Photoluminescence and thermal stability of Mn2+ co-doped SrSi2O2N2:Eu2+green phosphor synthesized by sol-gel method

(a) Photoluminescence excitation and emission spectra of Sr0.97−xSi2O2N2:0.03Eu2+, xMn2+ with x = 0−0.04. (b) Temperature dependence of the normalized PL intensity of Sr0.97−xSi2O2N2:0.03Eu2+, xMn2+ (x = 0−0.03) and commercial phosphors YAG:Ce3+.