Abstract
Eu3+-doped germanate based red emitting phosphors SrGe4O9: xEu3+ (0 ≤ x ≤ 0.5 mol%) were prepared by high-temperature solid-state procedure. Moreover, the Density Functional Theory (DFT) calculation, X-ray diffraction (XRD) Rietveld refinement, scanning electron microscopy (SEM), and photoluminescence (PL) measurement were discussed in detail to fully investigate the crystal structure and PL properties of SrGe4O9: xEu3+. Furthermore, the Judd–Ofelt (J–O) analysis demonstrated that the Eu3+ ions in the SrGe4O9 host possessed lower sites symmetry. In addition, the phosphor SrGe4O9: 0.35%Eu3+ displayed superior thermal stability with PL intensity at 423 K is around 90% of its initial value at 298 K. As a result, the white light emitting diodes (WLED) device based on SrGe4O9: 0.35%Eu3+ achieved an expected result of a correlated color temperature (CCT) of 4573 K and a color rendering index (CRI) of 80.8 under a voltage of 3 V and a driven current of 20 mA.
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Acknowledgements
This work is financial supported by the Scientific Research Fund of Hunan Provincial Education Department (Nos. 18B450 and 18C0886); the Open Foundation of Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials (No. TC201704); the double first-class discipline construction program of Hunan province (NO. Xiang Jiao Tong [2018]469); the Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials (No. 2016TP1028). High performance computing center of science and engineering of Sichuan University of Science and Engineering is gratefully acknowledged for DFT studies.
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Ji, C., Li, L., Huang, Z. et al. Eu3+-doped SrGe4O9 red emitting phosphors: structural, luminescence properties, theoretical calculation and applications. Appl. Phys. A 126, 158 (2020). https://doi.org/10.1007/s00339-020-3329-7
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DOI: https://doi.org/10.1007/s00339-020-3329-7