Optical Enhancement in Optoelectronic Devices Using Refractive Index Grading Layers

ACS Applied Materials & Interfaces
Illhwan LeeJong-Lam Lee

Abstract

We enhanced the optical transmittance of a multilayer barrier film by inserting a refractive index grading layer (RIGL). The result indicates that the Fresnel reflection, induced by the difference of refractive indices between Si(x)N(y) and SiO2, is reduced by the RIGL. To eliminate the Fresnel reflection while maintaining high transmittance, the optimized design of grading structures with the RIGL was conducted using an optical simulator. With the RIGL, we achieved averaged transmittance in the visible wavelength region by 89.6%. It is found that the optimized grading structure inserting the multilayer barrier film has a higher optical transmittance (89.6%) in the visible region than that of a no grading sample (82.6%). Furthermore, luminance is enhanced by 14.5% (from 10,190 to 11,670 cd m(-2) at 30 mA cm(-2)) when the grading structure is applied to organic light-emitting diodes. Finally, the results offer new opportunities in development of multilayer barrier films, which assist industrialization of very cost-effective flexible organic electronic devices.

References

Jun 1, 2012·ACS Applied Materials & Interfaces·Won Min YunChan Eon Park
Oct 17, 2014·Optics Express·Sungjun KimJong-Lam Lee
Mar 20, 2015·Nature Communications·Hongkyu KangKwanghee Lee

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Citations

Aug 11, 2020·The Journal of Chemical Physics·Michael P Howard, Arash Nikoubashman
Aug 21, 2020·Journal of Colloid and Interface Science·James D TinklerIgnacio Martín-Fabiani
Dec 13, 2016·ACS Applied Materials & Interfaces·Ignacio Martín-FabianiJoseph L Keddie

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