo Kimizuka, Kyushu Univ. (Japan)


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