Abstract
In order to enhance the deep red emission intensities of CaAl12O19:Cr3+ and CaAl12O19:Mn4+ phosphors, the authors prepared a series of samples through doping a variety of ions with different valence states at 1500 °C by solid state reaction in air. Their doping effects and possible mechanisms were investigated, respectively. The results indicated that Sm3+ could enhance the emission intensity of CaAl12O19:Cr3+ through an energy transfer process, whereas it has not a similar effect for the CaAl12O19:Mn4+ phosphor. It is also shown that Cl−, Mg2+ and K+ could enhance the emission intensity of CaAl12O19:Mn4+ mainly due to their charge compensation effects. What is more interesting is that the doped Ge4+ ion, as a type of covalent ion of Mn4+, also has the ability to enhance the red emission intensity of CaAl12O19:Mn4+ through decreasing the concentration of Mn4+–Mn4+ pairs in the prepared phosphor.
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This work was supported by the National Natural Science Foundation of China (No. 51302059) and Natural Science Foundation of Anhui Province (1708085ME121).
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Xu, Y., Zhang, Y., Wang, L. et al. Red emission enhancement for CaAl12O19:Cr3+ and CaAl12O19:Mn4+ phosphors. J Mater Sci: Mater Electron 28, 12032–12038 (2017). https://doi.org/10.1007/s10854-017-7014-3
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DOI: https://doi.org/10.1007/s10854-017-7014-3