TY - JOUR
T1 - Kinetically controlled crystal growth approach to enhance triplet energy migration-based photon upconversion
AU - Ogawa, Taku
AU - Yanai, Nobuhiro
AU - Kouno, Hironori
AU - Kimizuka, Nobuo
N1 - Funding Information:
This work was partly supported by the JSPS KAKENHI Grant Nos. JP25220805, JP17H04799, JP16H06513 (Coordination Asymmetry), JP16H00844 (Soft Molecular Systems), PRESTO program on “Molecular Technology and Creation of New Functions” from JST (JPMJPR14KE), and the Asahi Glass Foundation.
Publisher Copyright:
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).
PY - 2018/4/1
Y1 - 2018/4/1
N2 - 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.
AB - 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.
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U2 - 10.1117/1.JPE.8.022003
DO - 10.1117/1.JPE.8.022003
M3 - Article
AN - SCOPUS:85035121221
SN - 1947-7988
VL - 8
JO - Journal of Photonics for Energy
JF - Journal of Photonics for Energy
IS - 2
M1 - 022003
ER -
