We report the effects of synthesis pressure and sodium content in reactants on the lattice structure and photoluminescence properties of Eu‐doped CaAlSiN 3 , a red phosphor, synthesized by a low‐temperature process (up to 800°C) from ammonometallates. The lattice parameters and average and anisotropic values of crystallite size and lattice strains were calculated by refining against X‐ray diffraction data. These values are correlated with synthesis pressure and sodium content. The light emission was shown to be a result of a compromise between the effects of the lattice cell dimensions and the strains. The sample obtained at Na/Ca=2.0 under 100 MPa showed the best photoluminescence emission among all the produced samples. On the other hand, our analysis suggests the optimum pressure and Na/Ca ratio for a maximum light emission could be around 60 MPa and 2, respectively.
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Li et al. (2009) studied this question.
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