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An investigation on luminescence properties of La2CaO4:Sm3+ red-emitting phosphor

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Abstract

Sm3+-doped La2CaO4 is successfully synthesized via high-temperature solid-state method in air. The crystal structure of samples is confirmed by the X-ray diffractometer patterns. The spectral properties of samples are investigated. The excitation spectrum of La2CaO4:Sm3+ covers the region from 250 to 550 nm due to the O2−–Sm3+ charge transfer band and the f–f transitions of Sm3+ ion. Under excitation at 409 nm, La2CaO4:Sm3+ phosphor shows red emission with chromaticity coordinates (0.5936, 0.4056). The emission spectrum of La2CaO4:Sm3+ contains four spectral bands in the range of 550–750 nm owing to the 4G5/2 → 6H5/2, 6H7/2, 6H9/2, and 6H11/2 transitions of Sm3+ ion. The optimal Sm3+ concentration in La2CaO4:Sm3+ is ~ 8 mol%. The optimal sintering temperature of La2CaO4:Sm3+ phosphor is ~ 1150 °C. The lifetime of La2CaO4:Sm3+ decreases from 744.7 to 613.9 µs with increasing Sm3+ concentration from 2 to 12 mol%. The luminous mechanism is explained by the energy level diagram of Sm3+ ion.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 51862015), Project of Educational Commission of Guangdong Province (No. 2019GCZX010), Meizhou Science & Technology Project (No. 2019B0203001), Meizhou Applied Science & Technology Special Fund Project (No. 2021B0204005), Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515110691), Special fund project of Collaborative Innovation Center for Development and Utilization of Rare Metal Resources Co-sponsored by Ministry of Education and Jiangxi Province, Jiangxi University of Science and Technology (No. JXUST-XTCX-2022-03), and Guangdong Undergraduate Teaching Quality and Teaching Reform Project in 2021.

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  1. Guangdong Engineering Technology Developing Center of High-Performance CCL, Meizhou Micro-Nano Electronic Materials R & D Platform, Meizhou Rare Earth Photofunctional Materials Engineering Technology Research Center, School of Physics and Electronic Engineering, School of Chemistry and Environment, Jiaying University, Meizhou, 514015, China

    Renping Cao, Ting Chen, Lan Li, Bang Lan, Ru Liu & Xuehua Yi

  2. College of Mathematics and Physics, Jinggangshan University, Ji’an, 343009, China

    Renping Cao, Yafang Tu & Zhiyang Luo

  3. Collaborative Innovation Center for Development and Utilization of Rare Metal Resources Co-Sponsored by Ministry of Education and Jiangxi Province, Jiangxi University of Science and Technology, Ganzhou, 341000, China

    Renping Cao

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  1. Renping Cao
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Cao, R., Tu, Y., Chen, T. et al. An investigation on luminescence properties of La2CaO4:Sm3+ red-emitting phosphor. J Opt 52, 1278–1285 (2023). https://doi.org/10.1007/s12596-022-00952-7

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