Characterization of Al2O3 : Eu3+ luminescent coatings prepared by spray pyrolysis technique

Europium doped Al2O3 photoluminescent coatings have been prepared by an ult rasonic spray pyrolysis process, using a solution of 0.05M of AlCl3 . 6H(2) O as starting material and EuCl3 as doping. These films were deposited on P yrex grass substrates at atmospheric pressure using purified air as a carri er gas. All films were amorphous in structure. The photoluminescence spectr a were measured at room temperature as a function of substrate temperature and doping concentration. For an excitation wavelength of 395 nm, all the p hotoluminescent spectra show bands located at 587, 600, 612 and 648 nm, cha racteristics of the trivalent europium ion. We observed a concentration que nching of the photoluminescence at values of activator concentration above 10 at% in the starting solution.