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Effect of Various Additives on Luminescence Properties of Mn2+‐Doped Ga2O3–ZnO Powders

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The (100‐x)Ga2O3xZnO–0.1MnO and 51Ga2O3–49ZnO–1M m O n –0.1MnO powders (M m O n : additives, Li2O, Na2O, K2O, MgO, CaO, ZnO, SrO, BaO, B2O3, Al2O3, Ga2O3, Y2O3, La2O3, In2O3, SiO2, TiO2, GeO2, P2O5, Nb2O5, Ta2O5, MoO3, and WO3) were prepared by a solid‐state reaction at 1000°C for 5 h in the air. In (100‐x)Ga2O3xZnO–0.1MnO powders, a green luminescence band due to the 4T1(4G)→6A1(6S) transition of Mn2+ ions appeared at 505 nm under excitation at 245 nm. It has the maximum intensity in the chemical composition (= 48.5) with the largest number of distorted and octahedrally coordinated Ga3+ ions with an oxygen vacancy (distorted GaO5 7− groups). It was found that the Mn2+ green luminescence occurred mainly because of the excitation of the distorted GaO5 7− groups and the energy transfer from distorted GaO5 7− groups to Mn2+ ions. In 51Ga2O3–49ZnO–1M m O n –0.1MnO powders, the lower the basicity of M m O n , the stronger was the integrated intensity of the Mn2+ green luminescence. It was revealed that the M m O n with lower basicity had the ability to form the distorted GaO5 7− groups. The integrated intensity of the Mn2+ green luminescence was most enhanced by the addition of B2O3 with low basicity.
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Document Type: Research Article

Publication date: 2011-12-01

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