Novel promising blue MSiAl 2 O 3 N 2:Ce 3+ (M = Sr, Ba) and green BaSiAl 2 O 3 N 2:Eu 2+ oxynitride phosphors with broad band emission for white light-emitting diodes are obtained in this study. The detailed energy transfer mechanism from Ce 3+ to Eu 2+ in SrSiAl 2 O 3 N 2 is reported. Moreover, the unexpected red shift emission when the compositional variable x is increased from 0 to 0.92 in the Sr 0.92- x Ba x SiAl 2 O 3 N 2:Ce 3+ 0.04,Eu 2+ 0.04 system is well investigated. The decrease in emission energy and the increase in thermal quenching barrier height of x are caused by a dominant chemical pressure compression effect on the activator sites, through which the replacement of Sr 2+ (occupied by activators) by larger Ba 2+ enhances the covalency of Sr–N/O bonding in spite of unit cell enlargement. The chemical pressure compression effect control for photoluminescence is verified by the ionic-radii equilibrium between 9-coordinate IX Sr 2+ and ( IX Ca 2+, IX Ba 2+ ).
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Huang et al. (2014) studied this question.
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