Abstract
Ce 3+–Eu 2+–Dy 3+–Eu 3+-doped fluorosilicate glass ceramics containing orthorhombic CaCeOF 3 nanocrystals were prepared by annealing the precursor glass above 640 °C, along with the reduction of Eu 3+ → Eu 2+. Under near ultraviolet excitation, the emission bands of Eu 2+ or Dy 3+ were enhanced by several ten or hundred times, owing to energy transfers from Ce 3+ to Eu 2+ or Dy 3+. The glass and glass ceramics emitted warm white light deriving from the blue, yellow and red emission from Eu 2+, Dy 3+ and Eu 3+. Tuning the annealing temperature, the Eu 2+/Eu 3+ ratio and the warm white Commission Internationale de I’Eclairage (CIE) coordinates can be adjusted. Thus, the present materials can be applied on warm white high power light-emitting-diodes for indoor illumination application.
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