Organic light-emitting diodes (OLEDs) still suffer from limited outcoupling efficiencies. Herein, a novel technology for the enhancement of the outcoupling efficiency of OLED devices is presented. By means of electrospray deposition (ESD), the active hole-transport layer (HTL) is modified to have a reduced effective refractive index due to its porosity. A green-emitting stack is tailored to demonstrate this effect, whereas additional haze effects are to be prevented. The introduction of a low-index HTL results in a more efficient light extraction by a factor of 1.05 showing excellent agreement between experiment and simulation.
Electro‐spray deposition is an excellent and simple option to generate nanoporous and conductive hole‐transport layers with reduced effective refractive index for a more efficient light extraction in Organic Light‐emitting Diodes. KlausMeerholz and co‐workers shows this in article, number http://doi.wiley.com/10.1002/adem.201900897. Based on simulation, devices with a reduced refractive index hole‐transport layer are fabricated and yield in a significant efficiency enhancement compared to reference devices.
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