Fluorescence latent fingerprinting (LFP) imaging is a convenient and frequently used in situ detection technique. In recent years, various types of phosphors have been widely used for LFP imaging. However, traditional phosphor powders are suffering from a formidable challenge to design effective fluorescent LFP powders with low background interference and high detection sensitivity. In this work, we have synthesized Zn2GeO4:Mn,Li,K (ZGO:Mn,Li,K) nanophosphors with the high persistent luminescence (PersL) brightness and long duration using hydrothermal method by optimizing synthesis conditions. The ZGO:Mn,Li,K phosphors, with a perceptible green PersL, have been successfully used for developing LFPs on non-fluorescent substrate, fluorescent substrate, and PersL substrate without special equipment. Besides the level 1 and level 2 details, the other details of LFPs even exceeding level 3 details including the ridge width and boundary streamline of LFPs and the sweat pore feature are distinguishable. These findings show that the ZGO:Mn,Li,K phosphors, with multimode luminescence and high detection sensitivity, will promise a more sophisticated luminescent label for LFP detection on various substrates.

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2008) Theoretical study of the dependence of EPR spectra on local structure for octahedral Cr 3+ centres in oxides and fluorides series, Molecular Physics, 106:8, 999-1006,A theoretical method for investigating the inter-relation between the EPR parameters and local structure has been established on the basis of the complete energy matrices for 3d 3 configuration ions in both the trigonal and tetragonal ligand fields. By means of this method, the local structure of the octahedral Cr 3þ centres in double molybdates series and spinels series as well as the perovskite-type fluorides series has been studied systematically. Furthermore, the dependence of the EPR zero-field splitting parameter D on the local structure parameters in both trigonal and tetragonal ligand-fields has been revealed, simultaneously. The inter-relation between the EPR parameters D and Ág(g // À g ? ) is also elucidated.

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