IDENTIFICATION OF A BLUE PHOTOLUMINESCENT COMPOSITE-MATERIAL FROM A COMBINATORIAL LIBRARY

A quaternary combinatorial masking strategy was used in conjunction wi th photolithography to generate compositionally diverse thin-film phos phor libraries containing 1024 different compositions on substrates 2. 5 centimeters square, A parallel imaging system and scanning spectroph otometer were used to identify and characterize compositions in the li brary with interesting luminescent behavior. Optimal compositions were identified with the use of gradient libraries, in which the stoichiom etry of a material was varied continuously, This process led to the id entification of an efficient blue photoluminescent composite material, Gd3Ga5O12/SiO2. Experimental evidence suggests that luminescence in t his material may arise from interfacial effects between SiO2 and Gd3Ga 5O12.