Nanocomposite Phosphor Consisting of CaI2:Eu2+ Single Nanocrystals Embedded in Crystalline SiO2

• DOI: 10.1021/acsami.7b14132
• Publication Date: 2017-11-15T17:04:35Z
• Authors: Hisayoshi Daicho; Takeshi Iwasaki; Yu Shinomiya; Akitoshi Nakano; Hiroshi Sawa; Wataru Yamada; Satoru Matsuishi; Hideo Hosono
• Keywords: Cathodoluminescence

High luminescence efficiency is obtained in halide- and chalcogenide-based phosphors, but they are impractical because of their poor chemical durability. Here we report a halide-based nanocomposite phosphor with excellent sufficient durability for practical use. Our approach was to disperse luminescent single nanocrystals CaI2:Eu2+ chemically stable, translucent crystalline SiO2 matrix. Using this approach, successfully prepared by means self-organization through simple solid-state reaction. Single 6H polytype (thr notation) diameters about 50 nm could be generated not only amorphous powder also glass plate. The formed upon solidification molten CaI2 left behind the that from under influence flux effect. resulting emitted brilliant blue an internal quantum up 98% 407 violet excitation. We used cathodoluminescence microscopy, scanning transmission electron Rietveld refinement X-ray diffraction patterns confirm nanocrystals. durable sites were embedded suitable use near-ultraviolet light-emitting diodes. concept can expected effective improvements practicality poorly materials such as halides chalcogenides.