Characterization and photoluminescence properties of some CaO, SrO and CaSrO₂ phosphors co-doped with Eu³⁺ and alkali metal ions

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• 作者：B. Marí ; ^a ; ^{bmari@fis.upv.es} ; K.C. Singh^b ; Monica Moya^a ; Ishwar Singh^b ; Hari Om^b ; Subhash Chand^b
• 关键词：CaO ; Eu3+ ; M+ (Li+ ; Na+ or K+) ; SrO ; Eu3+ ; CaSrO2 ; Eu3+ ; Combustion synthesis ; Photoluminescence
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：June, 2012
• 卷：34
• 期：8
• 页码：1267-1271
• 文件大小：534 K

摘要

CaO:Eu³⁺, M⁺ (Li⁺ or Na⁺ or K⁺), SrO:Eu³⁺and CaSrO₂:Eu³⁺ powders were prepared by combustion synthesis method and the samples were further heated to 鈭?000 掳C to improve the crystallinity of the materials. The structure and morphology of materials were examined by X-ray diffraction and scanning electron microscopy. The morphology of CaO:Eu³⁺ and co-doped with alkali metal ions powders was very similar. Small and coagulated particles of nearly cubical shapes with small size distribution having smooth and regular surface were formed. The surface morphology of SrO and CaSrO₂ materials was not smooth and coagulated particles of irregular shapes with different sizes were observed. The characteristic emissions of Eu³⁺ had strong emission at 614 and 620 nm for ⁵D₀ 鈫?#xA0;⁷F₂ with other weak transitions observed at 580, 592, 654, 705 nm for ⁵D₀ 鈫?#xA0;⁷F_n transitions where n = 0, 1, 3, 4 respectively in all host lattices. Photoluminescence intensity followed the order as in CaO > CaSrO₂ > SrO lattices. A remarkable increase of photoluminescence intensity was observed by the co-doping of alkali metal ions particularly K⁺ ions in CaO:Eu³⁺.