Abstract
The profile of the emission zone and dipole orientation of dopants in organic light‐emitting diodes (OLEDs) are two typical optical properties and have great impacts on the device performance. In the present study, these properties were investigated using in‐situ angle resolved polarized radiation and optical simulations. The results show that the emission is generated within a ~9 nm wide sheet at the prime layer/emissive layer (EML) interface, and 94% of the dipoles are horizontally aligned.
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