Effective visualization of latent fingerprints with red fluorescent La2(MoO4)3:Eu3+ microcrystals

Li, Feng; Liu, Shiqi; Qi, Ruiyan; Li, Hongren; Cui, Tianfang

doi:10.1016/j.jallcom.2017.08.182

Cited by 26 publications

(5 citation statements)

References 28 publications

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“…The excitation spectrum of Eu 3+ doped NPs may categorize into three regions, namely (i) charge transfer (CT) band, (ii) peak to peak absorption, and (iii) f−f transitions. The position of CT band was estimated according to Jorgensen formula 42 as given:…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The excitation spectrum of Eu 3+ doped NPs may categorize into three regions, namely (i) charge transfer (CT) band, (ii) peak to peak absorption, and (iii) f–f transitions. The position of CT band was estimated according to Jorgensen formula as given: where σ is energy of CT band, and χ opt (X) and χ cuncorr (M) are electronegativities of the ligand anion and central metal ion, respectively. The calculated position of CT from Eu 3+ –O 2– band is 42 600 cm –1 ; hence, no obvious CTB was noticed in the mentioned region.…”

Section: Resultsmentioning

confidence: 99%

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Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Deepthi

Darshan²,

Basavaraj

et al. 2018

ACS Sustainable Chem. Eng.

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SnO 2 :Eu 3+ nanopowders were prepared by biofriendly hydrothermal method using Aloe Vera gel as a biotemplate. Prepared samples were characterized for their structural, morphological, and optical properties using powder X-ray diffraction, scanning/transmission electron microscopies, and diffused reflectance spectroscopy. Morphology shows the layered structures with sharp edges confirms the system with better surface area along with sticky nature. Energy band gap of the samples varies from 3.44 to 3.74 eV. Photoluminescence results showed the dipolar−dipolar interactions and led to red light emission when excited with 392 nm excitation wavelength. Optimized compounds were explored for their feasibility to visualize well-preserved latent fingerprints on the various types of surfaces. Visualized fingerprints show the details of third-level ridges, bifurcations, and pores with high selectivity, better contrast, and without background hindrance. Clarity of developed fingerprints was also examined under aquatic environment and abrasion test. Even severe environmental conditions demonstrated successfully the robustness and supremacy of the present approach. It is anticipated that the present nanostructures could be used in the visualization of LFTs and its utility for various forensic and optoelectronic applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Deepthi

Darshan²,

Basavaraj

et al. 2018

ACS Sustainable Chem. Eng.

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“…Identification of any third parties at a crime scene can be through DNA or fingermarks, for example. Here electron microscopy can aid research and development into novel techniques for improvements in sensitivity or detection rates [26,27]. In addition to trace evidence assessment, this chapter examines microscopy techniques and their part in research and development in the field of forensic science, with a particular emphasis on developments in fingerprint investigations.…”

Section: Forensic Science Under Siegementioning

confidence: 99%

Microscopy in Forensic Sciences

Jones

2019

Springer Handbooks

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This chapter examines the use of electron microscopy, atomic force microscopy and other analytical techniques in forensic investigation and research. These tools can be used to enhance examination of human remains and trace evidence to improve understanding of cause of death, victim identification or post mortem interval.A police-designed scenario is used to highlight trace evidence such as glass, gun shot residue and paint. The validity of forensic techniques is discussed, with reference to international standards, repeatability, and false convictions. Ballistic evidence is used to highlight the complexities in evidence interpretation, including manufacturing variability, environmental effects and likelihood ratios.The use of SEM, AFM and other techniques in the development of forensic research is showcased, with particular examples from the field of fingerprints. Examples include improvements in the development of fingermarks from difficult surfaces, interaction of evidence types, and added intelligence from the crime scene, such as forensic timeline or gender of perpetrator.

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“…Recently, rare earth (RE)-ion-doped dimolybdate (ALn(MoO 4 ) 2 : A = alkali elements and Ln = trivalent RE elements) red phosphors have been attracting increasing attention because of their great physicochemical stability, attractive electromagnetic properties, and excellent luminescence properties. [11,12] Among the dimolybdate materials, the LiLa(MoO 4 ) 2 complexes crystallize in the scheelite structure (I4 1 /a space group), where the Mo 6+ ions are coordinated with four oxygen atoms to construct a tetrahedral arrangement. The A sites are occupied by 50% Li + and 50% La 3+ ions in a stochastic distribution, resulting in a low-symmetry environment; the Li + and La 3+ cations are coordinated by eight oxygen atoms of various MoO 4 tetrahedra that share common vertices to form an octahedron.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photoluminescence enhancement of the LiLa(MoO₄)₂:Sm³⁺ red phosphors by co‐doping with Bi³⁺

et al. 2022

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The LiLa(MoO 4 ) 2 :Sm 3+ and LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ phosphors were prepared using the citric-acid-fueled combustion method and the influence of concentrations of Bi 3+ dopant on LiLa(MoO 4 ) 2 :Sm 3+ red luminescence was investigated. The LiLa(MoO 4 ) 2 : Sm 3+ and LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ samples matched well with the scheelite structure and I4 1 /a space group and did not detect structural changes. Under an excitation of 403 nm, the prepared LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ phosphor was excited and produced orange-red emission. When compared with the LiLa(MoO 4 ) 2 :Sm 3+ phosphor, the LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ phosphor exhibited enhanced fluorescence intensity because the Bi 3+ dopant ions are doped as a sensitizer. The optimal doping concentrations of Sm 3+ and Bi 3+ were 5 and 1 mol%, respectively. Furthermore, the energy transfer from Bi 3+ to Sm 3+ is effective ( 3 P 1 ! 4 K 11/2 ). Subsequently, the electrons in an unstable excited state were transferred to a stable ground state ( 4 G 5/2 ! 6 H 5/2 , 6 H 7/2 , 6 H 9/2 ). The Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of the optimized LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ phosphor were situated in the orange-red region. The luminescence of the LiLa(MoO 4 ) 2 :Sm 3+ ,Bi 3+ phosphor generated under near-ultraviolet (UV) irradiation could be used to produce a warm white light, indicating its possible applications in white light-emitting diodes.

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Effective visualization of latent fingerprints with red fluorescent La2(MoO4)3:Eu3+ microcrystals

Cited by 26 publications

References 28 publications

Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Microscopy in Forensic Sciences

Synthesis and photoluminescence enhancement of the LiLa(MoO₄)₂:Sm³⁺ red phosphors by co‐doping with Bi³⁺

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Effective visualization of latent fingerprints with red fluorescent La2(MoO4)3:Eu3+ microcrystals

Cited by 26 publications

References 28 publications

Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Nanostructured Stannic Oxides for White Light Emitting Diodes Provides Authentication for Latent Fingerprints Visualization under Diverse Environmental Conditions

Microscopy in Forensic Sciences

Synthesis and photoluminescence enhancement of the LiLa(MoO4)2:Sm3+ red phosphors by co‐doping with Bi3+

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Synthesis and photoluminescence enhancement of the LiLa(MoO₄)₂:Sm³⁺ red phosphors by co‐doping with Bi³⁺