SUPPLEMENTAL MATERIAL FOR:
Oxide Phosphors for Light Upconversion; Yb3+ and Tm3+ Co-Doped
Y2BaZnO5
12
3
2
2
Isabelle Etchart , Ignacio Hernández , Arnaud Huignard , Mathieu Bérard , Marine
Laroche2, William. P. Gillin3, Richard. J. Curry4 and Anthony K. Cheetham1,a)
1
Materials Science and Metallurgy Department, University of Cambridge, Pembroke Street CB2 3QZ,
UK
2
Saint-Gobain Recherche, 39 quai Lucien Lefranc, 93303 Aubervilliers, France
3
Department of Physics, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
4
a)
Advanced Technology Institute, University of Surrey, Guildford, Surrey GU2 7XH, UK
Author to whom correspondence should be addressed. Electronic mail: akc30@cam.ac.uk.
1
(a)
974 nm exc
Intensity /a.u.
Intensity /a.u.
200
100
1
1200
1250
Wavelength /nm
0
1000
1100
1200
1300
1400
Wavelength /nm
(b)
Intensity /a.u.
463 nm exc
10
900
1000
1100
1200
1300
Wavelength /nm
FIG.
S1.
Typical
down-conversion
luminescence
spectra
of
Y2BaZnO5:
Yb3+(6%),Tm3+(0.25%) phosphors at room temperature under (a) 974 nm excitation, and (b)
463 nm excitation.
2
Normalized intensity
1.0
463 nm exc
790 nm exc
0.5
0.0
900
1000
1100
Wavelength (nm)
FIG. S2. Typical luminescence spectrum of Y2BaZnO5:Yb3+(6%),Tm3+(0.25%) phosphors at
room temperature under 463 nm and 790 nm excitations.
2.0
% Tm
3+
1.5
1.0
0.5
0.0
2
4
6
8
% Yb
10
12
14
3+
FIG. S3. Yb3+ and Tm3+ concentrations of the Y2BaZnO5:Yb3+,Tm3+ samples for which
upconversion efficiencies were measured (see FIG. 4).
3
Normalized intensity
1
796 nm
0.1
654 nm
0.01
479 nm
0.000
0.001
0.002
0.003
Time (s)
FIG. S4. Typical temporal evolution of the blue (479 nm), red (654 nm) and near-infrared
(796 nm) emissions under pulsed 974 nm excitation and data fitting in order to get average
lifetimes in Y2BaZnO5:Yb3+(6%),Tm3+(0.25%) at room temperature. Note that the small
peak observed at around t ~ - 45 s is due to some pick up of the radiofrequency from
the flash lamp firing.
4
excitation
974 nm
974 nm
974 nm
974 nm
463 nm
463 nm
463 nm
emission
479 nm
654 nm
796 nm
1022 nm
479 nm
654 nm
796 nm
0% Yb,
0.25% Tm
2% Yb,
0.25% Tm
6% Yb,
0.25% Tm
10% Yb,
0.25% Tm
10% Yb,
0.5% Tm
10% Yb,
1% Tm
10% Yb,
2% Tm
N.A.
N.A.
N.A.
N.A.
194 s
193 s
434 s
290 s
279 s
659 s
488 s
191 s
191 s
420 s
176 s
181 s
435 s
303 s
182 s
181 s
352 s
141 s
145 s
319 s
256 s
178 s
175 s
342 s
134 s
135 s
304 s
251 s
157 s
154 s
279 s
71 s
75 s
203 s
199 s
129 s
126 s
222 s
60 s
73 s
180 s
164 s
101 s
102 s
189 s
TABLE SI. Concentration dependence of lifetimes corresponding to the 479 nm, 654 nm, 796
nm and 1022 nm emissions under pulsed 974 nm and 463 nm excitations of
Y2BaZnO5:Yb3+(x%),Tm3+(y%) (x = 0,2,6,10 and y = 0.25,0.5,1,2). Errors in the reported
values are typically of the order 5%.
Intensity (a.u.)
0.1
479 nm
454 nm
0.01
1E-3
1E-4
0.000
0.001
0.002
Time (s)
FIG. S5. Typical temporal evolution of the 454 nm and 479 nm blue emissions under pulsed
974 nm excitation in Y2BaZnO5:Yb3+(6%),Tm3+(0.25%) at room temperature.
5