A spectroscopic study of water-soluble pyronin B and pyronin Y in Langmuir-Blodgett films mixed with stearic acid

► Langmuir-Blodgett (LB) films of pyronin dyes mixed with stearic acid were executed. ► The formation of mixed LB film was checked by using surface pressure-area (π-A) isotherms. ► Photophysical properties of pyronin dyes were investigated by spectroscopic techniques. ► Morphological investigation of the LB film was performed with Atomic Force Microscopy.