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Effects of the host lattice and doping concentration on the colour of Tb3+ cation emission in Y2O2S:Tb3+ and Gd2O2S:Tb3+ nanometer sized phosphor particles
Y 2 O 2 S and Gd 2 O 2 S phosphor lattices activated with a range of Tb 3+ concentrations have been successfully prepared as nanoparticles and their emission properties have been characterized using SEM, XRPD, photoluminescence spectroscopy and cathodoluminescence. 5 D 3 - 5 D 4 cross relaxation pro...
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| Published in: | Nanoscale 2013-09, Vol.5 (18), p.864-8646 |
|---|---|
| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Y
2
O
2
S and Gd
2
O
2
S phosphor lattices activated with a range of Tb
3+
concentrations have been successfully prepared as nanoparticles and their emission properties have been characterized using SEM, XRPD, photoluminescence spectroscopy and cathodoluminescence.
5
D
3
-
5
D
4
cross relaxation processes between Tb
3+
cations were observed in both Y
2
O
2
S and Gd
2
O
2
S as a function of Tb
3+
concentration. In the Y
2
O
2
S host lattice, the predominant emission colour shifts from blue to green with increased Tb
3+
concentration. In contrast, green emission is always predominant in Gd
2
O
2
S at Tb
3+
concentrations from 0.1 mol% to 5 mol%. This finding is explained in accordance with previous reports on the bulk materials that found the Gd
2
O
2
S lattice has a lower charge transfer state than the Y
2
O
2
S host lattice.
Photoluminescence shows the materials emit with different colours when changing the host lattice between Y
2
O
2
S and Gd
2
O
2
S. The yttrium version spans the blue to green colours whereas the gadolinium version only manifest greens. |
|---|---|
| ISSN: | 2040-3364 2040-3372 |
| DOI: | 10.1039/c3nr01034a |