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Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals

Enhancement of ODMR Effect in a System of Triplet Excitons at Threshold of Annihilational Bistability in Organic Crystals Containing Traps

I. Yu. Goliney, V. I. Sugakov

Published Jul 1, 1995• 1 citation
Publisher

Abstract

It is shown that the sensitivity of a system of triplet excitons in organic crystals to microwave radiation under conditions that give rise to the development of a annihilational bistability significantly increases. A possibility to change intensity of crystal phosphorescence by an order of magnitude by applying microwave field resonant to the transitions between spin sublevels of trapped excitons has been demonstrated.

DOI
10.1080/10587259508031000

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It is shown that the sensitivity of a system of triplet excitons in organic crystals to microwave radiation under conditions that give rise to the development of a annihilational bistability significantly increases. A possibility to change intensity of crystal phosphorescence by an order of magnitude by applying microwave field resonant to the transitions between spin sublevels of trapped excitons has been demonstrated.
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The optical bistability of a four-level system with triplet-state absorption typical of organic media is studied. We derive the state equation of optical bistability with triplet-state absorption. Different bistabilities with resonant absorption or dispersion of the triplet state are numerically discussed. The effects of the cooperativity parameter and the atomic- and cavity-detuning parameters on optical bistable behavior are analyzed. It is found that the hysteresis loops decrease with an increase of both the cooperativity parameter and the atomic-detuning parameter of the triplet state and that under some conditions reverse saturable-absorptive media can display bistability.
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The effect of a magnetic field on the development of the nonlinear absorption in organic semiconductors and on the formation of the hysteresis loop in the incoming-outgoing light intensity dependence has been investigated. The form function of the exciton absorption is calculated, taking into account three factors: the heavy exciton density, the polarization of the excitation wave and the weak magnetic field. It is shown that an appropriate change of these values allows one to form a hysteresis loop, and thus to form optical bistability (OB) with preset parameters.