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Greenish‐Yellow Emission from Dy 3+ ‐Doped Y 2 O 3 Nanophosphors
Author(s) -
Jayasimhadri M.,
Ratnam B. V.,
Jang Kiwan,
Lee Ho Sueb,
Chen Baojiu,
Yi SoungSoo,
Jeong JungHyun,
Moorthy L. Rama
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03426.x
Subject(s) - phosphor , luminescence , chromaticity , analytical chemistry (journal) , yttrium , materials science , crystallite , transmission electron microscopy , raman spectroscopy , dysprosium , doping , scanning electron microscope , emission spectrum , oxide , chemistry , spectral line , optics , nanotechnology , inorganic chemistry , optoelectronics , physics , chromatography , astronomy , metallurgy , composite material
Trivalent dysprosium‐doped cubic yttrium oxide (Y 2 O 3 ) nanophosphors were prepared by combustion synthesis using glycine as fuel. The resulting products were characterized by Raman and FT‐IR spectra to evaluate the vibrational features of the samples. X‐ray diffraction patterns confirmed the formation of a pure cubic phase of Y 2 O 3 . The morphology and selective area electron diffraction measurements were carried out using transmission electron microscopy (TEM) and field‐emission scanning electron microscopy. From TEM, it is observed that as‐prepared particles have average crystallite sizes of around 23 nm. The luminescent and dynamic properties of Y 2 O 3 :Dy 3+ were examined as a function of temperature and different concentrations of Dy 3+ . The luminescence study reveals that these phosphors predominantly exhibit greenish‐yellow emission due to strong 4 F 9 / 2 → 6 H 13 / 2 transition at 575 nm and a feeble 4 F 9 / 2 → 6 H 15 / 2 transition at 488 nm. These results show that the relative luminescence intensity of emission bands changes with different heating temperatures, while the greenish yellow color luminescence as well as Commission International d'Eclairage chromaticity coordinates extracted from the emission spectra were not affected significantly. The strong greenish‐yellow emission of Y 2 O 3 :Dy 3+ phosphor may be useful for applications in solid‐state white lamps for general illumination purposes.