Abstract
Phosphorescence and optically detected magnetic resonance (ODMR) studies were performed on the perprotonated triplet traps in isotopically mixed ( h 4 in d 4) 1,4-dichlorobenzene at 1.75 K. We find evidence for two distinct crystalline phases of the d 4 host crystal which are stable in temperature ranges near room temperature, each of which induces a distinct set of ODMR parameters on the trap species being monitored. Both cw and pulsed ODMR are used to probe for evidence of trap-to-trap triplet energy transfer at several trap concentrations. We find that at low concentrations ODMR signals are strong, and the excitations are definitely localized. At concentrations above 9%, both coherent and cw ODMR signals become hard to detect. The results are discussed in terms of likely mechanisms for energy exchange among the triplet traps.
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