Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3189286
Keywords
chemical sensors; distributed feedback lasers; explosives; laser beam applications; laser beams; optical sensors; organic semiconductors; semiconductor lasers; surface emitting lasers
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We report the trace vapor detection of the molecule 1,4-dinitrobenzene, a model analyte for the explosive substance 2,4,6-trinitrotoluene, via fluoresence quenching of a first generation conjugated dendrimer containing a 2,2(')-bis[9,9-di-n-hexylfluorene] core. We show that much greater sensitivity can be obtained by using the material as a surface emitting distributed feedback laser. We find that the slope efficiency of the laser is a convenient and sensitive indicator of the presence of the analyte. The slope efficiency decreases by a factor 50 in the presence of 1,4-dinitrobenzene.
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