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Sensitive Explosive Vapor Detection with Polyfluorene Lasers

Research output: Contribution to journalArticle

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Abstract

Distributed feedback organic semiconductor lasers based on polyfluorene are shown to be suitable for use as chemical sensors for the detection of nitroaromatic-based explosive vapors. The laser threshold is increased by a factor of 1.8 and the slope efficiency is reduced by a factor of 3 after exposure to the vapor. The sensing efficiency depends strongly on the excitation energy with a maximum efficiency of 85%. The temporal dynamics of the laser response to the analyte have been investigated. The laser emission falls to 60% of its initial value in 46s. A model is developed to offer some insight into the diffusion of the vapor molecules inside the polymer layer.

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Original languageEnglish
Pages (from-to)2093-2097
Number of pages5
JournalAdvanced Functional Materials
Volume20
Issue number13
DOIs
StatePublished - 9 Jul 2010

Research areas

  • DISTRIBUTED-FEEDBACK LASER, CASE-II DIFFUSION, CONJUGATED POLYMERS, CONDUCTING POLYMER, OPTICAL GAIN, SPECTROSCOPY, SENSORS, FILMS, DYE

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