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Thermally stable double perovskite Ca2YTaO6: Tb3+, Eu3+ phosphor for warm white LEDs

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Abstract

A series of single-phase double perovskite Ca2YTaO6: Tb3+, Eu3+ phosphors were successfully synthesized by means of a high-temperature solid-state method. The crystal structure, luminescence spectrum, decay lifetime, thermal stability and energy transfer properties were investigated in detail. Under the excitation of 250 nm, Ca2YTaO6: Tb3+, Eu3+ had notable green and red light emissions at 551 nm and 618 nm, respectively. The optimal doping concentration of Tb3+ was 16 mol%. Owing to the energy transfer effect between Tb3+ and Eu3+, a tuneable luminescence from green to yellow was realized with the increase in Eu3+ doping concentration. When the temperature of the phosphor was increased from 300 to 500 K, the emission intensity remained 75% of that at room temperature. The Ca2Y0.82TaO6: 0.16Tb3+, 0.02Eu3+ phosphor was encapsulated with a 365 nm chip, and a warm white LED with CIE colour coordinates (0.365, 0.371) and low colour temperature (CCT < 5000 K) was successfully prepared.

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The data are available from the corresponding author on reasonable request.

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Funding

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51702051 and 51902054), Natural Science Foundation of Guangdong province (Grant No. 2017A030313307) and Foshan inorganic micro-nano luminescent materials engineering technology research center.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Foshan University, Foshan, 528200, China

    Jian-tao Lü

  2. School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, China

    Jun-xian Mai, Ting Fan & Jie Liang

  3. Guangdong Key Laboratory for Hydrogen Energy Technologies, Foshan, 528000, China

    Jun-xian Mai, Ting Fan & Jie Liang

  4. Foshan Inorganic Micro-Nano Luminescent Materials Engineering Technology Research Center, Foshan, 528000, China

    Jun-xian Mai, Ting Fan & Jie Liang

Authors
  1. Jian-tao Lü
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  2. Jun-xian Mai
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  3. Ting Fan
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  4. Jie Liang
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Contributions

J-tL is an associate professor, contributed towards experimental operation and manuscript writing. J-xM is a Master, contributed towards experimental operation and manuscript writing. TF is a professor, contributed towards experiment and thesis conception. JL is a Master student, contributed towards experimental data analysis.

Corresponding author

Correspondence to Ting Fan.

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Lü, Jt., Mai, Jx., Fan, T. et al. Thermally stable double perovskite Ca2YTaO6: Tb3+, Eu3+ phosphor for warm white LEDs. J Mater Sci: Mater Electron 35, 231 (2024). https://doi.org/10.1007/s10854-024-11992-z

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