Fig. 3: Photoluminescence properties and the mechanism of Li2ZnSiO4:Mn2+.
From: Mn2+-activated dual-wavelength emitting materials toward wearable optical fibre temperature sensor

a Emission spectra of Li2Zn1–xSiO4:xMn2+ (x = 0.01–0.30) and b excitation spectra of some typical Li2Zn1–xSiO4:xMn2+ (x = 0.05, 0.15, 0.30) samples. c Schematic diagram of Mn2+-Mn2+ dimer. d Temperature-dependent emission spectra of Li2Zn0.85SiO4:0.15Mn2+ upon 427 nm blue-light excitation.