We presents graphene-based reflective electrode on Ag films as a reflectively conductive layer for flip-chip GaN-based LEDs to improve optoelectronic characteristics of LEDs. The Ag/graphene films demonstrate thickness of about 200 nm and surface roughness. As annealing at temperature increases from 500°C to 800°C, the location of peak increases from 22.5° to 26.2° with the peak intensity becomes stronger. This may be attributed to the reduction of oxygen functional group. A graphene has first and second Raman-active modes at D band (1350 cm-1) and G band (1592 cm-1), respectively. Optimal conditions for graphene/Ag films contact of the sheet resistance is the smallest value by after heat treatment at temperatures of 800 °C. Further, graphene/Ag films were also applied to GaN-based light-emitting diodes to form an electrode with a p-type ohmic contact.
We presents a nanorods AlN films on sapphire substrate deposited at oblique-angle by a radio-frequency reactive
magnetron sputtering. A nanorods AlN layer was employed as a buffer layer for a GaN-based LEDs to improve
optoelectronic characteristics of LEDs. The diameter of the nanorods AlN buffer layer is in the range of 30-50 nm.
Typical current-voltage characteristics of the GaN-based LEDs with a nanorods AlN buffer layer have a forward-bias
voltage of 3.1 V at an injection current of 20 mA. The output intensity of LEDs initially increases linearly as the
injection current increases from 10 mA to 150 mA. The light output power of the GaN-based LED with a nanoporous
AlN layer was about 31% higher than that of a GaN-based LED without a nanoporous AlN layer at an injection current
of 250 mA.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.