{"title":"The Manifestation of Spin-Selectivity of the Singlet Exciton Decay into a Pair of Triplets in the Kinetics of the Exciton Decay in Rubrene Films","authors":"A. I. Shushin, S. Ya. Umanskii","doi":"10.1134/S1990793124701483","DOIUrl":null,"url":null,"abstract":"<p>The kinetics of singlet fission (SF) (i.e., spontaneous splitting of the excited singlet state into a pair of triplet (T) excitons (TT-pair)) is known to be significantly affected by TT-annihilation (TTA), which manifests itself in magnetic field effects on the TTA and, in particular, in the magnetic-field dependence of the SF-kinetics. In this study, in the two-state model (TSM), a method is proposed for treating the magnetic field effects on the SF-kinetics, which allows for the correct description of the manifestation of the stochastic migration of T-excitons assuming that the manifestation results from the transition from two states of coupled and freely diffusing T-excitons. In the TSM, the analytical expression for the magnetic-field-dependent part of the SF-kinetics is derived. This expression is applied to the analysis of the SF-kinetics measured in amorphous rubrene films in the absence of a magnetic field and in the field <i>B</i> = 8 kGs.</p>","PeriodicalId":768,"journal":{"name":"Russian Journal of Physical Chemistry B","volume":"18 6","pages":"1635 - 1640"},"PeriodicalIF":1.4000,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Physical Chemistry B","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S1990793124701483","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, ATOMIC, MOLECULAR & CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The kinetics of singlet fission (SF) (i.e., spontaneous splitting of the excited singlet state into a pair of triplet (T) excitons (TT-pair)) is known to be significantly affected by TT-annihilation (TTA), which manifests itself in magnetic field effects on the TTA and, in particular, in the magnetic-field dependence of the SF-kinetics. In this study, in the two-state model (TSM), a method is proposed for treating the magnetic field effects on the SF-kinetics, which allows for the correct description of the manifestation of the stochastic migration of T-excitons assuming that the manifestation results from the transition from two states of coupled and freely diffusing T-excitons. In the TSM, the analytical expression for the magnetic-field-dependent part of the SF-kinetics is derived. This expression is applied to the analysis of the SF-kinetics measured in amorphous rubrene films in the absence of a magnetic field and in the field B = 8 kGs.
期刊介绍：
Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.
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