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Science 6 February 1998:
Vol. 279. no. 5352, pp. 837 - 839
DOI: 10.1126/science.279.5352.837
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Reports

A Rare-Earth Phosphor Containing One-Dimensional Chains Identified Through Combinatorial Methods

Earl Danielson, Martin Devenney, Daniel M. Giaquinta, Josh H. Golden, * Robert C. Haushalter, Eric W. McFarland, Damodara M. Poojary, Casper M. Reaves, W. Henry Weinberg, dagger Xin Di Wu

An unusual luminescent inorganic oxide, Sr2CeO4, was identified by parallel screening techniques from within a combinatorial library of more than 25,000 members prepared by automated thin-film synthesis. A bulk sample of single-phase Sr2CeO4 was prepared, and its structure, determined from powder x-ray diffraction data, reveals one-dimensional chains of edge-sharing CeO6 octahedra, with two terminal oxygen atoms per cerium center, that are isolated from one another by Sr2+ cations. The emission maximum at 485 nanometers appears blue-white and has a quantum yield of 0.48 ± 0.02. The excited-state lifetime, electron spin resonance, magnetic susceptibility, and structural data all suggest that luminescence originates from a ligand-to-metal Ce4+ charge transfer.

Symyx Technologies, 3100 Central Expressway, Santa Clara, CA 95051, USA.
The authors all contributed equally to this work.
*   Present address: Semiconductor Equipment Group, Watkins-Johnson, 440 Kings Village Road, Scotts Valley, CA 95066-4081, USA.

dagger    To whom correspondence should be addressed. E-mail: hweinberg{at}symyx.com

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Combinatorial discovery of oxidative dehydrogenation catalysts within the Mo-V-Nb-O system.
P. Cong, A. Dehestani, R. Doolen, D. M. Giaquinta, S. Guan, V. Markov, D. Poojary, K. Self, H. Turner, and W. H. Weinberg (1999)
PNAS 96, 11077-11080
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Combinatorial Electrochemistry: A Highly Parallel, Optical Screening Method for Discovery of Better Electrocatalysts.
E. Reddington, A. Sapienza, B. Gurau, R. Viswanathan, S. Sarangapani, E. S. Smotkin, and T. E. Mallouk (1998)
Science 280, 1735-1737
   Abstract »    Full Text »


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