Eu2+-doped aluminum nitride (AlN) phosphors were prepared by a carbothermal reduction process in ambient N2 atmosphere. Their structures and luminescence properties were studied in terms of the reaction temperature, soaking time, Eu2+ concentration, and carbon content. Pure AlN:Eu2+ phosphors could be obtained with a reaction temperature of 1750°C and a soaking time of 8 h. The dominant emission wavelength of the phosphor could be tuned widely from blue to green by changing the carbon content, which was attributed to the decrease of oxygen content with the increase of carbon content. An obvious enhancement in luminescence intensity was observed by the addition of Li+ to the host of AlN:Eu2+ phosphors, which was due to the promotion of crystallinity, the increase of grain size, and the decrease of lattice distortion.
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Document Type: Research Article
Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Publication date: 2010-06-01