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Effect of synthesis method on the structural and optical properties of blue-excitable La2−xPrx(MoO4)3 phosphors

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Abstract

Structural, optical and photoluminescent properties of La2−xPrx(MoO4)3 phosphors with different doping concentrations of Pr3+, synthesized by conventional solid-state and solution combustion routes were studied. X-ray diffraction studies of compounds synthesized through conventional solid-state ceramic route confirm that all samples crystallized in monoclinic La2(MoO4)3 structure with c2/c space group, while combustion synthesized compounds show the existence of two different crystal environments. Analysis of UV–visible diffuse reflectance spectra (DRS) shows characteristics of absorption bands in blue and red regions for Pr3+ substituted La2(MoO4)3 samples, synthesized by both methods. The calculated band gap from the DR spectrum showed an inverse dependence with Pr3+ doping concentration for solid-state synthesized La2−xPrx(MoO4)3 samples, while for combustion synthesized La2−xPrx(MoO4)3 compounds the variation of band gap with concentration is not monotonous. The photoluminescence emission spectrum of blue excited La2−xPrx(MoO4)3 phosphors synthesized by both routes showed similar multicoloured emission bands. Maximum emission intensity was observed for Pr3+ concentration of x = 0.05 in both synthesis methods. The exchange interaction between nearest activator ions leads to concentration quenching of luminescence for solid-state synthesized La2−xPrx(MoO4)3 compounds and dipole–dipole interaction for combustion synthesized La2−xPrx(MoO4)3 compounds. The average emission colour of the blue excited La2−xPrx(MoO4)3 phosphors lies in the yellow–orange region. The CCT values lie in the warm light region and the luminescence lifetime of 8 µs for red emission peak showed promising applications requiring fast switching response.

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Acknowledgements

The authors would acknowledge Mar Ivanios College; Nalanchira, Thiruvananthapuram IISER; Trivandrum, STIC; Cusat and CLIFF; University of Kerala, Karivattom for providing analysis facilities.

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Authors and Affiliations

  1. Department of Physics, Research Centre-University of Kerala, Mar Ivanios College, Bethany Hills, Nalanchira, Thiruvananthapuram, Kerala, 695015, India

    R. Satheesh, S. P. Anusree & V. S. Dhanya

  2. Department of Physics, V.T.M.N.S.S College, Dhanuvachapuram, Thiruvananthapuram, Kerala, 695503, India

    R. Satheesh

  3. Department of Physics, Mahatma Gandhi College, Kesavadasapuram, Pattom, Thiruvananthapuram, Kerala, 695004, India

    H. Padma Kumar

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Satheesh R: methodology, formal analysis, investigation, software, writing original draft. Anusree S. P: formal analysis, investigation; Dhanya V. S: formal analysis, investigation; H. Padma Kumar: conceptualization, validation, resources, supervision.

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Correspondence to H. Padma Kumar.

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Satheesh, R., Anusree, S.P., Dhanya, V.S. et al. Effect of synthesis method on the structural and optical properties of blue-excitable La2−xPrx(MoO4)3 phosphors. Appl. Phys. A 130, 270 (2024). https://doi.org/10.1007/s00339-024-07449-z

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