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Regulation of the luminescence of Bi3+-activated Ca5Ga6O14 phosphors by varying doping concentration and composition design

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Abstract

Achieving the desired color temperature and color rendering index in light sources is challenging because of the deficiency of certain color components, notably cyan in the illumination spectra. In this investigation, we successfully synthesized orthogonal Ca5Ga6O14: Bi3+ (CGO: Bi3+) phosphors with space group Cmc21, featuring two distinct Ca(1) and Ca(2) sites. Under the excitation of 335 nm, a broad cyan emission with a 495 nm peak was observed. Gaussian peak fitting revealed two sub-peaks at 445 and 500 nm, originating from the emission of Bi3+ occupying Ca(1) and Ca(2) sites, respectively. As Bi3+ doping concentration increased, the luminescence experienced a red shift, attributed to the cooperative impact of crystal field splitting and electron cloud rearrangement. Through the substitution of Sr2+ ions, we achieved a 2.15 times enhancement in emission intensity and an increase in lifetime from 0.451 to 0.551 μs. This substitution also led to a consistent increase in the relative emission percentage of Bi(1) from 46.5% to 73.1%, while that of Bi(2) decreased from 70.5% to 44.9%. It is likely a result of some Bi3+ ions originally situated in the Ca(2) site migrating to the Ca(1) site. Finally, the introduction of Na+ ions for charge compensation resulted in a 20.18% increase in the luminescence intensity and an enhanced quantum efficiency of 84.21%. This CGO: Bi3+ phosphor holds promise as a potential cyan phosphor for white light sources.

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The authors state that the analyzed and relevant data of synthesized materials, which are included and described in the manuscript, will be freely available to researchers and scientists who are working for the purpose of research and social welfare.

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Acknowledgements

Project supported by the Natural Science Foundation of Fujian Province, China (Grant No. 2021J05234), the National Natural Science Foundation of China (No. 52062008), the Natural Science Foundation of Guangxi province (2018GXNSFAA050021), the opening fund of Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices (No. 20AA-20).

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  1. Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of EducationGuangxi Key Laboratory of Optical and Electronic Materials and DevicesCollege of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People’s Republic of China

    Shan Zhang, Jiangcong Zhou, Maoli Wang & Rui Zhang

  2. College of Chemistry and Materials Science, Longyan University, Fujian, 364012, China

    Jiangcong Zhou & Dewu Wu

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  1. Shan Zhang
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All the authors contributed to the manuscript. SZ and JZ: materials preparation, conceptualization, methodology, investigation, formal analysis, data curation, visualization, writing, review. MW and DW: materials preparation, data collection, and formal analysis; RZ: review and supervision.

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Correspondence to Jiangcong Zhou.

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Zhang, S., Zhou, J., Wang, M. et al. Regulation of the luminescence of Bi3+-activated Ca5Ga6O14 phosphors by varying doping concentration and composition design. Appl. Phys. A 129, 847 (2023). https://doi.org/10.1007/s00339-023-07123-w

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