NDLI: Chemical bond properties and charge transfer bands of $O^{2−}–Eu^{3+},$ $O^{2−}–Mo^{6+}$ and $O^{2−}–W^{6+}$ in $Eu^{3+}-doped$ garnet hosts $Ln_{3}M_{5}O_{12}$ and $ABO

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Choi, Byung Chun Moon, Byung Kee Noh, Hyeon Mi Liu, Xiaoguang Li, Ling Jeong, Jung Hyun
Description	Author Affiliation: Liu X ( Ministry-of-Education Key Laboratory for the Synthesis and Applications of Organic Functional Molecules, Hubei Collaborative Innovation Center for Advanced Organochemical Materials, Hubei University, Wuhan 430062, China.)
Abstract	Charge transfer (CT) energy from the ligand to the central ions is an important factor in luminescence properties for rare earth doped inorganic phosphors. The dielectric theory of complex crystals was used to calculate chemical bond properties. Combining the photoluminescence and the dielectric theory of complex crystals, the CT bands of $O^{2−}–Eu^{3+},$ $O^{2−}–Mo^{6+}$ and $O^{2−}–W^{6+}$ for $Eu^{3+}-doped$ inorganic phosphors have been investigated experimentally and theoretically. Taking $Eu^{3+}-doped$ $Ln_{3}M_{5}O_{12}$ (Ln = Y, Lu and M = Al, Ga), $Gd_{3}Ga_{5}O_{12},$ $MMoO_{4}$ (M = Ca, Sr, Ba) and $MWO_{4}$ (M = Ca, Sr, Ba) as typical phosphors, we investigated the effects of the cation size on the CT bands and chemical bond properties including the bond length (d), the covalency $(f_{c}),$ the bond polarizability $(α_{b})$ and the environmental factor $(h_{e})$ of $O^{2−}–Eu^{3+},$ $O^{2−}–Mo^{6+}$ and $O^{2−}–W^{6+},$ respectively. For systematic isostructural $Ln_{3}M_{5}O_{12}$ (Ln = Y, Lu and M = Al, Ga) phosphors, with the increasing M ion radius, the bond length of Ln–O decreases, but $f_{c}$ and $α_{b}$ increase, which is the main reason that the environmental factor increased. For the isostructural $MMoO_{4}:Eu,$ with the increasing M ion radius, the Mo–O bond length increases, but $f_{c}$ and $α_{b}$ decrease, and thus $h_{e}$ decreases. However, in the compound system $MWO_{4}:Eu$ (M = Ca, Ba) with the increasing M ion radius, the O–W bond length increases, but $f_{c}$ and $α_{b}$ increase, and thus $h_{e}$ increases and the O–W CT energy decreases. Their $O^{2−}–Eu^{3+},$ $O^{2−}–Mo^{6+}$ and $O^{2−}–W^{6+}$ CT bands as well as their full width at half maximum (FWHM) were directly influenced by $h_{e}.$ And with the increasing $h_{e},$ CT bands of O–Eu or O–Mo or O–W decrease and their FWHM increases. These results indicate a promising approach for changing the material properties, searching for new $Eu^{3+}$ doped molybdate, tungstate or other oxide phosphors and analyzing the experimental result.
ISSN	14779226
Issue Number	23
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-06-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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