Abstract
A highly sensitive optical gas detector based on the fluorescence quenching of a squarylium dye Langmuir-Blodgett film is reported. A squarylium dye Langmuir-Blodgett film containing J aggregate deposited on a substrate emits fluorescence from the J aggregate by excitations of He-Ne laser (632.8 nm) and laser diode (750 nm). This fluorescence was observed to be quenched quickly and reversibly by the presence of NO 2 in an air atmosphere. The change in fluorescence intensity can be easily detected by an NO 2 level of only parts per billion. High sensitivity was discussed in relation to the high mobility of excited states in the J aggregate.
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