Photoluminescence properties of tellurite glasses doped Dy3Â + and Eu3Â + for the UV and blue converted WLEDs

The glasses including phosphor particles were prepared and developed to avoid the poor thermal stability of the organic encapsulants in the commercially dominant YAG: Ce3 + phosphor converted WLEDs. However, the preparation of glasses including phosphor particles with the white emission is relative complex and difficult. In this work, the tellurite glasses single doped and co-doped with Dy3 + and Eu3 + were prepared, and their photoluminescence properties were investigated. The results demonstrated that the tellurite glasses single doped with Dy3 + and Eu3 + exhibited the yellow and red emission under the excitation of UV and blue light, respectively. For the tellurite glasses co-doped with Dy3 + and Eu3 +, the energy transfer from the Dy3 + and Eu3 + ions was observed due to the electric dipole-dipole interaction, and the tunable luminescence was obtained by changing the Eu3 + concentration. The light-emitting diodes were constructed by coupling Dy3 + and Eu3 + co-doped tellurite glasses with the UV or blue chip, and the chromaticity coordinate of such LEDs can be well tuned to white light region. These results indicated that the Dy3 + and Eu3 + co-doped tellurite glasses can act as a promising candidate for the blue and UV converted WLEDs.