Abstract: The quaternary discrete combinatorial material chip approach was used to optimize new phosphors Gd_3(1-x)Al₅O₁₂:RE_3X.And we got the activator-and-sensitizer-screening results from Gd₃Al₅O₁₂-matrix phosphors material chip as follows: 1) Gd_3(1-x)Al₅O₃:Eu_3x showed red photoluminescence;2) when Pr or Ce was co-doped(n(Pr):n(Eu)<1:10,n(Ce):n(Eu)<1:10),it would decrease the phosphor's luminescence intensity.Spectrum analysis showed that there was resonant energy transfer between Eu and RE by the absorbing or emitting low energy phonons while the Pr or Ce energy level was adding.And this was the main reason for Gd₃Al₅O₁₂: Eu luminescence intensity decreasing.The material chip screening result was also verified by the powder samples,which were produced by nitric-citric process.The experimental work proved the combinatorial material chip approach is an efficient innovation for material research.

Key words: combinatorial, gadolinium-aluminum, luminescence, citrate-nitrate combustion, resonant energy transfer