The z value dependence of photoluminescence in Eu2+-doped β-SiAlON (Si6−zAlzOzN8−z) with 1≤z≤4

Abstract

Eu 2+ -doped -SiAlON (Si 6-z Al z O z N 8-z ) phosphors with 1  z  4 were synthesized by gas pressure sintering. The emission spectra exhibit two broad bands with maxima at about 415 nm (violet) and 540 nm (green) under ultraviolet excitation. The green emission is dominant at z  2, while the violet emission becomes dominant at z > 2. The combination of two emission bands in a compound could lead to a white emission in Eu 2+ -doped -SiAlON with 2 < z  3.

Crystal structure of Eu-doped magnetoplumbite-type lanthanum aluminum oxynitride with emission site splitting

“…Multi-color emission has been also reported for several phosphors doped with only Eu 2+ [8,9], where several crystallographic sites in their host structure were simultaneously substituted by Eu 2+ . Kikkawa et al reported three emission peaks at 400, 475 and 520 nm for Eu 2+ -doped AlON with an impurity phase of magnetoplumbite (MP)-type EuAl 12 O 19 [10].…”

Synthesis and photoluminescence of blue-emitting 15R-sialon:Eu2+ phosphors

“…In addtion, a broad emission band peaking at 527 nm is also present. Our previous studies revealed that the Eu 2+ -doped ␤-sialon with z = 4 exhibits a violet emission band peaking at 409 nm [28]. Thus, the decomposed emission band peaking at 408 nm is believed to result from the ␤-sialon present also as a major phase in the product obtained at 1700 • C (Fig.…”

Synthesis and crystal structure of K2NiF4-type novel Gd1+xCa1−xAlO4−xNx oxynitrides

“…The optical properties of the oxynitrides in the UV-vis range have been explained by the coexistence of nitride and oxide anions together because of the more covalent nature in nitride ion [13]. Much research on phosphor materials for LED applications has been conducted on silicon oxynitride and alumino-silicon oxynitrides as host materials [14][15][16]. However, study on (oxy)nitrides of especially aluminum is limited to systems such as AlN:Eu, spinel-type AlON:Mg,Mn, and BaAl 11 O 16 N:Eu [17][18][19].…”