Strong and stable blue photoluminescence: The peapodlike SiOx

Peapodlike heterostructure composed of SiO_x particles orderly embedded in the high-crystalline α -Al₂ O₃ nanoribbons was fabricated via a two-step thermal reaction route. The room temperature photoluminescence spectrum of the products showed a strong and stable blue emission centered at 467 nm under excitation at 320 nm, which was attributed to the especial heterostructure. This technique also provided a general and convenient approach for preparing even more complex heterostructures and would be useful in improving the properties of materials. © 2009 American Institute of Physics.