Abstract
In the present work, luminescent Sr 2 CeO 4 :Eu 3+ (5 mol %), Zn 2+ (0.25–3 mol %) nanophosphors were fabricated by the ultrasound irradiated sonochemical method. The samples prepared with 3 h ultrasound treatment exhibit well crystalline and single phase Sr 2 CeO 4 . The dumbbell shaped morphology of the prepared samples was elucidated from both SEM and TEM results. The energy band gap of the prepared samples was estimated and found to be in the range ∼3.18–3.63 eV. The incorporation of Zn 2+ greatly influences the defect and emission intensities, as revealed from photoluminescence and positron lifetime spectroscopy measurements. The enhancement in the photoluminescence emission intensity after Zn 2+ incorporation was observed, which may be due to the creation of defects and efficient energy transfer between Zn 2+ and Eu 3+ or defects that can act as emission centers. The positron lifetime spectroscopy qualitatively explains the concentration of defects (vacancy and voids) which are induced by Zn 2+ co-doping. The encryption strategies are provided using the photoluminescent chalk for high level information protection. We believe that the versatile, convenient and user-friendly strategy demonstrated herein will open a new insight for on-site information protection.
| Original language | English |
|---|---|
| Pages (from-to) | 159-171 |
| Number of pages | 13 |
| Journal | Optical Materials |
| Volume | 90 |
| DOIs | |
| Publication status | Published - 1 Apr 2019 |
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Influence of Zn 2+ doping on the lattice defects and photoluminescence studies of Sr 2 CeO 4 :Eu 3+ nanophosphor : Applications for data encryption strategies. / Sudheendra, H. S.; Darshan, G. P.; Basavaraj, R. B.; Naik, Yashwanth V.; Premakumar, H. B.; Nagabhushana, H.; Williams, J. F.; Hareesh, K.; Kokila, M. K.
In: Optical Materials, Vol. 90, 01.04.2019, p. 159-171.Research output: Contribution to journal › Article
TY - JOUR
T1 - Influence of Zn 2+ doping on the lattice defects and photoluminescence studies of Sr 2 CeO 4 :Eu 3+ nanophosphor
T2 - Applications for data encryption strategies
AU - Sudheendra, H. S.
AU - Darshan, G. P.
AU - Basavaraj, R. B.
AU - Naik, Yashwanth V.
AU - Premakumar, H. B.
AU - Nagabhushana, H.
AU - Williams, J. F.
AU - Hareesh, K.
AU - Kokila, M. K.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - In the present work, luminescent Sr 2 CeO 4 :Eu 3+ (5 mol %), Zn 2+ (0.25–3 mol %) nanophosphors were fabricated by the ultrasound irradiated sonochemical method. The samples prepared with 3 h ultrasound treatment exhibit well crystalline and single phase Sr 2 CeO 4 . The dumbbell shaped morphology of the prepared samples was elucidated from both SEM and TEM results. The energy band gap of the prepared samples was estimated and found to be in the range ∼3.18–3.63 eV. The incorporation of Zn 2+ greatly influences the defect and emission intensities, as revealed from photoluminescence and positron lifetime spectroscopy measurements. The enhancement in the photoluminescence emission intensity after Zn 2+ incorporation was observed, which may be due to the creation of defects and efficient energy transfer between Zn 2+ and Eu 3+ or defects that can act as emission centers. The positron lifetime spectroscopy qualitatively explains the concentration of defects (vacancy and voids) which are induced by Zn 2+ co-doping. The encryption strategies are provided using the photoluminescent chalk for high level information protection. We believe that the versatile, convenient and user-friendly strategy demonstrated herein will open a new insight for on-site information protection.
AB - In the present work, luminescent Sr 2 CeO 4 :Eu 3+ (5 mol %), Zn 2+ (0.25–3 mol %) nanophosphors were fabricated by the ultrasound irradiated sonochemical method. The samples prepared with 3 h ultrasound treatment exhibit well crystalline and single phase Sr 2 CeO 4 . The dumbbell shaped morphology of the prepared samples was elucidated from both SEM and TEM results. The energy band gap of the prepared samples was estimated and found to be in the range ∼3.18–3.63 eV. The incorporation of Zn 2+ greatly influences the defect and emission intensities, as revealed from photoluminescence and positron lifetime spectroscopy measurements. The enhancement in the photoluminescence emission intensity after Zn 2+ incorporation was observed, which may be due to the creation of defects and efficient energy transfer between Zn 2+ and Eu 3+ or defects that can act as emission centers. The positron lifetime spectroscopy qualitatively explains the concentration of defects (vacancy and voids) which are induced by Zn 2+ co-doping. The encryption strategies are provided using the photoluminescent chalk for high level information protection. We believe that the versatile, convenient and user-friendly strategy demonstrated herein will open a new insight for on-site information protection.
KW - Doppler broadening spectroscopy
KW - Luminescent chalk
KW - Photoluminescence
KW - Positron annihilation spectroscopy
KW - Ultrasonication route
UR - http://www.scopus.com/inward/record.url?scp=85062440893&partnerID=8YFLogxK
U2 - 10.1016/j.optmat.2019.02.026
DO - 10.1016/j.optmat.2019.02.026
M3 - Article
VL - 90
SP - 159
EP - 171
JO - Optical Materials
JF - Optical Materials
SN - 0925-3467
ER -