ODMR and triplet state kinetics of a carbazolyl substituted diacetylene crystal |
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Authors: | H Eichele M Schwoerer JU von Schütz |
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Institution: | Physikalisches Institut, Universität Bayreuth, D-8580 Bayreuth, West Germany;Physikalisches Institut, Teil 3, Universität Stuttgart, D-7000 Stuttgart 80, West Germany |
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Abstract: | Carbazolyl substituted diacetylene (DCH) monomer crystals showing phosphorescence from four traps have been investigated by optically detected magnetic resonance (ODMR) at 1.2 K. These localized triplet states are attributed to the carbazolyl side groups. Their population and depopulation rate constants and zero field splitting parameters (0.097 <|D|< 0.1002 cm?1; 0.0068 <|E|<0.0105 cm?1) have been determined. The results suggest that the traps are disturbed substituents. The proposed interaction of the trap states with an exciton band at 23926 cm?1 is supported by temperature dependent lifetime measurements. |
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