Time-resolved thermally activated delayed fluorescence in C70 and 1,2-C70H2

被引：33

作者：

Bachilo, SM ^{[1
]}

Benedetto, AF ^{[1
]}

Weisman, RB ^{[1
]}

Nossal, JR ^{[1
]}

Billups, WE ^{[1
]}

机构：

[1] Rice Univ, Dept Chem, Houston, TX 77251 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2000年 / 104卷 / 48期

关键词：

D O I：

10.1021/jp002742k

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：

Thermally activated delayed fluorescence (TDF) emission from C-70 and 1,2-C70H2 has been time-resolved to provide thermodynamic and kinetic information on excited electronic states. The energy gap between S-1 and T-1 states was deduced from the temperature dependence of initial TDF intensities and independently from the ratio of TDF intensity to time-integrated prompt fluorescence. S-1-T-1 gaps were found to be approximately 2470 cm(-1) for C-70 and 2180 cm(-1) for 1,2-C70H2, with relative uncertainties of 2-3%. Time-resolved TDF measurements from fullerene samples immobilized in PMMA films revealed lifetimes for triplet state decay unaffected by bimolecular deactivation processes. The intrinsic triplet lifetimes at 298 K were found from both TDF and transient absorption measurements to be 24.5 +/- 1.5 ms for C-70 and 1.95 +/- 0.1 ms for 1,2-C70H2.

引用

页码：11265 / 11269

页数：5

共 19 条

[1] PHOTOPHYSICAL PROPERTIES OF C60 [J].