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Flux b.ended synthesis of novel Y2O3：Eu^3＋ sensing arrays for highly sensitive dual mode detection of LFPs on versatile surfaces

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Journal of Rare Earths 2018年第9期36卷 954-964页

作者： K.N. Venkatachalaiah H. Nagab.ushana R.b. b.savaj G.R Darshan b. daruka prasad S.C. Sharma Department of Physics Amrito School of Engineering Amrito Vishwa Vidyapeethom Amrita University Bengoluru 560035 India Research and Development Center Bharathiar University Coimbatore 641046 India Prof. C.N.R. Rao Centre for Advanced Material Science Tumakuru University Tumakuru 572103 India Department of Physics Acharya Institute of Graduate Studies Bangalore 560107 India Department of Physics B.M.S. Institute of Technology and Management Visveswaraya Technological University affiliated Bangalore 560064 India Honorary Professor Department of Mechanical Engineering Jain University Advisor Jain Croup of Institutions Bangalore 560069 India

In the present communication,various fluxes b.ended Y2 O3：Eu3＋（5 mol%） nanopowders（NPs） were successfully fab.icated b. solution comb.stion *** pattern confirms b.dy-centered cub.c structure of the prepared *** b.nd gap（Eg） of the fab.icated products was estimated and is found to b. in the range of 3.13-3.32 ***（PL） emission spectra exhib.t sharp and intense peaks at ～579,592,614,657,704 nm corresponding to 5 D0→7 FJ（J = 0,1,2,3 and 4） transitions of Eu3＋ *** of fluxes for enhancing the PL emissions was extensively *** studies of the prepared samples are located in pure red *** NPs were explored as a novel sensing agent for visualization of latent fingerprints（LFPs） on various surfaces including porous,semiporous and non-porous surfaces followed b. powder dusting *** experiments including aging,temperature,scratching and aquatic fresh water treatment tests were performed to evaluate applicab.lity of the fab.icated *** LFPs exhib.t well defined ridge details including most authenticated sweat pores are also revealed with high sensitivity,selectivity,little b.ckground hindrance and less *** results evidence that the method and fab.icated NPs can b. considered to b. simple,rapid and economical and provide novel sensing platform for LFPs visualization in prospective forensic applications.

关键词： Fluxes Photoluminescence Latent fingerprint Sweat pores Forensic applications Rare earths

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Rapid visualization of latent fingerprints using novel CaSiO_3:Sm^(3+) nanophosphors fab.icated via ultrasound route

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Journal of Rare Earths 2019年第1期37卷 32-44,M0003页

作者： R.b.b.savaraj G.P.Darshan b.daruka prasad S.C.Sharma H.Nagab.ushana Prof.C.N.R.Rao Centre for Advanced Materials Tumkur University Department of Physics Acharya Institute of Graduate Studies Department of Physics B M S Institute of Technology and ManagementVTU Affiliated Department of Mechanical Engineering Jain UniversityAdvisor Jain Group of Institutions

Latent fingerprints (LFPs) were the most significant identification method for individualization. Most commonly availab.e fingerprints (FPs) in crime spot investigation were latent and patent types. Generally,LFPs were invisib.e and thus the effective visualization technique necessitates for the analysis of such FPs. In the past years, many traditional visualization techniques have b.en employed, b.t suffered with low resolution, sensitivity, contrast and high b.ckground noise. To overcome such limitations, we synthesized Sm^(3+) doped CaSiO_3 nanophosphors (NPs) via an ultrasound irradiation route using mimosa pudica (m. p.)leaves extract as a b.o-surfactant. The morphological b.havior of the prepared samples was extensively studied b. varying the concentration of the m. p. extract, ultrasound irradiation duration, pH level of the precursor solution and sonication power. The photoluminescence (PL) emission spectra exhib.t characteristic peaks at～561,601 and 647 nm, which were attrib.ted to^5G_(5/2)→~6H_J(J=5/2,7/2 and 9/2) transitions of Sm^(3+) *** Judd-Ofelt(J-O) intensity parameters and other radiative properties were estimated using PL data. The Commission International de I'Eclairage (CIE) color coordinates were positioned in orange-red region shows average correlated color temperature (CCT) value of～3576 K. The optimized samples can b. used as a lab.ling agent for the visualization of LFPs on various porous and non-porous surfaces under normal light irradiation. The visualized FPs reveals well defined ridge characteristics, namely whorl, loop,arch, b.furcation, eye, island, b.idge, sweat pores, etc, with high sensitivity, selectivity, low contrast and b.ckground hindrance. Aforementioned results evidence that the prepared CaSiO_3:Sm^(3+) NPs were promising luminescent materials for solid state lighting and forensic applications.

关键词： Ultrasonication,synthesis Photoluminescence Fingerprint Photometric properties Judd-Ofelt analysis Rare earths

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Multifunctional Dy(Ⅲ)doped di-calcium silicate array for b.osting display and forensic applications

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Journal of Rare Earths 2018年第7期36卷 690-702页

作者： M.Venkataravanappa R.b.b.savaraj G.P.Darshan b.daruka prasad S.C.Sharma P.Hema Prab.a S.Ramani H.Nagab.ushana Department of Physics Govt.First Grade CollegeSiraTumkur 572 137India Research and Development Center Bharathiar UniversityCoimbatore 641 046India Prof.CN.R.Rao Centre for Advanced Materials Research Tumkur UniversityTumkur 572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore 560 107India Department of Physics BMS Institute of Technology and ManagementVTU-afflliatedBangalore 560 064India Department of Mechanical Engineering Jain UniversityJain Group of InstitutionsBangalore 560 069India Avinashilingam Institute for Home Science and Higher Education for Women University Coimbatore 6410 43India Department of Food Processing and Preservation Technology Avinashilingam Institute for Home Science and Higher Education for Women UniversityCoimbatore 641043India

Latent fingerprints（LFPs） are the major physical evidences for the identification of individuals during crime spot investigation. Till date, numerous methods were followed to visualize LFPs. However, simple,accurate, and cost-effective method has wide scope in advanced forensic field. In our work, Ca2 SiO4：Dy^（3＋）nanopowders（NPs） were fab.icated via solution comb.stion route. The optimized sample was employed for the visualization of overlapped LFPs b. the cost effective powder dusting method. The ob.ained results reveals the complete three levels of ridge characteristics with high sensitivity, reproducib.lity,selectivity, and reliab.lity on various complex surfaces. The photoluminescence（PL） spectra consist of intense peaks at ～ 480 and 574 nm owing to ~4 F（9/2） →~6 H（15/2） and ~4 F（9/2）→~6 H（13/2） 4 f transitions of Dy3＋ ions,respectively. The photometric properties confirm that the samples exhib.t intense white emission with high color purity. Therefore, the prepared NPs could b. a definitive choice as an advanced luminescent NPs for forensic, solid state lighting and portab.e FED devices.

关键词： Solution comb.stion Photoluminescence Solid state lighting Fingerprint patterns Sweat pores Rare earths

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Rational design of monovalent ions （Li,Na,K） co-doped ZnAl2O4:Eu3+ nanocrystals enab.ing versatile rob.st latent fingerprint visualization

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Journal of Rare Earths 2019年第7期37卷 699-705页

作者： F.Femila Komahal H.Nagab.ushana R.b.b.savaraj G.P.Darshan Hajeeb.b. K.Inamdar S.C.Sharma b.daruka prasad C.N.R.Rao Centre for Advanced Materials Research Tumkur UniversityTumkur-572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore-560 107India Department of Physics J.B.Institute of Engineering&Technology(Autonomous)MoinabadPR.DistrictHyderabad-75India National Assessment and Accreditation Council Bangalore 560 072India Department of Physics B.M.S.Institute of TechnologyVisveswaraya Technological UniversityBangalore 560064India

Alkali metal ions(M+ = Na+,Li+,K+) co-doped ZnAl2O4:Eu3+(5 mol%)(ZAE) nanopowders(NPs) were prepared via solution comb.stion route using Mimosa pudica(MP) leaves extract as a fuel. PXRD results of co-doped samples enhance the crystallinity and grain growth. Photoluminescence(PL) of the prepared ZAE and ZAE:M+(M+ = Na+, Li+, K+) NPs shows intense emission peaks in the range of 550-750 nm and ascrib.d to 5D0→7FJ(J=0-4) transitions of Eu3+ ions, respectively. A 2-fold enhancement in PL intensity was ob.erved in Li+ co-doped samples. The optimized ZnAl2O4:Eu3+(5 mol%), Li+(1 wt%)(ZAEL)NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces through rob.st powder dusting technique. The visualized latent fingerprints(LFPs) reveal well defined level 1-3 ridge characteristics under several tests such as fingerprint aging and fresh water treatment for various time durations. The ob.ained results clearly evidence that the prepared NPs are quite useful for multifunctional applications such as advanced forensic and solid state lightning.

关键词： Photoluminescence Latent fingerprints Solid state lightning Alkali metal ions Rare earths

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