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A novel red-emitting Sr7Sb2O12:Eu3+, M+ (M = Li, Na, K) phosphor for warm white LED: synthesis, optical properties, and LED fabrication

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Abstract

Novel red phosphors Sr7Sb2O12:Eu3+ and Sr7Sb2O12:Eu3+, M+ (M = Li, Na, K) were synthesized via a high temperature solid-state method and their luminescent properties were investigated to figure out the promising application in warm white light-emitting diodes (LED). The phase structure, crystal morphology, luminescence properties, luminescence decay lifetime, thermal stability and chromaticity coordinate of the as-synthesized phosphors were investigated in detail. Sr7Sb2O12:Eu3+ could be efficiently excited by the near-ultraviolet (UV) light and exhibited bright red emission around 612 nm. When co-doped with the charge compensation M+ (M = Li, Na, K) ions, the emission intensity of Eu3+ can be enhanced to some extent. The optimal Eu3+ doping concentration was determined to be about x = 0.2 and concentration quenching mechanism in Sr7Sb2O12:Eu3+ sample was attributed to the electric dipole–dipole interaction. The temperature-dependent spectra of Sr7Sb2O12:Eu3+ implied that this sample shows good thermal-stable properties. The decay lifetime of Sr7Sb2O12:0.2Eu3+ was about 1.44 ms. Combining with the red Sr7Sb2O12:0.20Eu3+, blue BaMgAl10O17:Eu2+, yellow (Ba,Sr)2SiO4:Eu2+ phosphor and a 395 nm near-UV LED chip, a white LED with low correlated color temperature (CCT = 4260 K) and high-color rendering index (Ra = 91.8) was fabricated. The overall work suggested that Sr7Sb2O12:Eu3+ phosphor is a promising red-emitting component applied in warm white LED.

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Acknowledgements

This work has been supported by the Fujian Provincial Natural Science Foundation of China (Grant No. 2020J01297), and the Science Technology innovation project of Xiamen (Grant No. 3502Z20193056).

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Authors and Affiliations

  1. Department of Optoelectronic, Xiamen University of Technology, Xiamen, 361024, Fujian, China

    W. B. Yang, F. B. Xiong, Y. Yang, H. F. Lin, X. G. Meng & W. Z. Zhu

  2. Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices, Xiamen University of Technology, Xiamen, 361024, China

    F. B. Xiong

  3. Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, 350002, China

    E. Ma

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  1. W. B. Yang
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  2. F. B. Xiong
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Yang, W.B., Xiong, F.B., Yang, Y. et al. A novel red-emitting Sr7Sb2O12:Eu3+, M+ (M = Li, Na, K) phosphor for warm white LED: synthesis, optical properties, and LED fabrication. Appl. Phys. A 128, 584 (2022). https://doi.org/10.1007/s00339-022-05664-0

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