Significantly enhanced photoluminescence and thermal stability of La₃Si₈N₁₁O₄:Ce³⁺,Tb³⁺ via the Ce³⁺ → Tb³⁺ energy transfer: a blue-green phosphor for ultraviolet LEDs.

ABSTRACT: A series of Ce³⁺-, Tb³⁺- and Ce³⁺/Tb³⁺-doped La₃Si₈N₁₁O₄ phosphors were synthesized by gas-pressure sintering (GPS). The energy transfer between Ce³⁺ and Tb³⁺ occurred in the co-doped samples, leading to a tunable emission color from blue to green under the 360 nm excitation. The energy transfer mechanism was controlled by the dipole-dipole interaction. The Ce³⁺/Tb³⁺ co-doped sample had an external quantum efficiency of 46.7%, about 5.6 times higher than the Tb-doped La₃Si₈N₁₁O₄ phosphor (8.3%). The thermal quenching of the Tb³⁺ emission in La₃Si₈N₁₁O₄:Tb,Ce was

SUBMITTER: Xu HB 

PROVIDER: S-EPMC9087639 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature