Intensity enhancement of photoluminescence in Tb 3+ /Eu 3+ co-doped Ca 14 Zn 6 Al 10 O 35 phosphor for WLEDs.

This article focus effect of monovalent cation doping on the optical properties of RE (RE = Eu 3+ , Tb 3+ ) co doped Ca 14 Zn 6 Al 10 O 35 which has been synthesized by a low temperature combustion method. Crystalline phase of the Ca 14 Zn 6 Al 10 O 35 phosphor was examined and confirm by X-ray Diffraction measurement. Under near UV light excitation Eu 3+ doped Ca 14 Zn 6 Al 10 O 35 phosphor exhibit characterization of Eu 3+ emission bands those are located at λ max ~ 470 nm and other peaks centred at 593 nm and 615 nm respectively. With Tb3+ doping Ca 14 Zn 6 Al 10 O 35 phosphor shows green emission band centred at 544 nm under NUV range. Further we studied the energy transfer process in Eu 3+ /Tb 3+ pair and enhancement in PL intensity with doping different charge compensator. 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 WLEDs.