IDENTIFICATION AND OPTIMIZATION OF ADVANCED PHOSPHORS USING COMBINATORIAL LIBRARIES

A combination of thin-film deposition and physical masking steps were used to generate libraries of the rare earth activated refractory meta l oxides, Gd(La,Sr)AlOx. Systematic variation of composition and proce ssing conditions afforded tricolor phosphors with the following nomina l compositions, (Gd0.46Sr0.31)Al1.23OxF1.38:Eu-0.06(2+) (green), La0.5 Al1.5Ox:Eu-0.04(2+) (blue), and Gd0.77Al1.23Ox:Eu-0.06(2+) (red), whic h had quantum efficiencies of greater than or equal to 94%, similar or equal to 60%, and greater than or equal to 93%, respectively at lambd a(max)(ex). The high quenching temperatures (250-350 degrees C), good chromaticities and refractory nature of these phosphors are desirable features for display applications. (C) 1997 American Institute of Phys ics.