Spherical and rod-like Gd2O3:Eu3+ nanophosphors�?�Structural and luminescent properties

Bulletin of materials science

C Shivakumara³  N Dhananjaya¹  B M Nagabhushana⁵  B Rudraswamy⁴  R P S Chakradhar²  H Nagabhushana⁶ 

[1] Department of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, India$$Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India$$Department of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, IndiaDepartment of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, India$$Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India$$Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, IndiaDepartment of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, India$$Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India$$;Glass Technology Lab, Central Glass and Ceramic Research Institute (CSIR), Kolkata 700 032, India$$Glass Technology Lab, Central Glass and Ceramic Research Institute (CSIR), Kolkata 700 032, IndiaGlass Technology Lab, Central Glass and Ceramic Research Institute (CSIR), Kolkata 700 032, India$$;Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, IndiaSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$;Department of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, India$$Department of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, IndiaDepartment of Physics, J.B. Campus, Bangalore University, Bangalore 560 056, India$$;Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India$$Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, IndiaDepartment of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India$$;Department of PG studies & Research in Physics, University College of Science, Tumkur University, Tumkur 572 103, India$$Department of PG studies & Research in Physics, University College of Science, Tumkur University, Tumkur 572 103, IndiaDepartment of PG studies & Research in Physics, University College of Science, Tumkur University, Tumkur 572 103, India$$

关键词: Red phosphor;    combustion;    hydrothermal;    photoluminescence;    optical.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A comparative study of spherical and rod-like nanocrystalline Gd₂O₃:Eu³⁺ (Gd_1.92Eu_0.08O₃) red phosphors prepared by solution combustion and hydrothermal methods have been reported. Powder X-ray diffraction (PXRD) results confirm the as-formed product in combustion method showing mixed phase of monoclinic and cubic of Gd₂O₃:Eu³⁺. Upon calcinations at 800°C for 3 h, dominant cubic phase was achieved. The as-formed precursor hydrothermal product shows hexagonal Gd(OH)₃:Eu³⁺ phase and it converts to pure cubic phase of Gd₂O₃:Eu³⁺ on calcination at 600°C for 3 h. TEM micrographs of hydrothermally prepared cubic Gd₂O₃:Eu³⁺ phase shows nanorods with a diameter of 15 nm and length varying from 50 to 150 nm, whereas combustion product shows the particles to be of irregular shape, with different sizes in the range 50â€�??250 nm. Dominant red emission (612 nm) was observed in cubic Gd₂O₃:Eu³⁺ which has been assigned to ${}^{5}D_{0} ightarrow {}^{7}F_{2}$ transition. However, in hexagonal Gd(OH)₃:Eu³⁺, emission peaks at 614 and 621 nm were observed. The strong red emission of cubic Gd₂O₃:Eu³⁺ nanophosphors by hydrothermal method are promising for high performance display materials. The variation in optical energy bandgap (𝐸_g) was noticed in as-formed and heat treated systems in both the techniques. This is due to more ordered structure in heat treated samples and reduction in structural defects.

【 授权许可】

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