Pressure dependence of singlet and triplet excitons in amorphous polymer semiconductors

Paudel, K and Moghe, D and Chandrasekhar, M and Yu, P and Ramasesha, S and Scherf, U and Guha, S (2013) Pressure dependence of singlet and triplet excitons in amorphous polymer semiconductors. In: EPL, 104 (2).

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Abstract

We present optical studies of both singlet and triplet states of a ladder-type conjugated polymer as a function of hydrostatic pressure. The pressure coefficient of the triplet-triplet absorption is smaller compared to the pressure coefficient of the singlet excitation, highlighting the more localized nature of triplet excitons. The photoluminescence and phosphorescence energies red-shift at similar rates with increasing pressure, thus giving experimental evidence for the first time that the singlet-triplet splitting remains almost a constant under high pressure until 4GPa. The diffusion length of the triplet excitons decreases to a few hundred nm at high pressures, as compared with a few micrometers at atmospheric pressure. Copyright (C) EPLA, 2013

Item Type:	Journal Article
Publication:	EPL
Publisher:	EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Additional Information:	copyright for this article belongs to EPL ASSOCIATION,FRANCE
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	08 Jan 2014 06:05
Last Modified:	08 Jan 2014 06:05
URI:	http://eprints.iisc.ac.in/id/eprint/48155

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