Intensity enhancement of photoluminescence in Tb3+/Eu3+ co-doped Ca14Zn6Al10O35 phosphor for WLEDs

This article focuses on the effect of monovalent cation doping on the optical properties of rare earth (RE = Eu3+, Tb3+) co-doped Ca14Zn6Al10O35 which has been synthesized by a low temperature combustion method. Crystalline phase of the Ca14Zn6Al10O35 phosphor was examined and confirmed by X-ray diffraction measurement. Under near-ultraviolet light excitation Eu3+-doped Ca14Zn6Al10O35 phosphor exhibit characterization of Eu3+ emission bands that are located at a maximum wavelength (lambda(max)) of approximately 470 nm and other peaks centred at 593 nm and 615 nm, respectively. With Tb3+-doped Ca14Zn6Al10O35 phosphor showing a green emission band centred at 544 nm under near-ultraviolet range. Furthermore, we studied the energy transfer process in Eu3+/Tb(3+)pair and enhancement in photoluminescence (PL) intensity with doping different charge compensation. Here we obtained the optimum PL emission intensity of the phosphor in broad and intense visible spectral range which may be significant for the fabrication of white light emitting diodes (WLEDs).

Automated summary

This article investigates the impact of monovalent cation doping on the optical properties of rare earth (RE = Eu3+, Tb3+) co-doped Ca14Zn6Al10O35 synthesized through a low temperature combustion method. X-ray diffraction measurement confirms the crystalline phase of the Ca14Zn6Al10O35 phosphor. Under near-ultraviolet light excitation, Eu3+-doped Ca14Zn6Al10O35 displays Eu3+ emission bands with a maximum wavelength of approximately 470 nm, as well as peaks at 593 nm and 615 nm. Tb3+-doped Ca14Zn6Al10O35 exhibits a green emission band centered at 544 nm under near-ultraviolet range. Additionally, the energy transfer process in the Eu3+/Tb3+ pair and the enhancement in photoluminescence (PL) intensity with different charge compensation doping were studied. The obtained optimum PL emission intensity in a broad and intense visible spectral range could be significant for the fabrication of white light emitting diodes (WLEDs).