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2016 Vol.26, Issue 1 Preview Page
Microwave Sol-Gel Derived NaLa(MoO4)2 Yellow Phosphors Doped with Ho3+/Yb3+ and Upconversion Photoluminescence
Chang Sung Lim†
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Korea
†Corresponding author cslim@hanseo.ac.kr (C. S. Lim, Hanseo Univ.)
January 2016. pp. 29-34
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Abstract

NaLa1-x(MoO4)2:Ho3+/Yb3+ phosphors with the correct doping concentrations of Ho3+ and Yb3+ (x = Ho3++Yb3+, Ho3+ = 0.05 and Yb3+ = 0.35, 0.40, 0.45 and 0.50) were successfully synthesized by the microwave-modified sol-gel method. Well-crystallized particles formed after heat-treatment at 900°C for 16 h showed a fine and homogeneous morphology with particle sizes of 3-5 μm. The optical properties were examined using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the UC intensities of the doped samples exhibited strong yellow emissions based on the combination of strong emission bands at 545-nm and 655-nm emission bands in green and red spectral regions, respectively. The strong 545-nm emission band in the green region corresponds to the 5S2/5F4→5I8 transition in Ho3+ ions, while the strong emission 655-nm band in the red region appears due to the 5F5→5I8 transition in Ho3+ ions. Pump power dependence and Commission Internationale de L’Eclairage chromaticity of the upconversion emission intensity were evaluated in detail.

Keywords
microwave sol-gel
double molybdate
yellow phosphor
upconversion
Raman spectroscopy
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 26
  • No :1
  • Pages :29-34
  • Received Date : 2015-09-10
  • Revised Date : 2015-12-06
  • Accepted Date : 2015-12-16
  • DOI :https://doi.org/10.3740/MRSK.2016.26.1.29
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