Photoluminescence and Optical Studies of a Temperature Sustainable Dy3+ Doped Silicate Phosphor for Photonic Applications

A 0.30 mol% Dy3+ ion-activated potassium calcium silicate (K4CaSi3O9) (KCS) phosphor was prepared using a conventional solid-state synthesis approach. The powder X-ray diffraction study is used for the confirmation of phase in the as-prepared Dy3+ ions doped phosphor. The optical band gap was deduced from the Diffused Reflectance Spectra (DRS) with a typical value of 3.8 eV. A systematic study of Photoluminescence (PL) properties was carried out to characterize the phosphors. When excited with 350 nm, the PL spectrum of the as-synthesized phosphor shows intense blue emission along with yellow and a less intense red emission. The PL spectral information is used to evaluate the CIE-1931 color chromaticity parameters in the white region. From the temperature-dependent PL spectral data, the activation energy has been estimated using the Arrhenius equation, which ensures the thermal strength of the as-prepared Dy3+ ions doped phosphor material. All the results mentioned above reveal the capability of the as-synthesized KCS:Dy3+ phosphor for photonic appliances such as w-LEDs.