Enhanced photoluminescent characteristics of Eu 3+ activated NaSr 4-x (BO 3 ) 3 phosphor for solid state lighting application

The series of Eu3+ activated NaSr4(BO3)3 phosphor was synthesized using a simple route of solution combustion technique. The crystal structure, functional group and luminescent behaviour of the phosphor were investigated using XRD, FTIR spectroscopy and photoluminescence (PL) analyses, respectively. SEM and EDX techniques were employed to study the surface morphology and elemental composition of the fabricated phosphor. The influence of doping concentration of Eu3+ on its relative emission intensity and critical distance of energy transfer was systematically investigated. The emission spectra of NaSr4-x(BO3)3:xEu3+ under 393 nm excitation consist of a main emission peak at 613 nm due to the electric dipole transition 5D0→7F2 of Eu3+. Under 613 nm emission, NaSr4-x(BO3)3:xEu3+ shows an exhibit of a strong excitation band in the region of 350–500 nm. The obtained results suggest that the synthesized phosphor could be a potential candidate for near-UV-excitable W-LEDs.