title: Effective fingerprint recognition technique using doped yttrium aluminate nano phosphor material.
abstract: First time the yttrium aluminate nanoparticles are used to improve the fingerprint quality. Eco-friendly green combustion process is used to synthesize YAlO3:Sm(3+) (0.5-11mol%) nanophosphor using green tea leaf extract as non-toxic and eco-friendly fuel. Powder X-ray diffraction study confirms the orthorhombic phase. The average sizes of the crystallites were found to be in the range 20-35nm. The emission peaks centered at 564, 601 and 647nm is attributed to 4f-4f (4)G5/2→(6)HJ=5/2,7/2,9/2 forbidden transitions of Sm(3+) ions. Judd-Ofelt theory is applied to experimental data for providing qualitative support by determining J-O intensity parameters. The Commission International De I-Eclairage chromaticity co-ordinates are very close to National Television System Committee standard value of white emission (x=0.296, y=0.237). Further, correlated color temperature is found to be ∼11,900K. A simple, fast, highly sensitive and low-cost method for the detection and enhancement of fingermarks in a broad range of surfaces is developed and constitutes an alternative to traditional luminescent powders.
authors.affiliation: Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560 107, India; Research and Development Center, Bharathiar University, Coimbatore 641046, India.
authors.forename: G P
authors.initials: GP
authors.lastname: Darshan
authors.affiliation: Department of Physics, Dayananda Sagar Academy of Technology and Management, Bangalore 560082, India. Electronic address: premhb@gmail.com.
authors.forename: H B
authors.initials: HB
authors.lastname: Premkumar
authors.affiliation: Center for Nano Research (CNR), Tumkur University, Tumkur 572 103, India. Electronic address: bhushanvlc@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
authors.affiliation: Dayananda Sagar University, Shavige Malleshwara Hills, Bangalore 560078, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.affiliation: Department of Science, East West Institute of Technology, Bangalore 560 091, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Prashanth
authors.affiliation: Department of Physics, BMS Institute of Technology, VTU-affiliated, Bangalore 560 064, India.
authors.forename: B Daruka
authors.initials: BD
authors.lastname: Prasad
keywords: Fingerprint detection; Nanophosphor; Photoluminescence; Solution combustion