Adjustable Up-Conversion Luminescence Color in Rare Earth Co-Doped Transparent Oxyfluoride Nano-Glass-Ceramics
Transparent oxyfluoride nano-glass-ceramics with highly efficient up-conversion and adjustable color luminescence were developed in the 28SiO2·17Al2O3·28PbF2·22CdF2·0.1NdF3·xYbF3·yHoF3·zTmF3·(4.9 − x − y − z)GdF3 composition, in mol%. X-ray diffraction and transmission electron microscopy measurements revealed that heat treatments of the oxyfluoride glasses cause the homogeneous precipitation of rare-earth ions co-doped fluorite-type PbxCd1–x F2 nanocrystals of about 10 nm in diameter in the glass matrix. Under single 808 nm laser excitation, intense red, green and blue up-conversion luminescences were simultaneously observed in these transparent nanoglass-ceramics owing to the successive energy transfer from Nd3+ ions to Ho3+ and Tm3+ via Yb3+ ions. Various colors of luminescence, including bright perfect white light, can be tuned by adjusting the concentrations of the Tm3+ ions in the material. A possible energy transfer process and up-conversion luminescence mechanism in the nano-glass-ceramics are proposed and discussed.
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Document Type: Research Article
Publication date: 2010-03-01
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