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Issue 44, 2013
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Structure–composition relationships and optical properties in cerium-substituted (Sr,Ba)3(Y,La)(BO3)3 borate phosphors

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Abstract

Relationships between the structure and composition, and their influence on the optical properties, of a family of cerium-substituted borate compounds with formula A3RE(BO3)3 (A = Ba, Sr; RE = Y, La) are studied using a combination of high resolution synchrotron X-ray powder diffraction and photoluminescence. Examination of the coordination environment of the Ce3+ active site polyhedra coupled with photoluminescence at 77 K reveal three distinct excitation bands corresponding to Ce3+ located on three distinct crystallographic sites. Comparing the position of these excitation bands with crystal field splitting effects due to changes in polyhedral volumes and distortions suggest an assignment of the three excitation bands. These compounds are efficiently excited by UV light (≈340 nm) with blue emission at a maximum wavelength of 413 nm for Ba3Y(BO3)3:Ce3+,Na+, 422 nm for Sr3Y(BO3)3:Ce3+,Na+, and 440 nm for Sr3La(BO3)3:Ce3+,Na+. The most efficient compound was determined to be Sr3La(BO3)3:Ce3+,Na+ with a quantum yield of 50%.

Graphical abstract: Structure–composition relationships and optical properties in cerium-substituted (Sr,Ba)3(Y,La)(BO3)3 borate phosphors

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Publication details

The article was received on 17 Aug 2013, accepted on 24 Sep 2013 and first published on 25 Sep 2013


Article type: Paper
DOI: 10.1039/C3TC31621A
Citation: J. Mater. Chem. C, 2013,1, 7339-7345
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    Structure–composition relationships and optical properties in cerium-substituted (Sr,Ba)3(Y,La)(BO3)3 borate phosphors

    K. A. Denault, Z. Cheng, J. Brgoch, S. P. DenBaars and R. Seshadri, J. Mater. Chem. C, 2013, 1, 7339
    DOI: 10.1039/C3TC31621A

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