The extraction of light from current light emitting diodes (LEDs) is very low due to the large index of refraction mismatch between the semiconductor and dielectric interface resulting in a small percentage of light escaping the LED As a result of this problem a new solution is necessary for improving the photon extraction efficiency from LEDs. One solution that is explored in this paper is the use of the extraordinary optical transmission phenomenon in which the amount of light passing through a diffraction limited aperture is greater than expected. This effect is most often associated with periodically perforated metal films. This metal film also has the potential to be used as the carrier injector superstrate to reduce the effects of carrier density gradients when driving LEDs at high currents.
In this paper, the fundamental properties of the extraction efficiency problem will be defined and the current density gradient problem is experimentally verified. A theoretical background on the surface plasmon phenomenon is then explored and a subsequent analysis of the transmission characteristics of an infinitely thin perfectly conducting periodically perforated metal film is explored. It is then shown what effects thickness have on the periodically perforated metal film and how it affects the surface plasmon prorogation. Finally, an analysis of how quantum well based LEDs can further improve the performance of the efficiency by directly coupling radiative recombinations to surface plasmon modes.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 49/05M, Masters Abstracts International|
|Subjects:||Electrical engineering, Optics, Condensed matter physics|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be