Modification of LED radiation pattern by implementation of 1D Fresnel structure in the surface

Ivana Lettrichova; Dusan Pudis; Agata Laurencikova; Peter Gaso; Lubos Suslik; Daniel Jandura; Jozef Novak

doi:10.1117/12.2265815

30 May 2017 Modification of LED radiation pattern by implementation of 1D Fresnel structure in the surface

Ivana Lettrichova, Dusan Pudis, Agata Laurencikova, Peter Gaso, Lubos Suslik, Daniel Jandura, Jozef Novak

Proceedings Volume 10249, Integrated Photonics: Materials, Devices, and Applications IV; 102490T (2017) https://doi.org/10.1117/12.2265815
Event: SPIE Microtechnologies, 2017, Barcelona, Spain

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.

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Ivana Lettrichova, Dusan Pudis, Agata Laurencikova, Peter Gaso, Lubos Suslik, Daniel Jandura, and Jozef Novak "Modification of LED radiation pattern by implementation of 1D Fresnel structure in the surface", Proc. SPIE 10249, Integrated Photonics: Materials, Devices, and Applications IV, 102490T (30 May 2017); https://doi.org/10.1117/12.2265815

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