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Vol 26 No Supplementary Issue

Copyright (c) 2014 Chang Sung Lim

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Upconversion Properties of Gd2(MoO4)3:Er3+/Yb3+ Green Phosphors Synthesized via Cyclic Microwave-Modified Sol-Gel Route

https://doi.org/10.14233/ajchem.2014.19018
Chang Sung Lim
Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 356-706, Republic of Korea Corresponding author: Tel/Fax: +82 41 6601445; E-mail: cslim@hanseo.ac.kr

Corresponding Author(s) : Chang Sung Lim

Asian Journal of Chemistry, Vol 26 No Supplementary Issue

Abstract

Green phosphors of Gd2-x(MoO4)3:Er3+/Yb3+ with doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were synthesized via the cyclic microwave-assisted sol-gel route, and their upconversion properties were investigated. Well-crystallized particles, formed after heat-treatment at 900 °C for 15 h, showed a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, Gd2(MoO4)3:Er3+/Yb3+ particles exhibited a strong 525 and 550 nm emission bands in the green region, and a very weak 655 nm emission band in the red region. The Raman spectra of the particles indicated the presence of strong peaks at both higher frequencies and lower frequencies induced by the disorder of the [MoO4]2- groups with the incorporation of the Er3+ and Yb3+ elements into the crystal lattice or by a new phase formation.

Keywords

Upconversion Green phosphors Microwave sol-gel Raman spectroscopy.
Sung Lim, C. (2014). Upconversion Properties of Gd2(MoO4)3:Er3+/Yb3+ Green Phosphors Synthesized via Cyclic Microwave-Modified Sol-Gel Route. Asian Journal of Chemistry, 26(27), 115–118. https://doi.org/10.14233/ajchem.2014.19018
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