Wide-Band Excited Y6(WMo)0.5O12:Eu Red Phosphor for White Light Emitting Diode: Structure Evolution, Photoluminescence Properties, and Energy Transfer Mechanisms Invol

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• 作者：Huaiyong Li ; Hyeon Mi Noh ; Byung Kee Moon ; Byung Chun Choi ; Jung Hyun Jeong ; Kiwan Jang ; Ho Sueb Lee ; Soung Soo Yi
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：October 7, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：11210-11217
• 全文大小：590K
• 年卷期：v.52,no.19(October 7, 2013)
• ISSN：1520-510X

文摘

Y₆(WMo)_0.5O₁₂ activated with Eu³⁺ ions was investigated as a red-emitting conversion phosphor for white light emitting diodes (WLEDs). The phosphors were synthesized by calcining a citrate-complexation precursor at different temperatures. The photoluminescence properties of the phosphors and the energy transfer mechanisms involved were studied as a function of structure evolution. It was found that the host lattices were crystallized in a cubic or a hexagonal phase depending on the synthesis conditions. Although all the phosphors showed intensive red emission under an excitation of near-UV or blue light due to energy transfer from the host lattices to Eu³⁺ ions, the photoluminescence spectra and temporal decay features were found to vary significantly with the structure and crystallinity of the host lattice. The mechanisms of the energy transfer from the host lattices to Eu³⁺ ions and energy quenching among Eu³⁺ ions were discussed on the basis of structure evolution of the host lattice. Phosphors calcined at 800 and 1300 掳C were suggested to be promising candidates for blue and near-UV light excited WLEDs, respectively.