Light extraction by Lambertian sources from light emitting diodes

James R. Nagel

doi:10.1117/12.2002115

14 March 2013 Light extraction by Lambertian sources from light emitting diodes

James R. Nagel

Proceedings Volume 8619, Physics and Simulation of Optoelectronic Devices XXI; 86190L (2013) https://doi.org/10.1117/12.2002115
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

Internal back-and-forth propagation of photons within a light emitting diode (LED) will naturally tend towards a Lambertian intensity profile when surface texturing is sufficiently rough. Novel designs in light extraction efficiency (LEE) can therefore benefit by optimizing under this expectation. This paper develops a framework for calculating LEE from a planar LED structure with textured surface features under the assumption of Lambertian intensity within the substrate. The method can estimate the total LEE value when given a substrate width w, an attenuation constant α, and the transmittance function T(θ,Φ) through the top interface. We demonstrate our theory on a pyramidal surface texture over a GaSb substrate at 4.5 μm wavelength by computing the expected LEE as a function of w.

Citation Download Citation

James R. Nagel "Light extraction by Lambertian sources from light emitting diodes", Proc. SPIE 8619, Physics and Simulation of Optoelectronic Devices XXI, 86190L (14 March 2013); https://doi.org/10.1117/12.2002115

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