Intermolecular states in organic dye dispersions: excimers vs aggregates

A. J. Musser, Sai Kiran Rajendran, K. Georgiou, L. Gai, R. T. Grant, Z. Shen, M. Cavazzini, Arvydas Ruseckas, Graham Alexander Turnbull, Ifor David William Samuel, J. Clark, D. G. Lidzey

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)
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Abstract

Rapid excited-state quenching in the solid state is a widespread limitation for organic chromophores. Even when molecules are dispersed in neutral host matrices, photoluminescence quantum yields decrease sharply with increased concentration, pointing to efficient intermolecular non-radiative decay pathways that remain poorly understood. Here we study the nature of the intermolecular states formed in dispersions the prototypical BODIPY dyes. Using temperature-dependent and time-resolved photoluminescence measurements, we describe the processes of energy transfer into excimer states and, in materials with suitable chemical structure, excitonically coupled dimers. These dimer states exhibit remarkable near-unity quantum yield.
Original languageEnglish
Pages (from-to)8380-8389
Number of pages10
JournalJournal of Materials Chemistry C
Volume5
Issue number33
Early online date5 Jul 2017
DOIs
Publication statusPublished - 7 Sept 2017

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