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Non-stoichiometric defect controlled reduction toward mixed-valence Mn-doped hexaaluminates and their optical applications

Abstract

The control of photoluminescence of manganese ions (Mn2+ or Mn4+) is not only fundamental but also a practical issue for the discovery of advanced optical materials. However, the correlation between the valence preference of Mn and structural/composition variation remains challenging. Here, we report the Mn-doped non-stoichiometric Ba0.75Al11O17.25 (BAL) compound in which unconventional spontaneous reduction of Mn4+ to Mn2+ is observed. Photoluminescence tuning of Mn2+/Mn4+ in Mn doped Ba0.75Al11O17.25-BaMgAl10O17 (BAL-BAM) solid solutions are demonstrated, and their valence state controlling mechanism is proposed based on the defect structure and composition variation. The narrow-band phosphor BAL:Mn acting as green light component is applied to fabricate the LED device with a wide color gamut of 107.3 % National Television Standards Committee (NTSC) standard. Furthermore, the fluorescence intensity ratio of Mn4+ to Mn2+ in BAM:Mn displays a good temperature sensing capability and repeatability with a maximum relative temperature sensitivity Sr of 1.63 %K-1 at 453.15 K (180 0C). This work provides a new insight into Mn valence state controlling and their photoluminescence tuning for advanced optical applications.

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Publication details

The article was received on 22 Feb 2019, accepted on 04 Apr 2019 and first published on 05 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC01026B
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Non-stoichiometric defect controlled reduction toward mixed-valence Mn-doped hexaaluminates and their optical applications

    J. Q. Hu, E. Song, Y. Y. Zhou, S. Zhang, S. Ye, Z. Xia and Q. Zhang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC01026B

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