title: Vibrational and spectroscopic analysis of white light emitting Bi2SiO5nanophosphor.
abstract: A series of Dy3+ion activated Bi2SiO5nanophosphors were synthesized by the hydrothermal and coprecipitation methods. Various structural and optical characterizations were made using X-ray diffraction, Scanning and Transmission electron microscopy, UV-Visible-Infrared absorption, Raman Spectroscopy, Photoluminescence, Time resolved luminescence techniques etc. Dy3+ion doped samples yields characteristic bright yellow and blue emissions, on resonant excitation with 349nm and 386nm. The intensity ratio of the yellow/blue peaks was found to be function of Dy ion concentration and synthesis method. We have achieved white colour emission at 1.5mol% Dy concentration, CIE coordinate (0.36, 0.4) of which fall well within gamut of white light. The time-resolved fluorescence reveals decrease in radiative lifetime values with increasing Dy3+ions concentration. A comparison between the samples synthesized by different methods, and Dy ion concentrations has been made and detail photo-physics involved is presented in the article.
authors.affiliation: Department of Physics, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India.
authors.forename: Pushpa
authors.initials: P
authors.lastname: Kumari
authors.affiliation: Department of Physics, National Institute of Technology Kurukshetra, Kurukshetra, Haryana 136119, India. Electronic address: yashjidwivedi@nitkkr.ac.in.
authors.forename: Y
authors.initials: Y
authors.lastname: Dwivedi
keywords: Lanthanide elements; Nanophosphor; Photoluminescence; Vibrational analysis