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Vol. 27 No. 1 (2015): Vol 27 Issue 1

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Cyclic Microwave-Assisted Sol-Gel Process of SrGd2(MoO4)4:Er3+/Yb3+ Phosphors and Their Upconversion Mechanisms by Two-Photon Process

https://doi.org/10.14233/ajchem.2015.17405
Chang Sung Lim
Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 356-706, Republic of Korea

Corresponding Author(s) : Chang Sung Lim

cslim@hanseo.ac.kr

Asian Journal of Chemistry, Vol. 27 No. 1 (2015): Vol 27 Issue 1

Abstract

SrGd2(MoO4)4:Er3+/Yb3+ green phosphors with doping concentrations of Er3+ and Yb3+ have been successfully synthesized by a cyclic microwave-assisted sol-gel method and the upconversion mechanisms by a two-photon process have been investigated. Well-crystallized particles, formed after heat-treatment at 900 °C for 12 h, showed a fine and homogeneous morphology with particle sizes of 2-5 μm. Under excitation at 980 nm, SrGd2(MoO4)4:Er3+/Yb3+ particles exhibited strong 525 and 550-nm emission bands in the green region correspond to the 2H11/2 ® 4I15/2 and 4S3/2 ® 4I15/2 transitions, respectively, while the very weak 655 nm emission band in the red region corresponds to the 4F9/2 ® 4I15/2 transition. The Raman spectra of the particles indicated the presence of strong peaks at both higher frequencies (1023, 1092 and 1325 cm-1) and at lower frequencies (233, 293, 365, 428, 538 and 594 cm-1).

Keywords

Green phosphor Sol-gel Upconversion Two-photon process
Sung Lim, C. (2014). Cyclic Microwave-Assisted Sol-Gel Process of SrGd2(MoO4)4:Er3+/Yb3+ Phosphors and Their Upconversion Mechanisms by Two-Photon Process. Asian Journal of Chemistry, 27(1), 277–281. https://doi.org/10.14233/ajchem.2015.17405
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