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Photoluminescence properties of Eu3+-activated CaMoO4 phosphors for WLEDs applications and its Judd–Ofelt analysis

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Abstract

A series of scheelite-type Eu3+-activated CaMoO4 phosphors were synthesized by the nitrate–citrate gel combustion method. All the compounds crystallized in the tetragonal structure with space group I4 1 /a (No. 88). FESEM results reveal the spherical-like morphology. The CaMoO4 phosphor exhibited broad emission centered at 500 nm under the excitation of 298 nm wavelength, while Eu3+-activated CaMoO4 shows an intense characteristic red emission peak at 615 nm at different excitation wavelengths, due to 5D0 → 7F2 transition of Eu3+ ions. The intensities of transitions between different J levels depend on the symmetry of the local environment of Eu3+ ions and were estimated using the Judd–Ofelt analysis. The high asymmetric ratio revealed that Eu3+ occupies sites with a low symmetry and without an inversion center. The CIE chromaticity co-ordinates (x, y) were calculated from emission spectra, and the values were close to the NTSC standard. Therefore, the present phosphor is highly useful for LEDs applications.

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Acknowledgements

One of the authors (R.S.) greatly acknowledges Professor Ashok K. Nagawat and Dr. K.V.R. Rao, Centre for Converging Technologies, University of Rajasthan for encouragement. Authors are thankful to DST-IRHPA for FESEM and EDX facility.

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Authors and Affiliations

  1. Centre for Converging Technologies, University of Rajasthan, Jaipur, 302 005, India

    Rohit Saraf

  2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India

    C. Shivakumara & Sukanti Behera

  3. Department of Physics, B.M.S. Institute of Technology, Bangalore, 560 064, India

    N. Dhananjaya

  4. C. N. R. Rao Center for Advanced Materials, Tumkur University, Tumkur, 572 103, India

    H. Nagabhushana

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  1. Rohit Saraf
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  2. C. Shivakumara
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  4. Sukanti Behera
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  5. H. Nagabhushana
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Correspondence to C. Shivakumara.

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Saraf, R., Shivakumara, C., Dhananjaya, N. et al. Photoluminescence properties of Eu3+-activated CaMoO4 phosphors for WLEDs applications and its Judd–Ofelt analysis. J Mater Sci 50, 287–298 (2015). https://doi.org/10.1007/s10853-014-8587-3

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