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(a) Schematic view of an octahedron. (b) Possible closed orbits in a square, circumscribed by a circle with radius .
(a) SEM image of an ensemble of SrS:Eu particles. (b) Detail of a single particle. One of the tips of the octahedron is almost perpendicular to the plane of the image. (c) Schematic view of an edge-cut octahedron.
(a) The CL spectrum of an individual and an ensemble of SrS:Eu octahedrons. (b) Difference plot between both CL spectra in (a) with indication of the mode numbers . (c) Dispersion curve for based on the resonance spectrum and for bulk material.
Selectively excited CL emission spectra (as indicated in the inset) of an octahedron with two characteristic lengths.
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