UV and blue excited tunable emission of thermally stable Bi3+ sensitized Eu3+ doped calcium aluminozincate phosphor for photonic applications.

Left. Synthesis procedure of Bi3+ doped and Bi3+/Eu3+ co-doped CAZ phosphor. Right. Energy level diagram of Bi3+/Eu3+ co-doped CAZ phosphor. [Display omitted] • Bi3+, Bi3+/Eu3+ doped CAZ phosphor prepared by sol–gel method. • Under UV excitation, blue emission and under blue excitation red emission is achieved. • Energy transfer through dipole–dipole interaction leads to concentration quenching. • Color tunability under different excitation in the phosphors under investigation is observed. • Relatively good thermal stability of the CAZ phosphors is observed from TDPL measurements. • These studies suggest the utility of the said phosphors in photonic devices. Bi3+/Eu3+ co-driven calcium aluminozincate (CAZ) phosphor prepared by sol–gel route. Structural analysis was conducted based on X-ray diffractogram. Scanning Electron Microscope images were recorded using Carl Zeiss microscope. Luminescent traits of the said phosphors were identified using excitation and emission spectroscopy at room temperature and elevated temperature. The emission spectra recorded at room temperature under different excitations exhibit variation in spectral behavior. The Commision Internationale de-lElcairage coordinates shown in chromaticity diagram indicate the change in emission hue as pure blue, bluish red and finally pure red by varying the excitation wavelengths. The temperature dependent emission spectra show decrease in emission intensity with temperature and activation energy found to be 0.280 eV. The decay curves were also recorded to determine lifetime and study energy transfer between Bi3+ and Eu3+ ions. Auzel's fit conducted based on the decay lifetimes helps in evaluating quantum efficiency theoretically. All these investigations authorize the potential of Bi3+/Eu3+ doped CAZ phosphors for their utilization as color-tunable phosphor in photonic applications. [ABSTRACT FROM AUTHOR]