Synthesis and characterization of wide band excited yellow phosphor LaNb2VO9:Dy3+ and application in potential fingerprint and lip print detection

Authors：Li, Sichun; Guo, Jiang; Shi, Wen; Hu, Xiaopeng; Chen, Shanshan; Luo, Junmeng; Li, Yuxin; Kong, Jiayun; Che, Junzhi; Wang, Haiqiang; Deng, Bin^*; Yu, Ruijin^*

Source：Journal of Luminescence, 2022, 244: 118681.

DOI：10.1016/j.jlumin.2021.118681

• Phosphors
• LaNb2VO9:Dy3+
• Latent fingerprints
• Lip print detection

LaNb2VO9:Dy3+ yellow phosphors were synthesized by high-temperature solid-state method. The luminescent properties, structure, and color purity of the products were studied systematically. LaNb2VO9:Dy3+ phosphors can be effectively excited by two broad charge transfer bands (CTB) under 307 nm excitation. The strong yellow light at 570 nm was caused by the F-4(9/2) -> H-6(13/2) energy level transition of Dy3+. The optimum doping concentration of LaNb2VO9:0.1Dy(3+) phosphor was x = 0.10 mol, and the dominant factor of concentration quenching effect is the nearest-neighbor ions interaction. The chromaticity coordinates of International Committee LaNb2VO9:Dy3+ were located in the yellow color area. In addition, LaNb2VO9:0.1Dy3+ phosphor can well visualize the latent fingerprint (LFP) image and lip print image. The levels 1-3 features of fingerprint and groove pattern of lip print can be easily recognized, with high resolution and contrast. The experimental results showed LaNb2VO9:Dy3+ can be well applied to LFP and lip print detection.

• Institution
  西北农林科技大学