P‐184: The Effect of Exciplex‐Type Co‐Host Emitting Layer Structure in the Lifetime of Organic Light‐Emitting Diodes

The significantly low operation lifetime of exciplex‐type host compared to the exciplex‐free host in organic light‐emitting diodes (OLEDs) was systematically investigated. In the exciplex‐type host, more bulk traps are formed compared to exciplex‐free host during constant current operation, leading to decrease in exciton generation efficiency, lowering the device operational stability.