Y6+x/3Si11−yAlyN20+x−yO1−x+y:Re3+ (Re = Ce3+, Tb3+, Sm3+) phosphors identified by solid-state combinatorial chemistry

Abstract

Solid-state combinatorial chemistry was implemented to develop new oxynitride phosphors for use in white light-emitting diodes. A two-step, high-throughput screening was implemented in a YN–AlN–SiN_4/3 ternary system that was based on random choices. We pinpointed a host structure, Y_6+x/3Si_11−yAl_yN_20+x−yO_1−x+y (x = 0.939, y = 2), the refined structure of which was a trigonal (P31c) with lattice parameters a = b = 9.84196(6) Å, c = 10.68317(6) Å, α = β = 90°, and γ = 120°. Y_6+x/3Si_11−yAl_yN_20+x−yO_1−x+y:Re³⁺ (Re = Ce³⁺, Tb³⁺, Sm³⁺) phosphors exhibited an acceptable emission in the green to red color range at blue or ultraviolet excitations.