Y_(6+x/3)Si_(11-y)Al_yN_(20+x-y)O_(1-x+y):Re~(3+)(Re = Ce~(3+), Tb~(3+), Sm~(3+)) phosphors identified by solid-state combinatorial chemistry

摘要

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/3)Si_(11-y)Al_yN_(20+x-y)O_(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) A, c = 10.68317(6) A, α = β = 90°, and γ = 120°. Y_(6+x/3)Si_(11-y)Al_yN_(20+x-y)O_(1-x+y):Re~(3+) (Re = Ce~(3+), Tb~(3+), Sm~(3+)) phosphors exhibited an acceptable emission in the green to red color range at blue or ultraviolet excitations.