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Issue 14, 2013
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Reduction of Mn4+ to Mn2+ in CaAl12O19 by co-doping charge compensators to obtain tunable photoluminescence

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Abstract

Green and red photoluminescence (PL) is obtained from manganese activated phosphor CaAl12O19 (CAO) synthesized using a solid-state reaction method. The red PL is attributed to Mn4+ at an octahedral Al3+ site and the green PL is from Mn2+ at a tetrahedral Al3+ site. Thermal reduction of Mn4+ to Mn2+ in CAO lattice does not complete, even in a reducing atmosphere, but can be fully realized through co-doping of trivalent ions such as Bi3+ and La3+ with ion radii similar to that of Ca2+. The intensity of the Mn2+ green luminescence strongly depends on the co-doping concentration of the trivalent ions.

Graphical abstract: Reduction of Mn4+ to Mn2+ in CaAl12O19 by co-doping charge compensators to obtain tunable photoluminescence

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Supplementary files

Article information


Submitted
19 Nov 2012
Accepted
30 Jan 2013
First published
31 Jan 2013

RSC Adv., 2013,3, 4510-4513
Article type
Communication

Reduction of Mn4+ to Mn2+ in CaAl12O19 by co-doping charge compensators to obtain tunable photoluminescence

J. Lu, Y. Pan, J. Wang, X. Chen, S. Huang and G. Liu, RSC Adv., 2013, 3, 4510
DOI: 10.1039/C3RA22938F

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