Random wrinkle structures for spectrum preserved warm white organic light emitting diodes

Surface wrinkles of mesoscopic size were formed by a single photocuring process of an in-house synthesized linear liquid pre-polymer. The linear relationship between the amplitude and the period of the wrinkles indicates the presence of constant compressive strain during the wrinkling process. The stiffness ratio of the hard film to the soft foundation decreases as the initial film becomes thinner, providing a quantitative measure for estimating the wrinkle size. As an application, mesoscopic wrinkles were investigated as optical structures for enhanced light outcoupling and angular spectral stability of red, green, blue, and white organic light emitting diodes. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

Surface wrinkles of mesoscopic size were formed by photocuring of a synthesized linear liquid pre-polymer. The relationship between wrinkle amplitude and period indicates constant compressive strain. The stiffness ratio between the film and foundation decreases as the initial film becomes thinner, providing a measure for estimating wrinkle size. Mesoscopic wrinkles were investigated as optical structures for enhancing light outcoupling and spectral stability of organic light emitting diodes.