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Eu3+-activated Sr3LaNb3O12 red-emitting phosphors with excellent color stability for high color rendering w-LEDs

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Abstract

A novel red-emitting phosphor Sr3LaNb3O12:Eu3+ with triclinic perovskite structure was first synthesized via the high-temperature solid-phase method. The phase purity, crystallinity, surface morphology, thermal quenching, and luminescent properties of the Sr3LaNb3O12:xEu3+ (x = 0.01–0.50 mol) phosphors were characterized. At 395-nm excitation, Sr3LaNb3O12:Eu3+ phosphor emits the strongest peak at 612 nm, ascribed to the transitions of 5D0→7F2 by Eu3+ ions. The critical energy transfer distance and optimal doping concentration of Eu3+ ions are 11.87 Å and 0.30 mol, respectively. The relative initial intensity of Sr3LaNb3O12:0.30Eu3+ just drops to 78.3% at 420 K, and the thermal quenching temperature (T0.5) is above 480 K. By calculation, the activation energy (Ea) is 0.21 eV, and the color purity of all samples is between 99.5% and 99.8%. A white light-emitting diode (w-LED) with the chromaticity coordinates of (0.331, 0.349), a good correlated color temperature (CCT) of 5451 K, and a color rendering index (Ra) of 94 was successfully fabricated. In consequence, the feasibility of niobate red-emitting Sr3LaNb3O12:Eu3+ phosphor for the white light-emitting diode was unveiled.

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The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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Acknowledgements

This work was supported by the Natural Science Foundation of Shaanxi Province (No. 2022NY-224), Chinese Universities Scientific Fund (2452020017), the Undergraduate Innovation Fund of Northwest A&F University, China (202110712190, 202110712188, S202110712707, S202010712314, S202010712006, 202010712093, X212110712337), the Guangzhou Science and Technology Project (202102080326), and Home for researchers (www.home-for-researchers.com), China.

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Authors and Affiliations

  1. College of Science, Northwest A&F University, Yangling, 712100, Shaanxi, People’s Republic of China

    Guangliang Lu, Yuchen Zhang, Yuan Wang, Yifang Lin, Kezhou Jiang, Yumeng Shao & Dan Zhang

  2. School of Chemistry and Environmental Science, Xiangnan University, Chenzhou, 423043, Hunan, People’s Republic of China

    Bin Deng

  3. College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100, Shaanxi, People’s Republic of China

    Ruijin Yu

  4. Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Xiangnan University, Chenzhou, 423043, Hunan, People’s Republic of China

    Bin Deng

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  1. Guangliang Lu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by GL, BD, YZ, YW, YL, KJ, YS, DZ, and RY. The first draft of the manuscript was written by GL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Bin Deng or Dan Zhang.

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I certify that the Guangliang Lu and other co-authors of the article “Eu3+-activated Sr3LaNb3O12 red-emitting phosphors with excellent color stability for high color rendering index w-LEDs” have no conflict of interest, financial, or otherwise.

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Lu, G., Deng, B., Zhang, Y. et al. Eu3+-activated Sr3LaNb3O12 red-emitting phosphors with excellent color stability for high color rendering w-LEDs. J Mater Sci: Mater Electron 33, 17855–17867 (2022). https://doi.org/10.1007/s10854-022-08649-0

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