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Spectroscopic investigations of Sm3+ doped Ca0.5La(MoO4)2 phosphor for solid state lighting applications

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Abstract

The Sm3+- doped Ca0.5La(MoO4)2 were successfully synthesized by the solid state reaction method. Indexed powder X-Ray diffraction pattern suggests the scheelite tetragonal crystal structure. Surface Morphology of the sample shows polyhedral morphology and the average particle size estimated from SEM image is 5.5 µm. The energy dispersive X-ray analysis confirms the existence of Ca, La, Mo, O, and Sm elements. The room temperature photoluminescence (PL) emission spectra of Sm3+- doped Ca0.5La(MoO4)2 with various concentrations upon 404 nm excitation were recorded. The PL emission spectra show three intense emission peaks at 565, 600 and 647 nm were owing to the f–f electronic transitions of 4f electrons of Sm3+ attributed to the transitions 4G5/2→6H5/2, 4G5/2→6H7/2 and 4G5/2→6H9/2 respectively. Among them, bright orange-red visible emission is obtained due to 4G5/2→6H9/2 transition. The decay time and color chromaticity co-ordinates were estimated. From the obtained results, the prepared powder phosphor Ca0.5La(MoO4)2:Sm3+ stands as a suitable candidate for the display and solid state lighting applications.

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Acknowledgments

The authors are grateful to the Science and Engineering Research Board–SERB, New Delhi for funding this work under the SERB Project SR/FTP/PS—135/2011.

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Authors and Affiliations

  1. Department of Physics, B.S.Abdur Rahman University, Vandalur, Chennai, Tamilnadu, 600 048, India

    V. Mahalingam, M. Syed Gulam Ambia & J. Thirumalai

  2. Department of Physics, Rajalakshmi Institute of Technology, Kuthambakkam Post, Chennai, Tamilnadu, 600 124, India

    R. Krishnan

  3. Department of Physics, Sree Sevugan Annamalai College, Devakottai, Tamilnadu, 630 303, India

    R. Chandramohan

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  1. V. Mahalingam
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Correspondence to J. Thirumalai.

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Mahalingam, V., Syed Gulam Ambia, M., Thirumalai, J. et al. Spectroscopic investigations of Sm3+ doped Ca0.5La(MoO4)2 phosphor for solid state lighting applications. J Mater Sci: Mater Electron 28, 2838–2845 (2017). https://doi.org/10.1007/s10854-016-5867-5

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