Investigation of alkali metals (A+ = K, Na, Li) co-doped with samarium ions in the eulytite-type phosphate based phosphors for the enhancement of luminescence properties

Orange-red emitting Ba3Bi2(PO4)4:Sm3+ (here after abbreviated as BaBiPO:Sm) phosphors were synthesized, and their structural, morphological, diffuse reflectance spectra (DRS) and photoluminescence properties were investigated. From the excitation spectrum for the 595 nm emission (4G5/2 → 6H7/2) of the Sm3+ ions, the 403 nm excitation band was found to have maximum intensity. Under the 403 nm excitation, the emission spectrum exhibited bands at 564, 595, 641 and 703 nm. The Rc value was calculated to be ~24.07 Å for the quenching concentration, x = 5% mole of sm3+ ions. The luminescence decay time measurement of samarium doped phosphors was carried out. In addition, the alkali metal ions K+, Na+, and Li+ were co-doped with BaBiPO:5% mole Sm3+ phosphor, and their luminescence properties were discussed. The CIE color coordinates were calculated, and the emission color of the BaBiPO:5% mole Sm3+, and the alkali co-doped phosphors were found to be placed in the orange-red region. [Display omitted] •A+ ions codoped with BaBiPO:5%moleSm3+phosphors by solid state reaction method.•The dominant emission peak at 595 nm, maximum intensity observed 5%mole Sm3+.•A+ codoped phosphors show the emission intensity following order Li > Na > K.•Among the A+ ions the Li exhibited the maximum photoluminescence intensity.•CIE color coordinates and CCT values were calculated.