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Low‐Refractive Index Layers in Organic Light‐Emitting Diodes via Electrospray Deposition for Enhanced Outcoupling Efficiencies

With this article we present a novel technology for the enhancement of the outcoupling efficiency of OLED devices.

Article’s abstract:
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.

Read the full article here: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.201900897