Eu3+-Doped Ca2GdSbO6 Double Perovskite Phosphor for Solid-State Lighting Applications

A set of Eu3+ activated double perovskite Ca2GdSbO6 (CGSO) phosphors has been prepared using the facile high-temperature solid-state method. The phase and crystal structure of the sample was studied via XRD. Surface morphology and micrographs were obtained via FESEM images. Chemical composition and oxidation state were attributed by XPS analyses. Optical properties were investigated via UV–Visible-NIR diffuse reflectance spectroscopy (DRS). Luminescence properties were investigated by photoluminescence (PL) excitation and emission spectra. The optical band gap of the sample was calculated using the Kubelka–Munk function along with the Tauc equation. Obtained bandgap energy was 4.72 and 4.82 eV for pure CGSO and CGSO: 0.02Eu3+. Further, the PL excitation spectrum was recorded for the emission wavelength of 612 nm, while PL emission spectra were monitored for the excitation wavelength of 395 nm. Emission spectra show the characteristic peaks of the f-f transitions of the Eu3+ ion. Moreover, the photometric studies revealed high color purity (CP) of 100% and lesser required correlated color temperature (CCT) values. These observed results illustrate that the proposed phosphor could be a convenient material for solid-state lighting applications.