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Vol 26 No Supplementary Issue

Copyright (c) 2014 S.S. Al-Taweel

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Preparation of KLa(MoO4)2:Er3+/Yb3+ Phosphors by Cyclic Microwave-Modified Sol-Gel Method and Their Upconversion Properties

https://doi.org/10.14233/ajchem.2014.19017
S.S. Al-Taweel
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) : S.S. Al-Taweel

Asian Journal of Chemistry, Vol 26 No Supplementary Issue

Abstract

The double molybdate KLa1-x(MoO4)2:Er3+/Yb3+ phosphors with the doping concentrations of Er3+ and Yb3+ (x = Er3+ + Yb3+, Er3+ = 0.05, 0.1, 0.2 and Yb3+ = 0.2, 0.45) were successfully synthesized by a cyclic microwave-modified sol-gel method and the upconversion properties have been investigated. Well-crystallized particles were formed after heat treatment at 900 °C for 16 h, showing a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, the synthesized particles exhibited a strong 525 nm emission band and a weak 550 nm emission band in the green region and a weak 655 nm emission band in the red region. The Raman spectra of the particles indicated the strong peaks at higher frequencies and weak peaks at lower frequencies.

Keywords

Double molybdates Phosphors Cyclic microwave sol-gel Upconversion.
Al-Taweel, S. (2014). Preparation of KLa(MoO4)2:Er3+/Yb3+ Phosphors by Cyclic Microwave-Modified Sol-Gel Method and Their Upconversion Properties. Asian Journal of Chemistry, 26(27), 95–99. https://doi.org/10.14233/ajchem.2014.19017
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