A simple effective method to improve light out-coupling in organic light-emitting diodes by introducing pyramid-based texture structure |
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| Affiliation: | 1. School of Material Science and Engineering, Shanghai University, Shanghai 200072, China;2. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai 200072, PR China;1. Dept. of Electronic Engineering, Pusan National University, Pusan (Busan) 609-735, Republic of Korea;2. School of Mechanical Engineering, Pusan National University, Pusan (Busan) 609-735, Republic of Korea;1. Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | This paper showed a very simple method to increase the light extraction of organic light-emitting diodes (OLEDs) by attaching an inverted pyramid texture film to them. The texture film was fabricated by transferring the pyramid-based textured morphology of mono-crystalline silicon surface using a printing process. Compared to the reference device, our results showed a great improvement in the current efficiency (+37.0%) and external quantum efficiency (+36.6%) at a current density of 100 mA/cm2. Furthermore, the EL spectrum and CIE coordinates of the OLEDs did hardly vary with the introduction of the texture film and variation of viewing angles, and the OLED with the texture film was proved to be a perfect Lambertian emitter, which suggested that the utilization of this method was a promising approach for the development of OLEDs and could be suggestive conduction to EL lightening and backlight. |
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| Keywords: | Inverted pyramid Organic light-emitting diodes (OLEDs) External quantum efficiency (EQE) Printing process |
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