Annihilation of the triplet excitons in the nanoporous glass matrices
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Elsevier science bv
Abstract
The spectraandkineticsoffluorescencedecayof1,2-benzanthracene(1,2-BA)molecularclusters
adsorbedinnanoporousborosilicateglasseswereinvestigated.Ithasbeenshownthatthetypeofthe
decaykineticsofdelayedfluorescenceisdeterminedbytheannihilationoftripletexcitonsincrystalline
andpercolationclusters.Theinfluenceofanexternalmagneticfieldontheannihilationrateconstantof
tripletexcitonsintheadsorbed1,2-BAmoleculeshasbeenstudied.Theresponseofthemolecular
clusterstothemagneticfieldstronglydependsontemperature,poresizeandtimescaleofthe
observation.Clusterswiththecrystalstructuredominateinthedecaykineticsoftriplet–triplet
annihilation(TTA)anddelayedfluorescenceintheinitialmicrosecondperiodoftimeafterexcitation.
Amorphousclustersdeterminetheformofdecaykineticsofdelayedfluorescenceinthemillisecond
range.Theincreaseintheporesizeandconcentrationoftheadsorbateleadtothedominanceof
crystallinecomponents.Theresultspresentedherecanbeusedtodeveloptechniquesforprobingthe
structureoftheadsorbedlayerinnanoporoussystemsexaminingtheeffectofanexternalmagneticfield
on theannihilationdelayedfluorescence(ADF)kinetics.
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Citation
Annihilation of the triplet excitons in the nanoporous glass matrices / D. A. Afanasyev[a.o.]//Journal ofLuminescence. - Amsterdam: Elsevier science bv. - 2013. - Vol.136. - p.358-364. - ISSN 0022-2313