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Devender Singh,Vijeta Tanwar,Anura Priyajith Samantilleke,Bernabe Mari,Shri Bhagwan,Krishan Chander Singh,Pratap Singh Kadyan,Ishwar Singh 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Eu2+ and Eu2++Ln3+ doped SrAl4O7 nanophosphors were synthesized byrapid gel combustion process. The morphology of prepared phosphorswas examined with scanning and transmission electron microscopy. The phase identification and the crystal structures of nanophosphorswere studied using X-ray powder diffraction techniques. Luminescencecharacteristics of the prepared nanophosphors were analyzed on accountof excitation, emission and phosphorescence decay analysis. Theemission spectra demonstrated the broad green emission attributed to4f65d1→ 4f7 transition of the Eu2+ ions. The effect of codoping of sometrivalent lanthanide (Dy3+, Pr3+ and Y3+) ions were investigated forimproving the emission intensity and phosphorescence decay time ofthe basic lattice of SrAl4O7:Eu2+ phosphors. The synthesized materialshad enhanced bright luminescent properties that could suitably beapplied for display as well as photovoltaic applications.
Han, Chi-Hwan,Lee, Hak-Soo,Lee, Kyung-Won,Han, Sang-Do,Singh, Ishwar Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
$TiO_2$ doped with $Er^{3+\;and\;Yb^{3+}$ was used for fabricating a scattering layer and a nano-crystalline $TiO_2$ electrode layer to be used in dye-sensitized solar cells. The material was prepared using a new sol-gel combustion hybrid method with acetylene black as fuel. The $Er^{3+}$-$Yb^{3+}$ co-doped titanium oxide powder synthesized at 700oC had embossed structure morphology with a size between 27 to 54 nm that agglomerated to produce micron size particles, as observed by the scanning electron micrographs. The XRD patterns showed that the $Er^{3+}$-$Yb^{3+}$ co-doped titanium oxide had an amorphous structure, while using the same method without doping $Er^{3+}\;or\;Yb^{3+},\;TiO_2$ was obtained in the crystallite form with thea dominance of rutile phase. Fabricating a bilayer structure consisting of nano-crystalline $TiO_2$ and the synthesized $Er^{3+}$-$Yb^{3+}$ co-doped titanium oxide showed better scattering property, with an overall increase of 15.6% in efficiency of the solar cell with respect to a single nano-crystalline $TiO_2$ layer.
한치환,Hak-Soo Lee,Kyung-won Lee,Sang-Do Han,Ishwar Singh 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
TiO2 doped with Er3+ and Yb3+ was used for fabricating a scattering layer and a nano-crystalline TiO2 electrode layer to be used in dye-sensitized solar cells. The material was prepared using a new sol-gel combustion hybrid method with acetylene black as fuel. The Er3+- Yb3+ co-doped titanium oxide powder synthesized at 700oC had embossed structure morphology with a size between 27 to 54 nm that agglomerated to produce micron size particles, as observed by the scanning electron micrographs. The XRD patterns showed that the Er3+- Yb3+ co-doped titanium oxide had an amorphous structure, while using the same method without doping Er3+ or Yb3+, TiO2 was obtained in the crystallite form with thea dominance of rutile phase. Fabricating a bilayer structure consisting of nano-crystalline TiO2 and the synthesized Er3+- Yb3+ co-doped titanium oxide showed better scattering property, with an overall increase of 15.6% in efficiency of the solar cell with respect to a single nano-crystalline TiO2 layer.