SiO 2 @LaOF:Eu 3+ core-shell functional nanomaterials for sensitive visualization of latent fingerprints and WLED applications.

Autor: Suresh C; Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India; Department of Physics, Govt. First Grade College, Tumkur 572103, India., Nagabhushana H; Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India. Electronic address: bhushanvlc@gmail.com., Basavaraj RB; Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572103, India., Darshan GP; Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India., Kavyashree D; Department of Physics, Channabasaveshwara Institute of Technology, VTU Affiliated, Gubbi 572 216, India., Daruka Prasad B; Department of Physics, BMS Institute of Technology and Management, VTU-Affiliated, Bangalore 560 064, India., Sharma SC; Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641043, India; Department of Mechanical Engineering, Jain University, Advisor, Jain Group of Institutions, Bangalore 560069, India., Vanithamani R; Department of Biomedical Instrumentation Engineering, Avinashilingam Institute for Home Science and Higher Education for Women University, Coimbatore 641043, India.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2018 May 15; Vol. 518, pp. 200-215. Date of Electronic Publication: 2018 Feb 20.
DOI: 10.1016/j.jcis.2018.01.093
Abstrakt: For the first time, intense red color composite of SiO 2 @LaOF:Eu 3+ core-shell nanostructures (NS) were fabricated via facile solvothermal method followed by thermal treatment. The obtained core-shell particles display better spherical shape and non-agglomeration with a narrow size distribution. Photoluminescence (PL) emission spectra exhibits intense peaks at ∼593 nm, 611 nm, 650 nm corresponds to 5 D 0  →  7 F J (J = 0, 1 and 2) Eu 3+ transitions respectively. The spectral intensity parameters and Eu-O ligand behaviors are estimated by means of Judd-Ofelt (J-O) theory. CIE co-ordinates are found to be (x = 0.63, y = 0.36) which is very close to standard NTSC values (x = 0.67, y = 0.33). CCT value is ∼3475 K which is less than 5000 K, as a result this phosphor is suitable for warm light emitting diodes. The optimized core-shell SiO 2 (coat III)@LaOF:Eu 3+ (5 mol%) was used as a fluorescent labeling marker for the visualization of latent fingerprints on both porous and non-porous surfaces. Obtained fingerprints are highly sensitive and selective also no background hindrance which enables level-I to level-III fingerprint ridge characteristics. Observed results indicate that the significant improvement in luminescence of coreshell NS can be explored as a sensitive functional nanopowder for advanced forensic and solid state lightning applications.
(Copyright © 2018 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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