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RISS 인기검색어
- 검색키워드
- 저자 : Y.Z. Halefoglu (검색결과 3 건)
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HALEFOGLU. Y.Z. 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.4
Phosphorescent materials are known as long lasting materials including lanthanide atom doped nano particles which recently have found wide application field. Phosphorescent, classically, is the materials which have light emission in visible region of electromagnetic spectrum on removal of excitation effect such as radiation, electron beam, electrical field, temperature etc. A novel red long lasting phosphor CaAl2O4 : Eu2+, Y3+ nano phosphors have been prepared using a combustion method. The crystallization, particle sizes and luminescence properties of the samples have been investigated systematically by using powder X-ray diffraction, scanning electron microscopy, luminescence spectrophotometer and FT-IR.
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Preparation of ceramic pigments by sol-gel and combustion methods
Y.Z. Halefoglu,E. Kusvuran 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.1
Ceramic pigments are extensively used in the decoration of ceramic wares. These pigments need to be stable (homogeneity,colour intensity, crystallinity) at high temperatures in a glaze. Malayaite ceramic pigments (CaSnSiO5) in this research study have been prepared in two ways: by means of a sol-gel method and a combustion method. The starting substances in the sol-gel method was TEOS, Ca(NO3)26H2O, SnCl4 and Ni(NO3)26H2O whereas in the combustion reaction the same substances with the addition of CH4N2O (urea) were used. In order to elucidate the structural evolution of these pigments with heat-treatment,infrared spectroscopy, X-ray diffraction and scanning electron microscopy were used.
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Synthesis and photoluminesence properties of NaCa4 (BO3)3:xEu2+, xCe3+ Co-doped with lanthanide
S. Isik,Y.Z. Halefoglu,O. Serindag 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9
A new borate compound NaCa4(BO3)3:xEu2+,xCe3+ co-doped with Eu2+ and, Ce3+ was prepared by combustion synthesismethod using rare-earth nitrates, urea, and boric acid as starting materials. The prepared sample was characterized throughX-ray diffraction (XRD), scanning electron microscope (SEM), and fourier transform infrared spectra (FTIR). The energydispersive x-ray spectrometer (EDX) confirmed the presence of the Na, Ca, B, O, Eu, and Ce. The photoluminescence (PL)excitation and emission spectra of the Eu2+, Ce3+co-doped NaCa4(BO3)3were also investigated using spectrometer at roomtemperature.The excitation spectrum consists of an intense band peaking at 352 nm. The emission spectrum shows a singleintensive band centered at 445 nm, which correspond to the 4f65d1 -4f7. For the excitation wavelength of 352 nm the emissionintensity increases intially with the increase of lanthanide concentration and reaches to the maximum at x = 0.05 nm.Thecritical distance of concentration quenching, the luminescence lifetime have also been investigated.
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