Radiative transitions in solid C₆₀ under UV laser and VUV synchrotron radiation

• Дата: 1995
• Автори: Terekhin, M.A., Svechnikov, N.Yu., Kolmakov, A.A., Stankevitch, V.G., Stepanov, V.A., Bezmelnitsin, V.N., Kamada, M., Tanaka, S., Kan'no, K., Ashida, M., Matsumoto, T.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1995
• Назва видання: Физика низких температур
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/174648
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Radiative transitions in solid C₆₀ under UV laser and VUV synchrotron radiation / M.A. Terekhin, N.Yu. Svechnikov, A.A. Kolmakov, V.G. Stankevitch, V.A. Stepanov, V.N. Bezmelnitsin, M. Kamada, S. Tanaka, K. Kan'no, M. Ashida, T. Matsumoto // Физика низких температур. — 1995. — Т. 21, № 7. — С. 773-780. — Бібліогр.: 36 назв. — англ.

Photoluminescent properties of pure C₆₀ thin solid films have been investigated in the emission range of 1.2-2.4 eV over a wide temperature interval under excitations with 3.7 and 36 eV photons. Dose dependence of the luminescence degradation of C₆₀ films under long-time UV and VUV irradiation has been discovered and examined at various ambient conditions. Temperature dependence of luminescence from 10 to 300 K exhibited a step-like peculiarity in the vicinity of the structural phase transition near Tc ~ 250 K, and a decrease from 13 to 10 K. Also a C₆₀ luminescence in the process of doping by neutral potassium atomic beam «in situ» at 400 K has been examined. The luminescence decay time measurements gave values of 1.2 ± 0.. I ns for a singlet excited state, and -400 microseconds for a triplet state, the latter decays non-radiatively with a probability of more than 80%. The experimental data obtained lead us to a conclusion that the intrinsic nature of luminescence in solid C₆₀ , correlates with the bulk properties which may be attributed, mainly, to self-trapped singlet excitons. The influence of the triplet state was also observable via protection against photopolymerization due to energy transfer from the excited triplet state of C₆₀ to intercalated dioxygen.