Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 32, Issue -, Pages 225-232Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2015.08.018
Keywords
Photocatalytic effect; TiO2-coated CaLa2(MoO4)(4):Er/Yb; Nano core-shells; Kinetics; Upconversion photoluminescence
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2014-046024]
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TiO2-coated CaLa2(MoO4)(4) and CaLa2(MoO4)(4):Er/Yb nano core-shells were successfully synthesized using two-step procedures of the microwave sol-gel and ultrasonic methods. Well-crystallized nano core-shells showed a fine and homogeneous morphology with particle sizes of 10-20 nm. The degradation efficiency for TiO2-coated CaLa2(MoO4)(4) and CaLa1.7(MoO4)(4):Er0.1Yb0.2 under visible light resulted in the order as 10 > 15 > 5 wt%. Under excitation at 980 nm, the upconversion intensities of CaLa1.7(MoO4)(4):Er0.1Yb0.2 and CaLa1.5(MoO4)(4):Er0.05Yb0.45 particles exhibited a strong 525 nm and a weak 550 nm emission bands in the green region. The CIE diagram showed a good match with yellowish green emissions. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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