Exploration of efficient photoluminescence properties of intense green emitting Er³⁺ activated NaBi(MoO₄)₂ phosphor for white LED applications

Microcrystalline NaBi(MoO4)2 (NBM) phosphors doped with rare-earth ions (Er3+) have been successfully synthesized via conventional solid-state reaction route. The crystal structure, morphology, photoluminescence (PL), and colorimetric properties of NBM: xEr(3+) samples were explored using various characterization techniques. X-ray diffraction patterns of the as-synthesized phosphors were well-matched with the standard JCPDS (card no. 79-2240) patterns. The peaks centered at 530 (H-2(11/2)-> I-4(15/2)) and 552 nm (S-4(3/2)-> I-4(15/2)) in photoluminescence (PL) spectra were observed for NBM: Er3+ phosphor under 488 nm excitation. The concentration quenching phenomenon in the NBM phosphor was attained at 2.0 mol% of Er3+ ion concentration, beyond which it declines the emission intensity. Colorimetric properties of the Er3+ activated NBM samples were explored through CIE coordinates, which fall in the green region and indicate high color purity. The aforementioned characteristics demonstrate promising behavior of NaBi(MoO4)2: xEr(3+) phosphor to use in the field of solid-state lighting applications