Supplementary material
Observation of multiple sites for trivalent Europium Ions in SrAl
2O
4Jakob Bierwagena, Teresa Delgadoa,b, Jafar Afshania, Songhak Yoonc, Nando Gartmannd, Bernhard Walfortd and Hans Hagemanna*
Table S1. Fractional coordinates of atoms and voids in SrAl2O4
Figure S1. Room temperature luminescence spectra of SrAl2O4:Eu excited at 463 nm (in red) and 362 nm (in blue), showing the presence of both Eu2+ and Eu3+.
Figure S2. 12 K Emission spectrum of SrAl2O4:Eu3+ excited at 266 nm
Figure S3. The excitation spectrum of SrAl2O4:Eu was measured at 8 K with a resolution of 12 cm-1. The transition 7F0-5D0 shows three peaks. The detection window was set on the 5D0-7F2
band around 610 nm.
Figure S4. Room temperature emission spectra of SrAl2O4:Eu excited at nominally 574.5, 576 and 583.5 nm
Figure S5. 3 K emission spectra of SrAl2O4:Eu excited with different wavelength around 460 nm.
Figure S6. Comparison of 5D0 – 7FJ (top) and 5D1 – 7FJ (bottom) emissions at room temperature. The top spectrum was excited at 392 nm in the Fluorolog instrument, while the bottom trace was excited with a laser at 488 nm.
Table S1. Fractional coordinates of atoms and voids in SrAl2O4.
Lattice parameters: a = 844.7 pm, b = 881.6 pm, c = 516.3 pm, β = 93.42
Atom x y z
Sr1 0.490
5 0.000 0.250
7 Sr2 0.029
2
0.992 9
0.202 0 Al1 0.189
5
0.831 4
0.715 8 Al2 0.799
7
0.839 4
0.728 7 Al3 0.708
7
0.668 5
0.223 6 Al4 0.680
9
0.170 7
0.797 5 O1 0.265
0
0.174 0
0.436 0 O2 0.736
0
0.316 0
0.589 0 O3 0.327
0
0.493 0
0.345 0 O4 0.265
0
0.984 0
0.898 0 O5 0.174
0
0.297 0
0.936 0 O6 0.206
0
0.669 0
0.906 0 O7 0.487
0
0.219 0
0.876 0 O8 0.990
0
0.888 0
0.651 0 V1 -0.019 0.163
0
0.682 0 V2 0.506
0
0.315 0
0.313 0
Figure S1. Room temperature luminescence spectra of SrAl2O4:Eu excited at 463 nm (in red) and 362 nm (in blue), showing the presence of both Eu2+ and Eu3+.
Figure S2. 12 K Emission spectrum of SrAl2O4:Eu3+ excited at 266 nm
Figure S3. The excitation spectrum of SrAl2O4:Eu was measured at 8 K with a resolution of 12 cm-1. The transition 7F0-5D0 shows three peaks. The detection window was set on the 5D0-7F2
band around 610 nm.
Figure S4. Room temperature emission spectra of SrAl2O4:Eu excited at nominally 574.5, 576 and 583.5 nm
Figure S5. 3 K emission spectra of SrAl2O4:Eu excited with different wavelength around 460 nm.
Figure S6. Comparison of 5D0 – 7FJ (top) and 5D1 – 7FJ (bottom) emissions at room temperature. The top spectrum was excited at 392 nm in the Fluorolog instrument, while the bottom trace was excited with a laser at 488 nm.
400 300 200 100 0
x103
18.0 17.5
17.0 16.5
16.0
x103
16920 17109
16779
17316
5D0 --> 7F0
5D0 --> 7F1
5D0 --> 7F2 V2 EMPA DTA
100 80 60 40 20 0
x103
20.0 19.5
19.0 18.5
18.0
x103
