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Bandgap engineering—Influence of the evolution of (Zn/Mg)Al 2 O 4 :Cr 3+ spinel phosphors on the photoluminescence properties
As a luminescent center ion in materials for deep red and near‐infrared light, Cr 3+ has been extensively studied in octahedral host materials. In this study, using zinc aluminate (ZnAl 2 O 4 ) and magnesium aluminate (MgAl 2 O 4 ) spinels with abundant octahedra as substrates, a series of Zn 1− x M...
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Published in: | Journal of the American Ceramic Society 2024-06, Vol.107 (6), p.4197-4208 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | As a luminescent center ion in materials for deep red and near‐infrared light, Cr
3+
has been extensively studied in octahedral host materials. In this study, using zinc aluminate (ZnAl
2
O
4
) and magnesium aluminate (MgAl
2
O
4
) spinels with abundant octahedra as substrates, a series of Zn
1−
x
Mg
x
Al
2
O
4
:0.5%Cr
3+
(
x
= 0, 0.2, 0.4, 0.6, 0.8, and 1) fluorescent powders were first prepared via a high‐temperature solid‐state method. The influence of different Mg/Zn ratios on (Zn/Mg)Al
2
O
4
:0.5%Cr
3+
optical properties was thoroughly explored. Experimental results show that an increase in the Mg/Zn ratio reduces the crystal field strength (
D
q
) and leads to distortion of the [AlO
6
] octahedra, resulting in broadening of the photoluminescence emission spectrum. Furthermore, the addition of Mg gradually reduces the formation of inverse spinel. An appropriate Mg/Zn ratio can improve luminescent intensity and quantum efficiency. In summary, this paper, through bandgap engineering by adjusting the Mg/Zn ratio, provides a detailed account of the changes in optical properties and the underlying mechanisms during the transition from ZnAl
2
O
4
:0.5%Cr
3+
to MgAl
2
O
4
:0.5%Cr
3+
spinels. It offers valuable insights for further research on the practical applications of Cr
3+
in areas such as lighting displays and bioimaging. |
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ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.19728 |