Abstract

The Eu<sup>2+</sup>/Tb<sup>3+</sup>/Sm<sup>3+</sup> co-doped oxyfluoride glass ceramics containing Ba<sub>2</sub>LaF<sub>7</sub> nanocrystals are prepared in the reducing atmosphere. The X-ray diffraction results show that Eu<sup>2+</sup>, Tb<sup>3+</sup> and Sm<sup>3+</sup> ions are enriched into the precipitated Ba<sub>2</sub>LaF<sub>7</sub> nanophase after the annealing process. It deduces efficient energy transfers from Eu<sup>2+</sup> to Tb<sup>3+</sup> and Sm<sup>3+</sup> and intenses warm white luminescence of the glass ceramics. Comparing with the glass, the luminescence quantum yield of the glass ceramics is also enlarged by about 3 times. This demonstrates the potential white light-emitting diode application of the glass ceramics produced in this letter.

© 2012 Chinese Optics Letters

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