Effect of annealing and Mn doping on the photoluminescence of strontium tartrate crystals

Strontium tartrate crystals (STC) were grown in gel using the single tube diffusion method. Powder XRD and FTIR spectroscopy were used for the characterization of the crystal. The optical band-gap (Eg) of STC is found to be 5.46 eV. Photoluminescence (PL) spectra of STC are recorded at different annealing temperature and concentration of dopant Mn. The spectral peaks (λem) of strontium tartrate photoluminor lie around 417, 440, 513 and 620 nm with excitation wavelength (λexc)=379 nm. The peaks at 417, 513 and 620 nm correspond to transitions 2P1/20→2S1/2, 1D0→3P0 and 1S→3P0, respectively of Sr. The PL peak observed around 440 nm corresponds to the a4D7/2→a6S5/2 transition of Mn.