Wang Yu, Ke Yuee, Chen Shanshan, Luo Junmeng, Shu Shuang, Gao Jing, Deng Bin, Yu Ruijin
College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
College of Chemical Biological and Environmental Engineering, Xiangnan University, Chenzhou, Hunan 423043, PR China; Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Chenzhou 423043, Hunan, PR China.
J Colloid Interface Sci. 2021 Feb 1;583:89-99. doi: 10.1016/j.jcis.2020.09.024. Epub 2020 Sep 16.
Fingerprints are widely studied due to their unique shape and lifelong properties. The latent fingerprint (LFP) visualization is critical in identifying crime scenes and personal information. At present, the powder dusting method for LFP detection is favored due to its environmental friendliness and nontoxicity. However, this method has low resolution, low sensitivity, and large background interference. To address these shortcomings, the red-emitting SrMgMoO:xEu (x = 0-0.50) phosphors were synthesized using the solid-state reaction process. The products were systematically studied through the structural phase, luminescent property, decay curve, and color purity. SrMgMoO:xEu phosphors were monitored at 596 nm and exhibited a commendable broad excitation band between 250 and 475 nm. This result indicated that the disadvantage of the poor absorption of commercial red phosphors (YOS:Eu) in the near-ultraviolet region was overcome. Under excitation at 393 nm, the synthesized SrMgMoO:Eu phosphor exhibited intense red light at 596 and 616 nm, due to the D → F and D → F transitions of Eu ions. The optimal concentration for the SrMgMoO:xEu phosphor was x = 20 mol%, and the concentration quenching effect was ascribed to the dipole-dipole interaction. The Commission International del'Eclairage (CIE) chromaticity coordinates of SrMgMoO:Eu were (0.643, 0.356), and the color purity was 99.8%. Furthermore, the fluorescent LFP images developed by SrMgMoO:0.20Eu phosphors were well visualized, and level 1-3 details were well identified with high resolution, contrast, sensitivity, and selectivity. The obtained results suggested that the SrMgMoO:Eu phosphor can be applied for LFP detection.
由于指纹独特的形状和终身不变的特性，其受到了广泛研究。潜在指纹（LFP）可视化对于识别犯罪现场和个人信息至关重要。目前，用于LFP检测的粉末撒粉法因其环境友好和无毒而受到青睐。然而，该方法分辨率低、灵敏度低且背景干扰大。为了解决这些缺点，采用固态反应法合成了发红光的SrMgMoO:xEu（x = 0 - 0.50）荧光粉。通过结构相、发光性能、衰减曲线和色纯度对产物进行了系统研究。SrMgMoO:xEu荧光粉在596 nm处被监测到，并且在250至475 nm之间表现出良好的宽激发带。这一结果表明克服了商用红色荧光粉（YOS:Eu）在近紫外区域吸收较差的缺点。在393 nm激发下，合成的SrMgMoO:Eu荧光粉由于Eu离子的D→F和D→F跃迁，在596和616 nm处呈现出强烈的红光。SrMgMoO:xEu荧光粉的最佳浓度为x = 20 mol%，浓度猝灭效应归因于偶极 - 偶极相互作用。SrMgMoO:Eu的国际照明委员会（CIE）色度坐标为（0.643, 0.356），色纯度为99.8%。此外，由SrMgMoO:0.20Eu荧光粉显影的荧光LFP图像清晰可见，并且一级至三级细节以高分辨率、对比度、灵敏度和选择性得到了很好的识别。所得结果表明SrMgMoO:Eu荧光粉可用于LFP检测。
