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Luminescent Properties in Relation to Controllable Phase and Morphology of LuBO3:Eu3+ Nano/Microcrystals Synthesized by Hydrothermal Approach

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The calcite and vaterite type LuBO3:Eu3+ nano/microcrystals with various morphologies were
synthesized by the hydrothermal (HT) approach through controlling the pH values of the precursor
solutions. The calcite type LuBO3:Eu3+ shows the dominant magnetic dipole 5D0-7F1 emission due to S6
inversion symmetry of Lu. It also shows a symmetrical O-Eu charge transfer (CT) excitation band,
which, however, is asymmetrical and broad in the material prepared by the solid-state (SS) reaction
method. The effect of the residual OH- groups introduced in HT synthesis is discussed on O-Lu exciton
annihilation and local environment distortion. Two different Eu3+ centers, one of which is with inversion
symmetry, are observed in vaterite type LuBO3:Eu3+. The HT sample with nanostructures, such as vaterite
type flowerlike LuBO3:Eu3+, demonstrates a red shift of the CT band and appearance of a long excitation
tail at the long wavelength side of the CT band. XRD, selective excitation and fluorescence decay
measurements indicate that the red shift is induced by an increase of crystal lattice parameters, and the
excitation tail is responsible to the Eu3+ ions located at lower symmetric sites. These sites are attributed
to the positions at or close to the surface of the nanostructures in the sample. As the lower symmetric
sites are selectively excited, the red emission of 5D0-7F2 of Eu3+ enhanced twice relatively to the orange
emission of 5D0-7F1, exhibiting superior color chromaticity in red for display application. The luminescence
properties of interior Eu3+ and outside Eu3+ are studied and discussed in detail.

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Informasi Detail

Judul Seri

Chemistry of Materials

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2009

Deskripsi Fisik

Chem. Mater. 2009, 21, 468–475

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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