Enhanced UVB emission and analysis of chemical states of Ca5(PO4)3OH:Gd3+,Pr3+ phosphor prepared by co-precipitation |
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| Institution: | 1. Department of Physics, University of the Free State, Bloemfontein ZA9300, South Africa;2. School of Physics, Shri Mata Vaishno Devi University, Katra 182320, Jammu and Kashmir, India;3. Centre for HRTEM, Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth ZA6031, South Africa;1. Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia;2. Taiyuan University of Technology, 030024 Taiyuan, China;3. Luminescent Materials Laboratory, Department of Biotechnology, University of Verona, and INSTM, UdR Verona, Strada Le Grazie 15, I-37134 Verona, Italy;1. School of Materials and Energy, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou 510006, People''s Republic of China;2. Experimental Teaching Department, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou 510006, People''s Republic of China;3. Basic Teaching Department, Guangzhou Maritime University, Hongshan Three Road, No. 101, Guangzhou 510725, People''s Republic of China;4. School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou 510006, People''s Republic of China;1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, PR China;2. College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian, 350117, PR China;3. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, PR China |
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| Abstract: | Hydroxyapatite (Ca5(PO4)3OH) is a well-known bioceramic material used in medical applications because of its ability to form direct chemical bonds with living tissues. This mineral is currently used as a host for rare-earth ions (e.g. Gd3+, Pr3+, Tb3+, etc.) to prepare phosphors that can be used in light emitting devices of different types. In this study Ca5(PO4)3OH:Gd3+,Pr3+ phosphors were prepared by the co-precipitation method and were characterised by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive x-ray spectroscopy and photoluminescence spectroscopy. The x-ray diffraction pattern was consistent with the hexagonal phase of Ca5(PO4)3OH referenced in JCPDS card number 73-0293. The x-ray photoelectron spectroscopy data indicated that Ca2+ occupied two different lattice sites, referred to as Ca1 and Ca2. The photoluminescence data exhibited a narrowband emission located at 313 nm, which is associated with the 6P7/2→8S7/2 transition of the Gd3+ ion. This emission is classified as ultraviolet B and it is suitable for use in phototherapy lamps to treat various skin diseases. The photoluminescence intensity of the 313 nm emission was enhanced considerably by Pr3+ co-doping. |
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| Keywords: | A Inorganic compounds A optical materials C photoelectron spectroscopy D crystal structure D luminescence |
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