Effect of nanoscale dielectric environments on concentration quenching
Author:
Rout Sangeeta1ORCID, Koutsares Samantha R.1, Courtwright Devon1, Mills Ezekiel2, Shorter Ayanna1, Prayakarao Srujana1, Bonner Carl E.1, Noginov Mikhail A.1
Affiliation:
1. Center for Materials Research, Norfolk State University , Norfolk , VA 23504 , USA 2. Virginia State University , Petersburg , VA 23806 , USA
Abstract
Abstract
We have studied the dependence of concentration quenching of luminescence (donor–acceptor energy transfer) on the thickness d of dye-doped polymeric films (HITC:PMMA) and found its strong inhibition at small values of d. This phenomenon is tentatively explained by a limited number of acceptors, which donors’ excitation can reach in thin samples, if the film’s thickness is comparable to the diffusion length of the energy transfer. The latter mechanism, along with effective reduction of the dye concentration, is responsible for an inhibition of the concentration quenching of dye molecules impregnating porous alumina membranes. The elongation of emission kinetics in thick (≥3 μm) HITC:PMMA films is cautiously attributed to the samples’ crystallinity.
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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