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Proceedings Paper

Modification of LED radiation pattern by implementation of 1D Fresnel structure in the surface
Author(s): Ivana Lettrichova; Dusan Pudis; Agata Laurencikova; Peter Gaso; Lubos Suslik; Daniel Jandura; Jozef Novak
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Paper Abstract

In this contribution, we present modification of far field of light emitting diode (LED) with implemented Fresnel structure in the LED surface. Fresnel structures were prepared in one-dimensional arrangement with two different foci f1 = 12.5 μm and f2 = 1 cm. Structures were etched directly in the LED emitting surface using electron beam lithography with the etched depth for the structure with f1 and f2 app. 200 nm and 400 nm, respectively. Due to application of these structures, LED far field narrowing was observed, which is documented by goniophotometer measurements. For the structure with f1 and f2, the intensity decrease for angles ±30° – ±50° is app. 3-4% and 5-6%, respectively, in comparison to the Lambertian profile.

Paper Details

Date Published: 30 May 2017
PDF: 6 pages
Proc. SPIE 10249, Integrated Photonics: Materials, Devices, and Applications IV, 102490T (30 May 2017); doi: 10.1117/12.2265815
Show Author Affiliations
Ivana Lettrichova, Univ. of Žilina (Slovakia)
Dusan Pudis, Univ. of Žilina (Slovakia)
Agata Laurencikova, Institute of Electrical Engineering (Slovakia)
Peter Gaso, Univ. of Žilina (Slovakia)
Lubos Suslik, Univ. of Žilina (Slovakia)
Daniel Jandura, Univ. of Žilina (Slovakia)
Jozef Novak, Institute of Electrical Engineering (Slovakia)

Published in SPIE Proceedings Vol. 10249:
Integrated Photonics: Materials, Devices, and Applications IV
Jean-Marc Fédéli; Laurent Vivien, Editor(s)

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