Photostimulated luminescence from CaS:Eu,Sm clusters embedded in organic dye

The optical properties of rare-earth ions in an organic dye matrix have been studied because of their possible application for optical information storage. Strong IR photostimulated luminescence of CaS:Eu,Sm doped organic dye films was revealed in the sample prepared by the sol-gel method. It was found that the efficiencies of photostimulated luminescence in the CaS:Eu,Sm doped pyrazoline dye films are higher than that in the inorganic CaS:Eu,Sm materials. The grain size of the nanocrystallites, determined by X-ray diffraction, is approximately 50 nm. It was shown that the absorption spectra for organic dye films exhibit a remarkable anisotropy near a wavelength of 3 10 nm. (C) 2002 Elsevier Science B.V. All rights reserved.