Fabrication and characterization of CaLa2ZnO5 based nanocrystalline materials

  • Hussain, Sk. Khaja (Department of Electronics and Radio Engineering, Kyung Hee University) ;
  • Raju, G. Seeta Rama (Department of Electronics and Radio Engineering, Kyung Hee University) ;
  • Yu, Jae Su (Department of Electronics and Radio Engineering, Kyung Hee University)
  • Published : 2016.02.17

Abstract

In recent times, much effort has been concentrated on trivalent rare-earth ions activated ceramics or oxide phosphors to develop display industries due to their promising applications in optoelectronic devices and field-emission displays. To prepare efficient phosphors, citrate sol-gel method is one of the best synthetic methods. Green and blue emissive CaLa2ZnO5:RE3+ nanocrystalline materials are synthesized by a citrate sol-gel method. After the samples annealing at $1100^{\circ}C$, morphological and structural properties are investigated by scanning electron microscope images and X-ray diffraction patterns, respectively. At low electron beam voltage of <5 kV, the visible photoluminescence properties are obtained. Various concentrations of the RE3+ ions exhibited their characteristic emission peaks at different excitation wavelengths, respectively. Similarly, at high electron beam anodic voltage, the cathodoluminescence properties are studied as a function of acceleration voltage and filament current. The chromaticity coordinates are calculated for the optimized CaLa2ZnO5 nanocrystalline luminescent materials.

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