title: Self-organized growth of Si/Silica/Er2Si2O7 core-shell nanowire heterostructures and their luminescence.
abstract: Self-organized Si-Er heterostructure nanowires showed promising 1.54 microm Er(3+) optical activity. Si nanowires of about 120-nm diameter were grown vertically on Si substrates by the vapor-liquid-solid mechanism in an Si-Er-Cl-H(2) system using an Au catalyst. Meanwhile, a single-crystalline Er(2)Si(2)O(7) shell sandwiched between nanometer-thin amorphous silica shells was self-organized on the surface of Si nanowires. The nanometer-thin heterostructure shells make it possible to observe a carrier-mediated 1.53 microm Er(3+) photoluminescence spectrum consisting of a series of very sharp peaks. The Er(3+) spectrum and intensity showed absolutely no change as the temperature was increased from 25 to 300 K. The luminescence lifetime at room temperature was found to be 70 micros. The self-organized Si nanowires show great potential as the material basis for developing an Si-based Er light source.
authors.affiliation: School of Advanced Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea. hjc@yonsei.ac.kr
authors.forename: Heon-Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Jung H
authors.initials: JH
authors.lastname: Shin
authors.forename: Kiseok
authors.initials: K
authors.lastname: Suh
authors.forename: Han-Kyu
authors.initials: HK
authors.lastname: Seong
authors.forename: Hee-Chul
authors.initials: HC
authors.lastname: Han
authors.forename: Jung-Chul
authors.initials: JC
authors.lastname: Lee
mesh_terms: D003460:Crystallization / Q000379:methods*; D004559:Electric Wiring; D004871:Erbium / Q000737:chemistry*; D049449:Luminescence; D046911:Macromolecular Substances / Q000737:chemistry / Q000528:radiation effects; D008422:Materials Testing; D008968:Molecular Conformation; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D012822:Silicon Dioxide; D004871:Erbium; D012825:Silicon