Effect of Polymer Cations on Photoluminescence Properties of Blue Emitting Alkaline-Earth Metals and Silicon Based Phosphors

• Autorzy: Rahman M. , Kida T. , Nagano M. , Khan M.
• Języki publikacji: EN

Abstrakty

EN

Efficient blue emitting phosphors were prepared by depositing mixed hydroxides of Ca, Sr, Ba, Mg, Eu over spherical SiO2 particles from tetra-ethyl-orthosilicate (TEOS) pre-coated with polycations (polyethyleneimine: PEI) followed by calcination at 1200C in a reducing atmosphere. The prepared phosphor showed intense blue emission, which can be ascribed to 4f 7-4f 65d interconfiguration transitions of Eu2+ ions. In contrast, the luminescence intensity of the phosphor was much decreased when prepared without polycations. It was suggested that negatively charged hydroxides are deposited on positively charged SiO2 surfaces pre-coated with polycations through electrostatic self-assembly interaction. The common formula of the prepared phosphors is AMgSi2O6:Eu2+ (A= Ca, Sr, Ba or fraction of Ca and Sr), where alkaline-earth/Si = 1, the each entire sample was prepared by treating with polycations and without polycations.

Słowa kluczowe

EN

phosphors; TEOS; polycations; electrostatic self-assembly interaction

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2007
• Tom: Vol. 81, nr 2
• Strony: 249--255
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Rahman M.

autor

Kida T.

autor

Nagano M.

autor

Khan M.

• Department of Chemical Engineering and Polymer Science, Shah Jalal University of Science and Technology, Sylhet-3114, Bangladesh

Bibliografia

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