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Structural and spectral properties of red light emitting Eu3+ activated TiO2 nanophosphor for white LED application
Affiliation:1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi''an 710062, PR China;2. Shaanxi Key Laboratory for Phytochemistry, Chemistry & Chemistry Engineering Department, Baoji University of Arts and Sciences, Baoji 721013, PR China;1. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;2. Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, China;3. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, Guangdong 510640, China;1. Shaanxi Key Laboratory for Phytochemistry, Chemistry & Chemistry Engineering Department, Baoji University of Arts and Sciences, Baoji 721001, PR China;2. Key Laboratory of Applied Surface and Colloid Chemistry (Shaanxi Normal University), Ministry of Education, School of Chemistry & Chemical Engineering, Xi''an 710013, PR China;1. Department of Physics, Jinggangshan University, Ji’an 343009, PR China;2. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, PR China;3. State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan 410083, PR China;1. Institute of Photonics and Electronics AS CR, v.v.i., Chaberská 57, 18251 Prague 8, Czech Republic;2. Institute of Inorganic Chemistry AS CR, v.v.i., 25068 Řež, Czech Republic;3. Institute of Physics of Materials AS CR, v.v.i., Žižkova 22, 616 62 Brno, Czech Republic;1. A. Mira University of Bejaia, Road of Targa Ouzemour, Bejaia, 06000, Algeria;2. Laser Department/ Nuclear Research Centre of Algiers (CRNA), 02, Boulevard Frantz Fanon, B.P. 399, Algiers, 16000, Algeria;3. Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001, Belgrade, Serbia
Abstract:The structural and luminescent properties of Eu3+ doped TiO2 nanophosphors synthesized by low cost combustion method were investigated. The X-ray diffraction analysis revealed that crystallite size decreases with doping concentration. Lattice volume expansion occurred due to the substitution of Ti4+ ions by larger ionic radii ions Eu3+. FESEM images showed prepared phosphors to be nano size spherical shaped particles. Energy band gap of 3 mol% Eu3+ doped samples decreased to 3.15 eV due to doping effect. The Eu3+ doped TiO2 nanophosphors exhibited main red emission peak centered at 616 nm under 395 nm UV light excitation. Concentration quenching was observed at 3 mol% doping, that has been ascribed to dipole-dipole interaction. The covalent nature of Eu-O bond and environment around Eu3+ ions were discussed using Judd-Ofelt (J-O) intensity parameters. Internal quantum efficiency was calculated using excited state lifetime 5D0 state of Eu3+ ion and J-O theory. The CIE colour coordinates and colour purity were calculated using the spectral energy distribution function. Low excited state life time indicated that Eu3+ doped TiO2 can be used as red emitting phosphor for white light emitting diode applications.
Keywords:Nanophosphor  Spectral parameter  Lifetime  Internal quantum efficiency
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