Affiliation:
1. Symyx Technologies, 3100 Central Expressway, Santa Clara, CA 95051, USA.
2. The authors all contributed equally to this work.
Abstract
An unusual luminescent inorganic oxide, Sr
2
CeO
4
, 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 Sr
2
CeO
4
was prepared, and its structure, determined from powder x-ray diffraction data, reveals one-dimensional chains of edge-sharing CeO
6
octahedra, with two terminal oxygen atoms per cerium center, that are isolated from one another by Sr
2+
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 Ce
4+
charge transfer.
Publisher
American Association for the Advancement of Science (AAAS)
Reference10 articles.
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5. Step-scanned x-ray powder diffraction data for the sample were collected with the use of a 9-kW rotating anode generator equipped with a copper target and graphite monochromator. Data were collected in the 2θ range from 15° to 110° with a step size of 0.01° and a count time of 6 s per step. The powder pattern was indexed by standard methods. Space group Pbam a = 6.11897(9) Å b = 10.3495(2) Å and c = 3.5970(1) Å. The intensities were extracted using the program EXTRA [A. Altomore et al. J. Appl. Crystallogr. 28 842 (1995)] and the structure was solved ab initio using SIRPOW [
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