30 May 2017 Modification of LED radiation pattern by implementation of 1D Fresnel structure in the surface
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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, Ivana Lettrichova, Dusan Pudis, Dusan Pudis, Agata Laurencikova, Agata Laurencikova, Peter Gaso, Peter Gaso, Lubos Suslik, Lubos Suslik, Daniel Jandura, Daniel Jandura, Jozef Novak, 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); doi: 10.1117/12.2265815; https://doi.org/10.1117/12.2265815

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