Analysis of Light Extraction Efficiency Enhancement for Deep Ultraviolet and Visible Light-Emitting Diodes with III-Nitride Micro-Domes

III-nitride (In, Al, Ga-N) semiconductors are considered as wide-bandgap materials that have promising applications in the next generation of lighting technology such as ultraviolet (UV) / visible light-emitting diodes and laser diodes. The limitation occurred in light extraction efficiency of III-nitride LEDs is attributed to the large refractive index difference between III-nitride semiconductor and free space, which leads to significant total internal reflection at the semiconductor and air interface. This thesis presents the design of III-nitride micro-dome surface structures at the emission surface of LEDs to enhance the extraction efficiency. The extraction efficiency analysis and micro-dome structure designs were conducted for both deep-UV AlGaN quantum wells (QWs) LEDs and thin-film flip-chip (TFFC) InGaN QWs visible LEDs by using three dimensional finite difference time domain (3D-FDTD) method. The analysis results shows significant enhancement of light extraction efficiency from both deep-UV LEDs and TFFC visible LEDs with III-nitride micro-domes.

Name thesis:degree_name

Master of Sciences (Engineering)

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

EECS - Electrical Engineering

Grantor dc:publisher

Case Western Reserve University School of Graduate Studies

Year dc:date

2013

Author dc:creator

• Zhao, Peng

Contributors dc:contributor

• Zhao, Hongping

• Electrical Engineering
• Optics
• III-nitride light-emitting diodes
• light extraction efficiency
• deep ultraviolet
• thin-film flip-chip
• micro-domes

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=case1346876941

OAI identifier oai:identifier

oai:etd.ohiolink.edu:case1346876941