Direct measurements of intersystem crossing rates and triplet decays of luminescent conjugated oligomers in solutions
Resource
Journal of Physical Chemistry A 111 (38): 9424-9430
Journal
Journal of Physical Chemistry A
Journal Volume
111
Journal Issue
38
Pages
9424-9430
Date Issued
2007
Author(s)
Chen, Hsin-Liang
Huang, Yi-Fang
Hsu, Chao-Ping
Lim, Tsong-Shin
Kuo, Li-Chung
Chao, Teng-Chih
Chen, Show-An
Fann, Wunshain
Abstract
Photothermal calorimetry and fluorescence spectroscopy were used to determine the relaxations of the photoexcited singlet state of two PPV and polyfluorene oligomers, (E,E)-1,4-bis[(2-benzyloxy)styryl]benzene (PVDOP) and ter(9,9'-spirobifluorene) (TSBF). The decay rates of different S1 relaxation channels, which include intersystem crossing (ISC), radiative, and nonradiative decay can be determined by the combination of photoacoustic calorimetry (PAC) and the time-correlated single photon counting (TCSPC) technique. The triplet state energy level is determined by the phosphorescence (Ph) spectra recorded at 77 K. The ISC yields are approximately 3% and 6% for PVDOP and TSBF, respectively. The T1 to S0 transition decay rate is acquired by PAC and photothermal beam deflection (PBD) measurements. The triplet state decay rate is 17 and 21 ms(-1) at room temperature. The Ph intensity decay at 77 K shows that the triplet state lifetime increases by 4 orders of magnitude, as compared to room temperature.
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Type
journal article
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