Versatile properties of CaGd2ZnO5:Eu3+ nanophosphor: its compatibility for lighting and optical display applications

Red color-emitting CaGd 2 ZnO 5 :Eu 3+ (CGZO:Eu 3+ ) nanophosphors were synthesized by a facile sol-gel process. The structural and luminescent properties of these phosphors were investigated as a function of annealing temperature and Eu 3+ ion concentration. The orthorhombic phase was confirmed at...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2015-01, Vol.44 (4), p.179-1799
Main Authors: Seeta Rama Raju, G, Pavitra, E, Nagaraju, Goli, Yu, Jae Su
Format: Article
Language:English
Subjects:
Calcium - chemistry
Drug Stability
Europium - chemistry
Gadolinium - chemistry
Lighting
Luminescence
Microscopy, Electron, Scanning
Nanostructures - chemistry
Nanostructures - ultrastructure
Optics and Photonics
Temperature
X-Ray Diffraction
Zinc Oxide - chemistry
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Summary:Red color-emitting CaGd 2 ZnO 5 :Eu 3+ (CGZO:Eu 3+ ) nanophosphors were synthesized by a facile sol-gel process. The structural and luminescent properties of these phosphors were investigated as a function of annealing temperature and Eu 3+ ion concentration. The orthorhombic phase was confirmed at different annealing temperatures, showing an irregular morphology within the nanoscale range. Photoluminescence (PL) excitation spectra of CGZO:Eu 3+ showed host absorption band (HAB), charge transfer band (CTB), and intense f-f transitions of Eu 3+ in the violet and blue wavelength regions. The CTB intensity increased and the HAB intensity decreased with increasing annealing temperature or Eu 3+ ion concentration. The CGZO:Eu 3+ exhibited a strong absorption in the blue region as compared to the CTB and had a superior property compared to available commercial phosphors. This feature facilitates the fabrication of high color rendering index white light-emitting diodes for display systems. In PL spectra, an intense red emission was observed due to the hypersensitive 5 D 0 → 7 F 2 transition with good asymmetry ratio and chromaticity coordinates. Optimized annealing temperature and concentration of Eu 3+ ions were observed for CGZO host lattice based on the 466 nm excitation wavelength. The cathodoluminescent properties were also similar to the PL results. A CGZO:Eu 3+ nanophosphor is advantageous for obtaining natural white light with higher color rendering index when mixing with YAG:Ce 3+ yellow phosphor.
ISSN:1477-9226
1477-9234
DOI:10.1039/c4dt03181d