Influence of Mg on luminescence efficiency and charge compensating mechanism in phosphor CaAl12O19:Mn |
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| Authors: | YX Pan GK Liu |
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| Institution: | a Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
b Nanomaterials and Chemistry Key Laboratory, Wenzhou University, Wenzhou 325027, PR China |
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| Abstract: | Synthesized by a modified solid state method in air and mixed with MgO, the red phosphor of CaAl12O19:yMn4+ (y=0.001-1.5%) enhanced its photoluminescence efficiency by 3.5 times. The influence of MgO on crystal phases, luminescence intensity and spectral characteristics of the composition modified phosphor has been investigated by spectroscopic experiments and luminescence decay measurements. It is observed that the decay time of Mn4+ luminescence prolongs linearly with increase of MgO in the composition, indicating that the excitation energy transfer and non-radiative relaxation between Mn4+-Mn4+ pairs decrease. The presence of Mg2+ leads to a transformation of Mn4+-Mn4+ pairs connected with interstitial O2− to isolated Mn4+ ions and therefore eliminates energy transfer and provides charge compensation as well. |
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| Keywords: | Charge compensation LED phosphor Energy transfer |
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