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Molten salt synthesis and luminescence properties of Sm3+ doped K2LaNb5O15 niobate phosphor

BING HAN1,* , YAWEI CHEN1, BEIBEI LIU1, JIE ZHANG1

Affiliation

  1. School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, People’s Republic of China

Abstract

A series of polycrystalline powders Sm3+ doped K2LaNb5O15 niobate phosphors were synthesized by molten salt method, and their phase purity and structures were investigated by powder X-ray diffraction. The as-prepared K2LaNb5O15:Sm3+ samples exhibited a single phase tetragonal tungsten bronze (TTB) structure. Upon excitation with 407 nm, these phosphors presented orange-red emission and millisecond-level lifetime due to the intra-4f transitions of Sm3+ ions. According to the concentration dependent photoluminescence properties of the as-prepared phosphors, the optimal concentration of Sm3+ was confirmed to be 4%, and the concentration quenching phenomenon was originated from dipole–dipole interaction between Sm3+ ions. The results indicate the molten salt method is an efficient method to prepare K2LaNb5O15-based phosphors at relatively low temperature, and K2LaNb5O15:Sm3+ phosphor may be potential orange-red phosphor for solid state lighting..

Keywords

Molten salt, Niobate; Sm3+, Luminescence.

Submitted at: Jan. 25, 2021
Accepted at: April 8, 2022

Citation

BING HAN, YAWEI CHEN, BEIBEI LIU, JIE ZHANG, Molten salt synthesis and luminescence properties of Sm3+ doped K2LaNb5O15 niobate phosphor, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 3-4, pp. 140-145 (2022)