Synthesis,characterization and photoluminescence of Eu3+, Ce3+ co-doped CaLaAl3O7 phosphors |
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Authors: | Vijay Singh V.V. Ravi Kanth Kumar R.P.S. Chakradhar |
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Affiliation: | 1. Mechanical Engineering Department , Chung-Ang University , Seoul 156-756, South Korea vijayjiin2006@yahoo.com;3. Photonic Materials Laboratory, Department of Physics , Pondicherry University , Pondicherry 605 014, India;4. Glass Technology Laboratory, Central Glass and Ceramic Research Institute (CSIR) , Kolkata 700032, India |
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Abstract: | Powder phosphors of CaLa1? x Eu x Al3O7, CaLa1? x Ce x Al3O7 and CaLa0.99? x Eu x Ce0.01Al3O7, where x = 0.01, 0.03, 0.05 and 0.07, were prepared by a combustion method. The powders were well characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence techniques. Emission spectra of Eu3+-doped powder phosphors showed strong red emission at 613 nm (5D0 → 7F2); no concentration quenching was observed. Generally, Ce3+ acts as an efficient sensitizer when doped with other trivalent lanthanide ions. However, interestingly, in the CaLaAl3O7 powder phosphors, the addition of Ce3+ with Eu3+ exhibited an adverse effect–decreased photoluminescence intensity. The reasons for this behavior are discussed. |
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Keywords: | combustion XRD SEM Eu3+ Ce3+ photoluminescence CaLaAl3O7 phosphors |
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