Energy transfer between Dy and Eu in Dy/Eu-codoped GdMoO.

Dy-doped and Dy/Eu-codoped GdMoO phosphors were synthesized by hydrothermal method. The results of X-ray diffraction indicate that the GdMoO phosphors have crystallized with the monoclinic structure. The emission spectra exhibit emissions at 577 nm and 488 nm that corresponded to the yellow and blue emissions, respectively. The emission intensity of these bands increases with the rise of the Dy up to a particular concentration and then reduces at a higher level. The observed behaviour was explained on the basis of concentration quenching phenomena. The enhancement in the emission intensity of the Dy with the addition of Eu along with the red emission at 617 nm for Eu was noted. The energy transfer between the two rare earth ions was studied. Codoping with the trivalent Eu ions neutralized the red emission part of the phosphor. Thus, by incorporating the adequate quantity of Eu the photometric characteristics of the phosphors can be adjusted. [ABSTRACT FROM AUTHOR]