A new apparatus has been constructed to eliminate the self-absorption effect from dispersed emission spectra. Droplets of solution smaller than 5 &mgr;m in diameter were generated by ultrasonic vibration from bulk solution, and irradiated with a laser to observe dispersed emission spectra. Effective suppression of self-absorption was demonstrated using ethanol droplets containing rhodamine 640 dye. A slight increase in the ambient temperature—less than 10°—gave rise to a release of solvent molecules from droplets, and consequently, the size of the droplets drastically decreased. Emission spectra over a wide range of concentrations were observed by the method of solvent release. The change of the ratio between monomer/excimer fluorescence from pyrene was clearly shown using droplets generated from solution with single concentration. Effective concentrations and the sizes of droplets at different temperatures were determined from comparison to the results obtained by droplets with different concentrations. The concentration of droplets warmed up to 305 K and was 29 times that of droplets at 297 K. ©1997 American Institute of Physics.