Citation: NI Long, WANG Meng, ZHU Zhong-Xu, LI Ming, YUAN Chuan-Jun, WU Jian. Background-Free Development of Latent Fingerprints Using SrAl₂O₄: Eu,Dy,La Afterglow Luminescence Materials[J]. Chinese Journal of Analytical Chemistry, ;2022, 50(1): 103-111. doi: 10.19756/j.issn.0253-3820.210563 shu

Background-Free Development of Latent Fingerprints Using SrAl₂O₄: Eu,Dy,La Afterglow Luminescence Materials

NI Long ¹ ,
WANG Meng ^1,2,, ,
ZHU Zhong-Xu ¹ ,
LI Ming ^1,2 ,
YUAN Chuan-Jun ^1,2 ,
WU Jian ^3,,

1.
College of Forensic Sciences, Criminal Investigation Police University of China, Shenyang 110035, China;
2.
Research Centre of Crime Governance in the New Era, Criminal Investigation Police University of China, Shenyang 110035, China;
3.
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Corresponding author: WANG Meng, WU Jian,
Received Date: 11 June 2021
Revised Date: 3 September 2021

Fund Project: Supported by the National Natural Science Foundation of China (Nos.21205139, 21802169), the Scientific Research Fund Project from Educational Department of Liaoning Province, China (No.LJKZ0068), Liaoning BaiQianWan Talents Program in 2020, and the Innovation Ability Enhancement Project of Postraduates from Criminal Investigation Police University of China (No.2021YCYB32).

SrAl₂O₄:Eu,Dy,La afterglow luminescence materials were prepared via a one-step combustion approach at a relatively low temperature by using aluminum nitrate, strontium nitrate and rare earth nitrate as oxidants, carbamide as reductants and fuels, and boric acid as fluxing agents. The preparation conditions including furnace temperature, amount of carbamide, amount of boric acid, and doping concentrations of La³⁺ ions were optimized. Then, the micromorphology, crystal structure, ultraviolet absorption property, and luminescence performance of as-prepared materials were characterized by scanning electron microscopy, X-ray diffraction pattern, ultraviolet-visible spectrum, and fluorescence emission spectrum, respectively. The prepared materials were polyhedral in shape with micron size, and monoclinal in phase with good crystallinity, which could emit strong luminescence at 514 nm under excitation of 252 or 334 nm ultraviolet light. After excited with 365 nm long-wavelength ultraviolet light for 30 s and then removing the excitation source, these materials could maintain strong green emission in dark field. Finally, the afterglow luminescence powders were applied for background-free development of latent fingerprints on various smooth substrates. The contrast, sensitivity and selectivity in fingerprint development were discussed in detail. After enhancing by afterglow luminescence treatment, the contrast between the developing signal and background noise were strong, all the detailed features of papillary ridges were obvious, and the adsorption between the developing powders and papillary ridges were specific, showing prominent advantages such as strong contrast, high sensitivity and good selectivity. Experimental results showed that, the method proposed here based on afterglow luminescence effect could achieve a high performance in background-free development of latent fingerprints on common substrates with smooth surface, especially on substrates with complex colors as well as strong fluorescence, exhibiting easy operability, high efficiency, and wide applicability.
- Fingerprint development,
- Afterglow,
- Luminescence,
- Contrast,
- Sensitivity,
- Selectivity
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Background-Free Development of Latent Fingerprints Using SrAl₂O₄: Eu,Dy,La Afterglow Luminescence Materials