Abstract
Er3+ and Dy3+ codoped tellurite glasses have been synthesized. Five emission bands in the PL spectrum under 325 nm pumping were observed. Three of them correspond to Er3+ and the other two correspond to Dy3+, respectively. The PL spectrum revealed that the intensity of Dy3+ characteristic emission was enhanced as Er3+ concentration increased while keeping Dy3+ concentration constant. Due to small mismatch between the energy level of Er3+:4F7/2 and Dy3+:4F9/2 resonant energy was possibly transferred between them. This process can give rise to an enhancement of the PL intensity of 484 and 574 nm from Dy3+. The PL spectra of these glasses cover the blue, green and red wavelength range and the intensities of those emission bands could be controlled by adjusting the concentration of relevant rare-earth ions. These glasses with the controllable CIE coordinates might be a potential candidate for the widely realistic application such as solid-state white lighting and multicolor display.
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