Analysis of the emission characteristics of photonic crystal LEDs

Ch. Wiesmann; K. Bergenek; N. Linder; U. T. Schwarz

doi:10.1117/12.780572

21 April 2008 Analysis of the emission characteristics of photonic crystal LEDs

Ch. Wiesmann, K. Bergenek, N. Linder, U. T. Schwarz

Author Affiliations +

Proceedings Volume 6989, Photonic Crystal Materials and Devices VIII; 69890L (2008) https://doi.org/10.1117/12.780572
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

Photonic crystals are known to enhance the extraction efficiency of LEDs and simultaneously shaping the emission pattern. In order to determine the radiation pattern we developed a model based on coupled mode theory that takes into account the lattice pattern, etch depth and the mode distribution. From a basic geometrical consideration a fundamental limit for the directionality is predicted. The calculations fit well to experimental data obtained from green InGaN LEDs incorporating a hexagonal PhC revealing a maximum directionality of 31% within 30°. Additional FDTD simulations were performed for determining quantitatively the extraction efficiency of PhC LEDs compared to LEDs with a roughened surface. Despite its lower overall extraction efficiency, the PhC LED outperforms a standard LED with surface roughening within an acceptance angle of 34° due to the higher directionality of the extracted light.

Citation Download Citation

Ch. Wiesmann, K. Bergenek, N. Linder, and U. T. Schwarz "Analysis of the emission characteristics of photonic crystal LEDs", Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 69890L (21 April 2008); https://doi.org/10.1117/12.780572

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

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.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE