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We have studied the photoluminescence properties of in mullite. The 0.005 mol -activated mullite shows a single broad-band emission character and an emission band at about 435 nm. The emission band shifts slightly to a longer wavelength with an increase in concentration because the distance between ions decreases and the probability of energy transfer among ions increases with increased concentration. However, mullite shows two emission centers, an - and an -site, which peak at 420 and 482 nm. Also, we investigated the compositional dependence of the luminescence properties of the ions based on the different Al/Si ratios.
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Park et al. (2003) studied this question.
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