Investigation on spectroscopic properties of Dy3+, Sm3+ co-doped K4Ca(PO4)2 phosphor.

[Display omitted] • Dy3+, Sm3+ co-activated K 4 Ca(PO 4) 2 phosphors made via Co-precipitation are pure, nano-sized, and suitable for luminescence. • UV excited singly doped ions show peaks transitioned 4F 9/2 →6H 15/2 ,6H 13/2 for Dy3+ and 4G 5/2 →6H 5/2 ,6H 7/2 ,6H 9/2 for Sm3+. • Spectral overlap condition satisfied and Energy transfer occurrence is observed for Dy3+ & Sm3+ ions. • Red deficiency is minimized by substitution of Eu3+ ions as depicted in co-doped emission spectra and CIE. • Applications for warm white emitting nano phosphor may be possible in WLED's, displays and solid-state lightings. Highly luminescent K 4 Ca(PO 4) 2 : RE3+ (RE = Dy3+, Sm3+) materials were synthesized by Co-precipitation method. structural and morphological analysis depicts phase purity and nano structured particles. The study investigated the energy transfer mechanism among dopant ions and examined the impact of concentration on luminescence. Photoluminescence (PL) spectrum analysis revealed that upon near-ultraviolet excitation, K 4 Ca(PO 4) 2 : Dy3+, Sm3+ emission assigned to transitions of different Characteristic peaks observed in region spanning 480 to 650 nm. Furthermore, photometric properties were investigated suggesting synthesized phosphor have application in preparation of white LEDs. [ABSTRACT FROM AUTHOR]