ZnO micro particles in the range 0.4-0.6 μm were synthesized by microwave irradiation
method. The XRD analysis reveals that the sample is in the wurtzite phase with orientation
along the (101) plane. SAED pattern of the sample reveals the single crystalline nature of
the micro grains. TEM images show the formation of cylindrical shaped ZnO micro
structures with hexagonal faces. The optical phonon modes were slightly shifted in the
Raman spectrum,attributed to the presence of various crystalline defects and laser induced
local heating at the grain boundaries. A broad transmission profile was observed in the
FTIR spectrum from 1550-3400 cm-1 which falls in the atmospheric transparency window
region. PL spectrum centered at 500 nm with a broad band in the region 420-570 nm
comprised of different emission peaks attributed to transition between defect levels.
Various emission levels in the sample were expliained with a band diagram
Description:
Journal of Optoelectronics and Biomedical Materials Vol. 4, Issue 1, January-March 2012, p. 1 - 7