SYNTHESIS AND CHARACTERIZATION OF SR(1-X) TEO3: XEU3+ PHOSPHORS FOR POTENTIAL SOLID-STATE LIGHTING APPLICATIONS: Synthesis and Characterization of Sr(1-x) TeO3: xEu3+ Phosphors for Potential Solid-State Lighting Applications

Pacharee Khongkitsiri; Khwanruethai Weysan; Patarawagee Yasaka; Kitipun Boonin; Winut Wongwan; Seubsakun Khondara

doi:10.55766/sujst9661

Authors

Pacharee Khongkitsiri Department of Science and Mathematics, Faculty of Industry and Technology, Rajamangala University of Technology Isan Sakon Nakhon campus, Sakon Nakhon, Thailand.
Khwanruethai Weysan Department of Science and Mathematics, Faculty of Industry and Technology, Rajamangala University of Technology Isan Sakon Nakhon campus, Sakon Nakhon, Thailand.
Patarawagee Yasaka Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
Kitipun Boonin Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand.
Winut Wongwan Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, 73000, Thailand.
Seubsakun Khondara Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, 73000, Thailand.

DOI:

https://doi.org/10.55766/sujst9661

Keywords:

Eu3+ ions, Phosphor, Photoluminescence

Abstract

The Sr_(1-x)TeO₃:xEu₂O₃ phosphors were synthesized using the conventional high-temperature solid-state reaction method at 800°C for 3 h in air atomosphere. The assynthesized phosphors were characterizated using XRD, FTIR, absorption spectra, photoluminescence, and X-ray-induced luminescence. Rigaku SmartLab-SE XRD diffractometers confirmed the crystalline nature of the phosphors. From the study, it was found that the structure of the sample was a mixture of SrTeO₃ and TeO₂. The increased concentration of Eu₂O₃ seems to contribute to the enhancement or stabilization of SrTeO₃ phase. The UV-VIS-NIR spectrophotometer in reflection mode measured the absorption spectrum, revealing six peaks corresponding to energy transitions of Eu³⁺ ions at 394, 465, 536, 592, 2,207, and 2,070 nm. Photoluminescence analysis demonstrated the strongest luminescence intensity of Eu³⁺ ions at 614 nm (⁷F₂) under 465 nm excitation, resulting in an overall red emission in the CIE 1931 chromaticity. Combining these findings, Sr_(1-x)TeO₃: xEu phosphors exhibit promising characteristics for solid-state lighting applications (SSL). The X-ray-induced luminescence shows an increase with increasing concentrations of Eu₂O₃ until 0.10%. The samples with the maximum intensity were compared with bismuth germanate oxide (BGO) crystals, which are used as radiation detectors, and were found to be as effective as 33.65% of the BGO crystals. The results demonstrate that the current samples could be a potential candidate for use in scintillator applications.

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SYNTHESIS AND CHARACTERIZATION OF SR(1-X) TEO3: XEU3+ PHOSPHORS FOR POTENTIAL SOLID-STATE LIGHTING APPLICATIONS