Open AccessResonant Raman scattering and “negative thermal quenching” of ZnO microflowers
Author(s) -
Qin Li,
Xitian Zhang,
Liang Yao,
E Zhang,
Hong Guo,
Zhiguo Zhang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.3119
Subject(s) - wurtzite crystal structure , materials science , raman spectroscopy , photoluminescence , exciton , raman scattering , scanning electron microscope , quenching (fluorescence) , scattering , optoelectronics , condensed matter physics , fluorescence , optics , zinc , composite material , physics , metallurgy
In this paper, ZnO microflowers were synthesized on silicon substrates by the thermal oxidation of pure Zn powder(99.99%). The X-ray diffraction spectrum (XRD) showed that ZnO microflowers have a hexagonal wurtzite structure. The field-emission scanning electron microscope (FE-SEM) image indicated that as-synthesized ZnO microflowers consisted of lots of long and straight microrods, which possessed hexagonal prism morphology. The length of microrods ranges from 30 to 50μm. The resonant Raman spectrum showed multiphonon scattering process the 5th-order longitudinal optical phonon (A1(LO)) mode in the backscattering geometry, indicating that the sample is of high quality. In the temperature-dependent photoluminescence (PL) spectra, “ negative thermal quenching” phenomenon of neutral acceptor bound exciton (A0X) was observed, and its origin was discussed.