Radio-wave Effect on Singlet Fission in Polycrystalline Tetracene near Zero Magnetic Field

被引:2
作者
Ikoma, Tadaaki [1 ]
Wakikawa, Yusuke [2 ]
机构
[1] Niigata Univ, Grad Sch Sci & Technol, Nishi Ku, Niigata 9502181, Japan
[2] Shizuoka Inst Sci & Technol, Fukuroi, Shizuoka 4378555, Japan
关键词
DETECTED ESR-SPECTRA; EXCITON FISSION; TRIPLET EXCITONS; CRYSTALLINE TETRACENE; QUINTET MULTIEXCITONS; SPIN POLARIZATION; RADICAL PAIRS; FLUORESCENCE; COHERENCES; MODULATION;
D O I
10.1021/acs.jpclett.3c00341
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A triplet-triplet pair is a key intermediate in singlet fission (SF), which has the potential to overcome the theoretical limit of solar cell efficiency. Here, we report a new spectroscopy to directly detect a short-lived triplet-triplet pair via the effects of radio-wave (RF) irradiation near zero magnetic field at room temperature. The fluorescence of polycrystalline powder of tetracene is reduced by RF irradiation at zero field, which is caused by a quasi-static RF field effect on spin mixing and electron-spin resonance among zero-field splitting sublevels of the triplet-triplet pair. The curve for the quasi-static RF field effect can be reproduced numerically from that for the observed magnetophotoluminescence (MPL) effect. The simultaneous simulation of the RF and MPL effects using the density matrix formalism estimates rate constants of 1.2 x 10(8) and 6.0 x 10(8) s(-1) for the fusion and dissociation, respectively, of the triplet-triplet pair.
引用
收藏
页码:3907 / 3911
页数:5
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