Intense green‐, red‐emitting Tb³⁺, Tb³⁺/Bi³⁺‐doped and Sm³⁺, Sm³⁺/La³⁺‐doped Ca₂Al₂SiO₇ phosphors

Abstract

Abstract This paper focuses on an optical study of a Tb 3+ /Bi 3+ ‐doped and Sm 3+ /La 3+ ‐ doped Ca 2 Al 2 SiO 7 phosphor synthesized using combustion methods. Here, Ca 2 Al 2 SiO 7 :Sm 3+ showed a red emission band under visible light excitation but, when it co‐doped with La 3+ ions, the emission intensity was further enhanced. Ca 2 Al 2 SiO 7 :Tb 3+ shows the characteristic green emission band under near‐ultraviolet light excitation wavelengths, co‐doping with Bi 3+ ions produced enhanced photoluminescence intensity with better colour tunable properties. The phosphor exhibited better phase purity and crystallinity, confirmed by X‐ray diffraction. Binding energies of Ca(2p), Al(2p), Si(2p), O(1s) were studied using X‐ray photoelectron spectroscopy. The reported phosphor may be a promising visible light excited red phosphor for light‐emitting diodes and energy conversion devices.