Optimization of organic light-emitting diode containing hydrochlorosilole electron transport layer through impedance spectroscopy analysis

Impedance spectroscopy measurements provide resistance, conductance and quality factor which play key roles to find optimum thickness of electron transport layer (ETL) in organic devices. The optimized thickness of hydrochlorosilole in an electron only device was determined to be 7 nm by the minimum contact and bulk resistances along with the maximum conductance and quality factor. We confirm that the optimized thickness from the electron only device works as the optimum condition for optical emission for multi-layer light emitting diodes which contain hydrochlorosilole.

► Hydrochlorosilole was used as an electron transport layer (ETL) in organic devices.
► Optimum thickness of the ETL in electron only device was found by AC impedance spectroscopy.
► The optimized thickness of ETL in electron only device was applied to a multi-layered OLED system.
► OLED with the optimized ETL gives the maximum light emitting efficiency.