Up-Conversion Tuneability in Sol–Gel Derived SiO2–KYF4 Nano-Glass-Ceramics Doped with Yb3 +–Ho3 +–Tm3 +
Sol–gel derived transparent nano-glass-ceramics doped with Ho3+ and co-doped with Yb3+–Ho3+ or Yb3+ –Ho3+–Tm3+, containing cubic KYF4 nanocrystals, have been successfully synthesized
and characterized by XRD measurements. Strong red, green and blue, along with relatively weaker UV up-conversion emissions were obtained under infrared excitation. Up-conversion mechanisms have been discussed in terms of energy transfer and cross relaxation processes. An efficient white light
source was obtained in the triply-doped samples by means of an adequate concentration of rare earth doping ions, processing temperature and adjusting the pump power.
Keywords: GLASS-CERAMICS; LUMINESCENCE; RARE-EARTH-DOPED-MATERIALS; SOL–GEL TECHNIQUE; UP-CONVERSION
Document Type: Research Article
Publication date: 01 June 2013
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