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2016 Vol.26, Issue 12 Preview Page
Microwave Sol-Gel Process for Microcystalline Ho3+/Yb3+/Tm3+ Tri-Doped NaY(WO4)2 Phosphors and Their Upconversion Photoluminescence Properties
Chang Sung Lim†
Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 31962, Republic of Korea
†Corresponding author E-Mail : cslim@hanseo.ac.kr (C. S. Lim, Hanseo Univ.)
December 2016. pp. 757-763
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Abstract

Ho3+/Yb3+/Tm3+ tri-doped NaY1-x(WO4)2 phosphors with proper doping concentrations of Ho3+, Yb3+ and Tm3+ (x = Ho3+ +Yb3+ +Tm3+, Ho3+ = 0.04, 0.03, 0.02, 0.01, Yb3+ = 0.35, 0.40, 0.45, 0.50 and Tm3+ = 0.01, 0.02, 0.03, 0.04) were successfully synthesized via the microwave sol-gel route, and their upconversion properties were investigated. Well-crystallized microcrystalline particles showed fine and homogeneous microcrystalline morphology with particle sizes of 1-2 μm. The optical properties were comparatively examined using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the doped particles exhibited white emissions based on blue, green and red emission bands, which correspond to the 1G4→ 3H6 transitions of Tm3+ in the blue region, the 5S2/ 5F4→ 5I8 transitions of Ho3+ in the green region, the 5F5→ 5I8 transitions of Ho3+, and the 1G4→ 3F4 and 3H4→ 3H6 transitions of Tm3+ in the red region. The pump power dependence of the upconversion emission intensity and the Commission Internationale de L'Eclairage chromaticity coordinates of the phosphors were evaluated in detail.

Keywords
microwave sol-gel
phosphors
white emission
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 :12
  • Pages :757-763
  • Received Date : 2016-10-24
  • Revised Date : 2016-11-15
  • Accepted Date : 2016-11-16
  • DOI :https://doi.org/10.3740/MRSK.2016.26.12.757
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