Abstract
We report on the development and detailed investigation of green phosphorescent organic light-emitting diodes (OLEDs) with porous light-scattering layers prepared by combining a simple coating of polyimide-precursor and the immersion precipitation method. With the proper choice of solvent/non-solvent system in the pore-generation process, an external quantum efficiency (EQE) of 30.8% and a power efficiency (PE) of 82.2 lm/W can be realized at a luminance of 1000 cd/m2. By analyzing the angular characteristics in terms of the luminance- and color-variation of OLEDs fabricated with various porous films, we find that the device performance is closely linked to both the light scattering from the porosity and the ray-path change, which depends on the pore shape. Raytracing optical simulation was also used to confirm that the shape-control of the pores in a porous polymer film modulates the light-outcoupling efficiency in OLEDs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
