SUPPLEMENTARY MATERIAL
Probing on green long persistent Eu2+/Dy3+ doped Sr3SiAl4O11emerging
phosphor for security applications
Bipin Kumar Gupta1,a), Arun Kumar1,2, Pawan Kumar1,3, Jaya Dwivedi1,3, G. N.
Pandey2and Garima Kedawat4
1
CSIR - National Physical Laboratory, Dr K S Krishnan Road, New Delhi 110012, India
2
Amity Institute of Applied Science, Amity University, Noida, Uttar Pradesh, 201303, India
Academy of Scientific and Innovative Research (AcSIR), CSIR – National Physical Laboratory campus,
3
New Delhi – 110012, India
4
Department of Physics, Kalindi College, University of Delhi, New Delhi, 110008, India
a)
Corresponding Authors Electronic Mail: bipinbhu@yahoo.com,
SCHEME S1.Schematic diagram of a MTI tubular furnace equipped with a microprocessor based
temperature controller for the synthesis of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ (where, x = 0.01 to 0.10mol%)
phosphors.
1
SCHEME S2.Protocol for the synthesis of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ (where, x = 0.01 to 0.10
mol%) phosphors.
2
FIG. S1.Transmittance of colloidalsolution of E3 phosphor in deionized water.
3
FIG. S2.Raman spectrumof E3 phosphor.
4
FIG. S3.FTIR spectrum of E3phosphor.
5
FIG. S4.XPS survey scan spectrum of E3phosphor.
6
FIG. S5.PL excitation spectra of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ (x = 0.01 to 0.10mol%) phosphor.
7
FIG. S6.PL emission spectra of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ (x = 0.01 to 0.10 mol%) phosphor.
8
FIG. S7. PL kinetic spectrum of E3 phosphor.
9
FIG. S8. Afterglow decay curves of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ (x = 0.01 to 0.10 mol%) phosphor
after ceasing the 340 nm UV excitation source at room temperature.
10
FIG. S9.TRPL afterglow decay curves of Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ phosphor, where (a) x = 0.01,
(b) x = 0.02, (c) x = 0.03, (d) x = 0.04, (e) x = 0.05, (f) x = 0.06, (g) x = 0.07, (h) x = 0.08, (i) x = 0.09,
(j) x = 0.10 after ceasing the 340 nm UV excitation source at room temperature.
11
FIG. S10. Photo ID card (a) under room light and (b) under UV excitation at 365 nm wavelength, it
exhibits phosphorescent lotus flower with emitting green color, which cannot be seen under room light,
as in Fig. 9a.
12
TABLE SI. The estimated unit cell parameters and cell volume for variants of
Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ phosphor in the range x = 0.01 to 0.10.
13
TABLE SII. The calculated weighting parameter, decay components and average decay time of
Sr2.90SiAl4O11:Eux2+/Dy0.10-x3+ phosphor in the range x = 0.01 to 0.10 mol%.
14