Open AccessTunable and stable UV-NIR photoluminescence from annealed SiO_x with Si nanoparticles
Author(s) -
Keng-hui Lin,
SzChian Liou,
WeiLiang Chen,
ChengLung Wu,
Gong−Ru Lin,
Y. H. Chang
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.023416
Subject(s) - photoluminescence , materials science , ultraviolet , infrared , nanosecond , nanoparticle , optoelectronics , wavelength , transmission electron microscopy , optics , visible spectrum , laser , nanotechnology , physics
We demonstrate stable and tunable light emission in ultraviolet to near infrared regime by using annealed SiOx sample. By adjusting the ratio of Si and O of SiOx, different wavelengths such as ultraviolet, visible and near infrared photoluminescence can be tuned. From the results of transmission electron microscope, various sizes (1~4 nm) of the embedded Si nanoparticles were formed. Nanoparticles with smaller sizes were indeed formed for UV-blue emitting samples and the origin of light emission may be misattributed to the quantum confinement effects. However, we found the efficient and stable light emission in UV-blue regime, with lifetime on the order of nanoseconds, is dominantly from the defects.