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Cited by 382

The DOI matches its Crossref record; 25 of the 25 references it cites were found in a registry or an index.

Consequences of Optimal Bond Valence on Structural Rigidity and Improved Luminescence Properties in SrxBa2–xSiO4:Eu2+ Orthosilicate Phosphors

Denault, Kristin A., Brgoch, Jakoah, Gaultois, Michael W., Mikhailovsky, Alexander, Petry, Ralf, Winkler, Holger, DenBaars, Steven P., Seshadri, Ram·2014·Chemistry of Materials
DOI 10.1021/cm500116u
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Abstract

The orthosilicate phosphors Sr x Ba 2– x SiO 4:Eu 2+ have now been known for over four decades and have found extensive recent use in solid-state white lighting. It is well-recognized in the literature and in practice that intermediate compositions in the solid-solutions between the orthosilicates Sr 2 SiO 4 and Ba 2 SiO 4 yield the best phosphor hosts when the thermal stability of luminescence is considered. We employ a combination of synchrotron X-ray diffraction, total scattering measurements, density functional theory calculations, and low-temperature heat capacity measurements, in conjunction with detailed temperature- and time-resolved studies of luminescence properties to understand the origins of the improved luminescence properties. We observe that in the intermediate compositions, the two cation sites in the crystal structure are optimally bonded as determined from bond valence sum calculations. Optimal bonding results in a more rigid lattice, as established by the intermediate compositions possessing the highest Debye temperature, which are determined experimentally from low-temperature heat capacity measurements. Greater rigidity in turn results in the highest luminescence efficiency for intermediate compositions at elevated temperatures.

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Metadata

Authors
Denault, K. A., Brgoch, J., Gaultois, M. W., Mikhailovsky, A., Petry, R., Winkler, H., DenBaars, S. P., & Seshadri, R.
Venue
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Published
2014-03-19
Volume
26
Issue
7
Pages
2275-2282
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
DOI
10.1021/cm500116u
OpenAlex
W2315233296
Cited by
382
References
25
FWCI
15.78
Type
journal article
Language
en
Open access
closed

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