Synthesis and effect of Ce and Mn co‐doping on photoluminescence characteristics of Ca6AlP5O20:Eu novel phosphors |
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Authors: | K. N. Shinde S. J. Dhoble |
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Affiliation: | 1. N.S. Science and Arts College, , Bhadrawati, Dist: Chandrapur, ‐442902 India;2. Department of Physics, RTM Nagpur University, , Nagpur, ‐440033 India |
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Abstract: | A series of Ca6AlP5O20 doped with rare earths (Eu and Ce) and co‐doped (Eu, Ce and Eu,Mn) were prepared by combustion synthesis. Under Hg‐free excitation, Ca6AlP5O20:Eu exhibited Eu2+ (486 nm) emission in the blue region of the spectrum and under near Hg excitation (245 nm), Ca6AlP5O20:Ce phosphor exhibited Ce3+ emission (357 nm) in the UV range. Photoluminescence (PL) peak intensity increased in Ca6AlP5O20:Eu,Ce and Ca6AlP5O20:Eu, Mn phosphors due to co‐activators of Ce3+ and Mn2+ ions. As a result, these ions played an important role in PL emission in the present matrix. Ca6AlP5O20:Eu, Ce and Ca6AlP5O20:Eu, Mn phosphors provided energy transfer mechanisms via Ce3+ → Eu2+ and Eu2+ → Mn2+, respectively. Eu ions acted as activators and Ce ions acted as sensitizers. Ce emission energy was well matched with Eu excitation energy in the case of Ca6AlP5O20:Eu, Ce and Eu ions acted as activators and Mn ions acted as sensitizers in Ca6AlP5O20:Eu, Mn. This study included synthesis of new and efficient phosphate phosphors. The impact of doping and co‐doping on photoluminescence properties and energy transfer mechanisms were investigated and we propose a feasible interpretation. Copyright © 2012 John Wiley & Sons, Ltd. |
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Keywords: | XRD photoluminescence SEM energy transfer phosphor |
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