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Title: Band-Gap modulation in single Bi3+-doped Yttrium-Scandium-Niobium vanadates for color tuning over the whole visible spectrum
Authors: Kang, F
Zhang, H
Wondraczek, L
Yang, X
Zhang, Y
Lei, DY 
Peng, M
Issue Date: 2016
Publisher: American Chemical Society
Source: Chemistry of materials, 2016, v. 28, no. 8, p. 2692-2703 How to cite?
Journal: Chemistry of materials 
Abstract: The use of rare-earth (RE) (e.g., Eu2+/Ce3+) ions as single luminescent centers in phosphors with tailorable emission properties has been extensively studied for their potential use in white LEDs. However, significant limitations remain, in particular, for red-emitting phosphors due to the inherently broad excitation bands which result from the underlying d-f transitions and span large parts of the visible spectral region. Guided by density functional theory calculations on the ligand structure of the non-RE Bi3+ ion, we report here on an alternative class of phosphors, [(Y,Sc)(Nb,V)O4:Bi3+], which exhibit homogeneous Bi3+ luminescence. In these materials, adjustment of the cation fractions enables dedicated tailoring of the excitation scheme within the spectral range of ∼340-420 nm and, in the meanwhile, allows for tunable emission spanning from about 450 nm (blue) to 647 nm (orange-red). The practical absence of any overlap between the emission and excitation spectra addresses the issues of emission color purity and visible reabsorption. Tailoring through band-gap modulation is achieved by single or parallel substitution of Nb by V and Y by Sc. Such topochemical design of the ligand configuration enables modulation of the electronic band gap and thus provides a new path toward tunable phosphors, exemplarily based on Bi3+ single doping.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.6b00277
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