Luminescence and ODMR studies of X-traps for triplet excitons in organic crystals

Luminescence and ODMR studies of X-traps for triplet excitons in organic crystals

Avdeenko, A.A. ; Buravtseva, L.M. ; Gorobchenko, V.S. ; Eremenko, V.V. ; Izvekov, S.V. ; Kravchenko, A.E. ; Pyshkin, O.S. ; Sugakov, V.I.

Інший ID: PACS: 71.55.Ht, 76.70.Hb, 78.55.Kz

URI: http://dspace.nbuv.gov.ua/handle/123456789/175038

Посилання: Luminescence and ODMR studies of X-traps for triplet excitons in organic crystals / A.А. Avdeenko, L.М. Buravtseva, V.S. Gorobchenko, V.V. Eremenko, S.V. lzvekov, А.Е. Кravchenko, О.S. Pyshkin, and V.І. Sugakov // Физика низких температур. — 1997. — Т. 23, № 3. — С. 334-337. — Бібліогр.: 20 назв. — англ.

Підтримка: The research described in this publication was made possible, in part, bу Grants U9JOOO and U9J200 from the International Science Foundation and Grant ISSEP SPU 04265 from the Soros Science Education Program of the International Renaissance Foundation.

Дата: 1997

Завантажень: 303

Luminescence and ODMR studies of X-traps for triplet excitons in organic crystals

Анотація:

The excited triplet states of shallow X-traps in neat single crystals of 4,4-dichlorobenzophenone were studied at liquid helium temperature by luminescence spectroscopy and magnetic resonance with optical detection. The vibrational phosphorescence bands, the polarization of phosphorescence spectra, and the triplet zero-field splitting parameters of these traps have been analyzed. A specific model of the structure defect (a molecule is turned by 180° on its long axis) has been considered in organic crystals of benzophenone type which consist of molecules whose dipole moments compensate each other in a unit cell. The calculated depth of such a dipole X-trap for triplet excitons in 4,4-dichlorobenzophenone crystals at the account of a defect molecule relaxation upon its slewing was found to be comparable with the experimental one.

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