The Wayback Machine - https://web.archive.org/web/20070112151337/http://www.ece.uncc.edu:80/~ebstokes/research.htm
Light emitting diodes (LED) & optoelectronic device research
at UNC
Charlotte
We are developing fabrication, test & reliability methods
for ultraviolet, green, and white III-nitride LED?s. Also, we are investigating
the optical properties of III-nitride materials in order to drive better device
performance and create new classes of optically pumped devices. Finally, we are
developing new classes of materials for fabrication of better LED?s. LED?s have
applications in general illumination, display technology, and spectroscopy.
Projects:
LED Fabrication and Reliability
Infrared acceptor
ionization
Stokes research group,
Spring 2004, UNCC ECE department:
L-R: Jennifer Pagan (PhD candidate),
Anthony
Alexander (Undergraduate),
Professor Ed Stokes
,
Alec Martin (Master?s candidate, Hasan group),
Paolo
Batoni (PhD candidate), Tiffany Morton (Undergraduate), Casey Burkhart
(Undergraduate),
Aaron
?
Bridgers (Undergraduate), Trevor Peters
(Undergraduate), Missing: Mike Ahrens (Master?s candidate)
Background:
Stegosaurus made by artist Jim Gary from old car parts,
see
http://www.belkcollege.uncc.edu/news/dinosaurs.htm
Stokes research group,
Summer 2003, UNCC ECE department:
L-R: Jennifer Pagan (Graduate),
Bernard
Vaughn (Undergraduate, Strategies for Success), Paolo Batoni (Senior
Undergraduate),
Mike
Ahrens (Graduate),
Professor Ed Stokes
, Mikhail
Turovskiy (Graduate)
Blue light:
An InGaN LED, fabricated from
commercial material in the UNCC CARC clean room.
Infrared photocurrent
spectroscopy of III-nitride LED?s and materials:
Paolo and
Jennifer are acquiring infrared photocurrent data on III-nitride materials
and
devices from GE Research Lab. The ultimate goal of this work is to create
infrared
pumped
LED devices with enhanced performance for spectroscopic applications.
The
tunable infrared source is a YAG pumped LaserVision OPO.
Efficiency and reliability
testing of commercial LED?s:
Undergraduate
researcher Bernard Vaughn is using an integrating sphere spectrometer
apparatus
to measure the efficiency and reliability of various commercial white LED?s.
Contact deposition:
Mike Turovskiy and Mike Ahrens
are
depositing ohmic contracts onto blue InGaN LED?s