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Temperature-dependent Photoluminescence Properties of Eu2+-doped CaMgSi2O6 Phosphors
Tung-Lung Wu1, Guoxiang Peng2, Wei-Ren Zhang3 and Cheng-Fu Yang4*
1School of Mechanical and Automotive Engineering, Zhaoqing University, Zhaoqing, Guangdong 516260, China
2School of Ocean Information Engineering, Jimei University, Xiamen, Fujian 361021, P.R. China
3Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan
4Department of Aeronautical Engineering, Chaoyang University of Technology, Taichung 413, Taiwan
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Abstract:
The solid-state reaction method was used to synthesize 0.025Eu2+-doped CaMgSi2O6 (Eu-CaMgSi2O6) powder in the reduction atmosphere of 5% H2 + 95% N2 at 1300oC with a duration of 4 h. The reduction atmosphere was removed when the temperature was down to 800oC. The XRD pattern showed that only the CaMgSi2O6 phase was observed in synthesized 0.025Eu2+-doped CaMgSi2O6 powder. Room-temperature photoluminescence excitation (PLE) and photoluminescence (PL) spectra of Eu-CaMgSi2O6 phosphors were recorded by using the Hitachi F-4500 fluorescence spectrophotometer at wavelength ranges of 200–430 and 350–600 nm, respectively. A new important finding is that the synthesized Eu-CaMgSi2O6 phosphor has three important PLE wavelengths. Therefore, Eu-CaMgSi2O6 phosphors are measured from 25oC (room temperature) to 200oC under three different PLE wavelengths to find the effect of temperature on the variations of maximum photoluminescence intensities (PLmax). All the PL spectra show that only one emission band with a central wavelength of 449 nm is found, which is independent of the PLE wavelengths and is caused by the transition of 4f7 → 4f65d1. Another important finding is that the different PLE wavelengths have an apparent effect on the PLmax value of the Eu-CaMgSi2O6 phosphor. Finally, the decay-time curves of Eu-CaMgSi2O6 phosphor under three PLE wavelengths are also investigated.
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Keywords: Photoluminescence properties, CaMgSi2O6, Phosphor, Reduction atmosphere
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Received:July 20, 2022; Revised:August 08, 2022; Accepted:August 20, 2022; Published:September 30, 2022
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*Corresponding author; e-mail: cfyang@nuk.edu.tw
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Citation:Wu, T.L.; Peng, G.; Zhang, W.R.; Yang, C.F.Temperature-dependent Photoluminescence Properties of Eu2+-doped CaMgSi2O6 Phosphors. Applied Functional Materials 2022, 2, 30-36. https://doi.org/10.35745/afm2022v02.03.0004
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Copyright: ©
2022
The Author(s). Published with license by IIKII, Singapore. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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