'Excimer’ fluorescence II. Lifetime studies of pyrene solutions

The Royal Society - Tập 275 Số 1363 - Trang 575-588 - 1963
J. B. Birks1, D. J. Dyson1, Ian Munro1
1The Physical Laboratories , University of Manchester

Tóm tắt

Measurements have been made of the concentration dependence of the rise and decay time characteristics of the monomer and excimer fluorescence of deoxygenated solutions of pyrene in cyclohexane at temperatures from 293 to 340 °K. Two independent methods were employed, one using a pulsed light source and a pulse-sampling oscilloscope, and the other a modulated light source and a phase and modulation fluorometer. In conjunction with observations of the monomer and excimer fluorescence quantum efficiencies, the results have been analyzed to determine the six rate parameters which describe the behaviour of the system. Values of 6.8 x 10 -7 and 0.9 x 10 -7 s are obtained for the radiative lifetimes of the monomer and excimer, respectively. Excimer formation is shown to be a diffusion-controlled collision process, in which every collision between excited and unexcited molecules is effective. From the difference in the activation energies for excimer dissociation and formation, the excimer binding energy is found to be 0.34eV.

Từ khóa


Tài liệu tham khảo

1961, Nature, Lond., 191, 594

Birks J ., 1963, a Spectrochim, Acta, 19, 401

Birks J ., 1963, 6 Proc. Roy, Soc. A, 274, 552

10.1038/1971064a0

Birks J ., 1961, J . Sci., Instrum ., 38, 282

Birks J ., 1963, Proc. Roy, Soc. A, 275, 135

10.1088/0370-1328/80/2/302

10.1039/tf9545000097

Doller E . & F orster Th. 1962

F orster Th. 1962 Molecular spectroscopy. B u tte rw o rth 's.

Forster Th., 1955, Z, Elektrochem., 59, 977

Thông tin
Thông tin xuất bản

The Royal Society

Tập 275 Số 1363

575-588

Thông tin tác giả