Luminescence studies on Al4B2O9:Eu2+ phosphor crystals |
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| Authors: | Yingli Zheng Donghua Chen |
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| Institution: | Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Material Science, South–Central University for Nationalities, Wuhan 430074, Hubei, People's Republic of China |
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| Abstract: | A novel blue‐emitting phosphor, Eu2+‐doping Al4B2O9, was prepared via a modified solid‐state reaction. Al4B2O9:Eu2+ nanoparticles with diameters varying in a range from 20 to 50 nm were obtained using urea as an auxiliary reagent at the optimum temperature of 850°C. The crystallization and particle sizes of Al4B2O9:Eu2+ were investigated using powder X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Photoluminescence (PL) results showed that Al4B2O9:Eu2+ phosphor could be efficiently excited by the ultraviolet region from 240 to 410 nm, exhibiting bright blue emission. Further investigation on concentration‐dependent emission spectra indicated that the Al3.997B2O9:Eu2+0.003 phosphor exhibited the strongest luminescent, and the relative PL intensity decreased with increasing Eu2+ concentration due to concentration quenching. In addition, the concentration quenching for the one‐Eu‐site emission centers was caused by the electric multipole–multipole interaction. Copyright © 2010 John Wiley & Sons, Ltd. |
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| Keywords: | aluminum borate X‐ray diffraction blue‐emitting phosphor nanoparticles luminescence |
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