The configuration of Cu centers in electroluminescent SrS:Cu phosphors: an x-ray absorption fine structure and optical study

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The configuration of Cu centers in electroluminescent SrS:Cu phosphors: an x-ray absorption fine structure and optical study
Autor D. Wruck, R. Boyn, Marion Wienecke, F. Henneberger, U. Troppenz, B. Hüttl, W. Bohne, B. Reinhold, H.-E. Mahnke
In: Journal of Applied Physics
Ausgabe 91
ISBN/ISSN:
Erscheinungsjahr 2002
Jahrgang
Seitenzahl 2847-2852
Hyperlink http://scitation.aip.org/content/aip/journal/jap/91/5/10.1063/1.1433933
Review anderes

X-rayabsorption fine structure and photoluminescence measurements are combined to analyze the structure of Cu centers in SrS:Cu thin-film and powder samples. We find that all the data can be understood on the basis of a model involving three kinds of Cu centers: (i) dumbbell-type Cu–Cu complexes (which are the dominant centers), (ii) substitutional centers (CuSr), and (iii) interstitial centers (Cui). The bond lengths in the dumbbell centers are determined from the x-rayabsorption data. Two characteristic emission bands peaking at about 460 and 510 nm are attributed to Cui and dumbbell centers, respectively. The dependences of the emission spectrum on temperature and Cu concentration are explained by a dissociation–association reaction of the type Cu–Cu↔CuSr+Cui, assuming center-dependent excitation efficiencies and thermal quenching rates.