Emission analysis of Pr3+ and Tm3+: Ca2Gd2W3O14 phosphors

5 mol% of Pr3+ and Tm3+ ions activated calcium gadolinium tungstate (Ca2Gd2W3O14) phosphors were synthesized by traditional solid state reaction method. Crystalline phase structure was identified from the X-ray diffraction (XRD) profiles. From the scanning electron microscopy (SEM) images, we have observed the agglomeration of the particles, and average grain size is around 40–300 nm. Using the energy dispersive X-ray analysis (EDAX) and Fourier transform infrared (FTIR) spectra, identified the elements and functional groups present in the prepared phosphors. The emission spectrum of Pr3+: Ca2Gd2W3O14 powder phosphors have shown an intense red emission at 615 nm with the excitation wavelength λexci=450 nm and thus these red color emitting powder phosphors are used as one of the components in the preparation of WLEDs. The excitation spectrum of Tm3+: Ca2Gd2W3O14 powder phosphor has shown a ligand to metal charge transfer (W–O) band (LMCT) within the WO42− group. Emission spectrum of Tm3+: Ca2Gd2W3O14 phosphors have shown blue emissions at 453 nm (1D2→3F4).