Zhaowu WANG, Haipeng JI, Feixiang WANG, Xinghui HOU, Shasha YI, Ying ZHOU, Deliang CHEN. Valence State Control of Manganese in MgAl2O4:Mn4+ Phosphor by Varying the Al2O3 Crystal Form [J]. Journal of Inorganic Materials, 2021, 36(5): 513

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- Journal of Inorganic Materials
- Vol. 36, Issue 5, 513 (2021)

1. XRD patterns of the raw and heat-treated (at 1400 ℃ for 5 h) nano-γ -Al2O3 (the standard patterns for γ -Al2O3 and α -Al2O3 are also given) (a), XRD patterns of MgAl2O4:Mn phosphors synthesized using alumina sources with different α /(α +γ ) ratios (b), and photoluminescence emission spectra of the MgAl2O4:Mn synthesized using alumina sources with different α /(α +γ ) ratios (λ ex=365 nm) and the excitation spectra monitored for 520 and 651 nm emission of MgAl2O4:Mn with α /(α +γ )=50% (c)

2. Digital images (λ ex=365 nm) of the MgAl2O4:Mn phosphors synthesized using the alumina sources with different α /(α +γ ) ratios

3. UV-Vis-NIR diffuse reflectance spectra of the MgAl2O4:Mn synthesized using alumina sources with different α /(α +γ ) ratios

4. SEM images of the MgAl2O4:Mn synthesized using alumina sources with different α /(α +γ ) ratios

5. Photoluminescence emission spectra (λ ex=365 nm) of the MgAl2O4:Mn phosphors using the Al2O3 with different α /(α +γ ) ratios annealed at 1000 ℃ for 10 h (a), annealed at 1000 ℃ for 10 h and at 1200 ℃ for another 10 h (b), I 651 nm/I 520 nm ratios calculated from the luminescence spectra of the MgAl2O4:Mn phosphors (both as-prepared and post-annealed) (c)

6. XRD pattern (a) and photoluminescence spectrum (λ ex=365 nm) (b) of the phosphor synthesized at 1550 ℃ for 5 h using Al2O3 (AR, γ -phase, micro size) as the alumina source
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Table 1. Methods to regulate the valence state of manganese ion in the MgAl2O4:Mn phosphor

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