Optimisation of pattern geometry and investigations of physical mechanisms contributing to improved light extraction in patterned substrate LEDs

Martin D. B. Charlton; Sean Linn

doi:10.1117/12.874187

9 February 2011 Optimisation of pattern geometry and investigations of physical mechanisms contributing to improved light extraction in patterned substrate LEDs

Martin D. B. Charlton, Sean Linn

Author Affiliations +

Proceedings Volume 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV; 795419 (2011) https://doi.org/10.1117/12.874187
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

In this paper we investigate the use of a patterned layer placed at the substrate / GaN interface region of a p-side up LED to improve light extraction and investigate the optimization of performance geometry by adjustment of geometrical parameters associated with the shaped structures including: side wall angle, side wall curvature, height and lattice constant. Performance is in each case evaluated in terms of angular extraction efficiency and far field angular beam profile. Comparisons are made between conventional large pitch patterned substrate (PSS) designs which have multiple wavelength length scales, and photonic crystal lattices which have a (sub) wavelength length scale. Physical mechanisms giving rise to the improvements are identified and discussed in each case. Overall a maximum improvement in extraction efficiency of 66% was obtained for a 4500nm pitch lattice of truncated cones.

Citation Download Citation

Martin D. B. Charlton and Sean Linn "Optimisation of pattern geometry and investigations of physical mechanisms contributing to improved light extraction in patterned substrate LEDs", Proc. SPIE 7954, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XV, 795419 (9 February 2011); https://doi.org/10.1117/12.874187

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

Includes PDF, HTML & Video, when available