Figure 2
Synchrotron X-ray diffraction measurements of Ba0.93Eu0.07Al2O4 phosphor. (a) Synchrotron powder XRD pattern of yellow Ba0.93Eu0.07Al2O4 phosphor using a monochromatic radiation (λ=0.413 Å). The tick marks below the pattern indicate the new orthorhombic peak positions identified by JADE software. An enlarged pattern with all peaks indexed is given in Supplementary Fig. S5. The two weak diffraction peaks indicated by * marks belong to the hexagonal BaAl2O4 (HBAO). More detailed information refers to Supplementary Fig. S5. (b) Optical image showing a Ba0.93Eu0.07Al2O4 wire being struck by a focused polychromatic synchrotron X-ray microbeam (∼0.5 µm diameter). The position of the X-ray beam is indicated by a dashed white circle. Yellow luminescence was generated locally, propagated along the wire, and emanated out at wire’s end (indicated by a white arrow head). The wire was mounted on a copper TEM grid. (c) Indexed Laue microdiffraction pattern acquired from the wire in (b) with the orthorhombic (1-11) pole near the surface normal circled. TEM, transmission electron microscope; XRD, X-ray diffraction.
