Chong WANG, Jing-hua WANG, Dong-dong LI, Jiang-bo SHE. Preparation of Gd3+-Doped LiYF4∶Yb3+/Ho3+ Micro-Crystal and the Application Research in Anti-Counterfeiting[J]. Spectroscopy and Spectral Analysis, 2022, 42(11): 3581
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 11, 3581 (2022)
Fig. 1. X-ray diffraction pattern of Li(Y1-x Gdx )0.79F4∶Yb3+/Ho3+
Fig. 2. SEM spectrum of the sample
(a): Gd3+ doping concentration is 0 mol%; (b): Gd3+ doping concentration is 30 mol%;(c): Gd3+ doping concentration is 50 mol%
(a): Gd3+ doping concentration is 0 mol%; (b): Gd3+ doping concentration is 30 mol%;(c): Gd3+ doping concentration is 50 mol%
Fig. 3. (a) Li(Y1-x Gdx )0.79F4∶Yb3+/Ho3+ micro-crystal fluorescence spectrum; (b) Li(Y1-x Gdx )0.79F4∶ Yb3+/Ho3+ micro-crystal luminescence under 980 nm excitation
Fig. 4. (a) 0 and 30 mol% concentration of Gd3+ ion doped LiYF4∶ Yb3+/Ho3+ micron crystal Up-conversion luminescence; (b) Li(Y1-x Gdx )0.79F4∶ Yb3+/Ho3+ micron crystal energy level transition diagram
Fig. 5. Upconversion fluorescence lifetime of LiYF4∶Yb3+/Ho3+ microparticle crystals doped with 0 mol% Gd3+ and 30 mol% Gd3+ ions
Fig. 6. (a) Different concentrations of Gd3+ ion doped LiYF4∶Yb3+/Ho3+ micro-crystal luminescence intensity graph; (b) red luminescence intensity ratio R % (R %=I 630~665 nm/I 450~770 nm) and green luminescence intensity ratio G %(G %=I 525~560 nm/I 450~770 nm)
Fig. 7. (a) Fluorescence spectrum of 980nm laser with excitation power of 0.5~1.5 W; (b) ratio of red to green luminous intensity when excitation power is 0.5~1.5 W (R/G=I 630~665 nm/I 525~560 nm)
Fig. 8. (a) Screen printing process diagram of anti-counterfeiting pattern; (b) Screen printing up-conversion light-emitting anti-counterfeiting pattern
Set citation alerts for the article
Please enter your email address
© Copyright 2018-2021 | Chinese Laser Press. All Rights Reserved 沪ICP备15018463号-20