Combustion synthesis and luminescent properties of red-emitting Ca_{4鈭?span style='font-style: italic'>x}Al₆WO₁₆:xEu³⁺ phosphors and photoluminescence enhancement by Bi³⁺ co-doping

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• 作者：Fei Hong ; Liqun Zhou ; Ling Li ; Qinghua Xia ; Xinru Luo
• 关键词：Combustion synthesis ; Ca4&minus ; xAl6WO16 ; xEu3+ ; Co-doping Bi3+ ; Luminescence
• 刊名：Optics Communications
• 出版年：1 April, 2014
• 年：2014
• 卷：316
• 期：Complete
• 页码：206-210
• 全文大小：1067 K

文摘

A series of Ca_4鈭?em>xAl₆WO₁₆:xEu³⁺ and Ca_{4鈭?em>x鈭?em>y}Al₆WO₁₆:xEu³⁺, yBi³⁺ red-emitting phosphors have been successfully synthesized by the combustion method and characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectra (EDS) and photoluminescence (PL). The results indicated that the samples were well crystallized with irregular lamellar-like shape and belonged to the tetragonal structure and space group P4c2. Photoluminescence spectra showed that the phosphors can be efficiently excited by near-UV light and exhibited a characteristic red luminescence corresponding to the electric dipole transition ⁵D₀鈫?sup>7F₂ at 618 nm. The emission intensity of Eu³⁺ ions in the Ca₄Al₆WO₁₆ (CAWO) host largely enhanced with the concentration increasing of activator (Eu³⁺) ion and sensitizer (Bi³⁺) ion, and the emission intensity reached the maximum at x=0.4 and y=0.02 in Ca_{4鈭?em>x鈭?em>y}Al₆WO₁₆:xEu³⁺, yBi³⁺ phosphor. Addition of Bi³⁺ ions drastically improved Eu³⁺ ions emission owing to its strong absorption of excitation energy and effectively energy transfer to Eu³⁺ emission center. It is shown that Ca_4鈭?em>xAl₆WO₁₆:xEu³⁺ phosphors are promising red-emitting candidates for near-UV LED-based solid-state-lighting (SSL).