| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1488156 | Materials Research Bulletin | 2014 | 5 Pages |
•Intense 700–850 nm NIR emissions in MAl12O19 (M = Ca, Sr, Ba):1%Fe3+ has been obtained.•The NIR emissions can be ascribed to the octahedral Fe3+ sites.•The site symmetry of Fe3+ in CA6 and SA6 may be lower than that in BA6.•The phosphors may be potentially applied in the high-resolution bioimaging.
Intense and broad near-infrared (NIR) photoluminescence (PL) peaks locating at 777, 808 and 810 nm is observed for BaAl12O19 (BA6):1%Fe3+, CaAl12O19 (CA6):1%Fe3+ and SrAl12O19 (SA6):1%Fe3+, respectively. Electron paramagnetic resonance (EPR) spectra show that Fe3+ ions substitute for the different types of Al3+ sites simultaneously. Meanwhile, the luminescence of Fe3+ in MAl12O19 (M = Ca, Sr and Ba) are ascribed to octahedral Fe3+. In addition, the site symmetry of Fe3+ in CA6/SA6 is lower compared with BA6, deduced from the photoluminescence excitation (PLE), EPR and Fourier-transform infrared (FT-IR) spectra. These phosphors can be considered as good candidates for the applications in the field of high-resolution bioimaging.
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