Abstract
A series of Ca3TeO6:xDy3+ (x = 0.01, 0.02, 0.05, 0.10, 0.15, 0.20, and 0.25) tellurate yellow-emitting phosphors were synthesized via the high-temperature solid-state method. The X-ray diffraction patterns of these phosphors revealed that all the samples have a double-perovskite type with monoclinic structure. The Ca3TeO6:Dy3+ phosphor exhibit characteristic emission transitions, 4F9/2-6H15/2 transition and 4F9/2-6H13/2 transition, respectively. The intense yellow light indicates that Dy3+ ion occupies the interstitial Ca site in the Ca3TeO6 host. The optimal Dy3+ ion concentration was determined as 10 mol%. The critical energy transfer distance was calculated as 14 Å. The concentration quenching mechanism of Dy3+ was investigated in details. The temperature effect on photoluminescence was discussed in order to evaluate the thermal stability. The obtained results illustrate Ca3TeO6:Dy3+ was a new kind of yellow-emitting potential phosphor for WLEDs.
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