Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires
ZnO, superlattice microwire, micro-photoluminescence, micro-Raman spectroscopy
Pure ZnO hexagonal microwires and Fe(Ⅲ)-doped ZnO microwires (MWs) with a novel rectangular cross section were synthesized in a confined chamber by a convenient one-step thermal evaporation method. An oriented attachment mechanism is consistent with a vapor–solid growth process. Photoluminescence (PL) and Raman spectroscopy of the Fe(Ⅲ)-doped ZnO MWs and in situ spectral mappings indicate a quasi-periodic distribution of Fe(Ⅲ) along a one-dimensional (1-D) superlattice ZnO:ZnFe2O4 wire, while PL mapping shows the presence of optical multicavities and related multimodes. The PL spectra at room temperature show weak near-edge doublets (376 nm and 383 nm) and a broad band (450–650 nm) composed of strong discrete lines, due to a 1-D photonic crystal structure. Such a 1-D coupled optical cavity material may find many applications in future photonic and spintronic devices.
Tsinghua University Press
Yun Li,Guozhang Dai,Chunjiao Zhou,Qinglin Zhang,Qiang Wan,Limin Fu,Jianping Zhang,Ruibin Liu,Chuanbao Cao,Anlian Pan,Yunhong Zhang,Bingsuo Zou, Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires. NanoRes.2010, 3: 326–338