“…The typical PLE and PL spectra of the CGS:0.6%Mn 4+ phosphors were illustrated in Figure A,B, as the optimal doping concentration was 0.6 mol%. When monitored at 676 nm, the sample exhibited two broad PLE bands within 250‐600 nm wavelength range, which can be fitted by four Gaussian curves with the peak at 306, 358, 409, and 495 nm arising from Mn‐O charge transfer band, 4 A 2g → 4 T 1g , 4 A 2g → 2 T 2g , and 4 A 2g → 4 T 2g transitions of Mn 4+ ions, respectively . It was worth noting that the peaks attributed to the 4 A 2g → 4 T 1g and 4 A 2g → 4 T 2g transitions were strong, meaning that the phosphors can be efficiently excited by both near–UV and blue lights.…”