Patent ID: 8497155

Claim:
A method of making an organic light emitting diode (OLED) device, the method comprising: disposing a first layer comprising a first transparent conductive coating (TCC), directly or indirectly, on a glass substrate; planarizing an outermost major surface of the first layer comprising the first TCC by exposing the outermost major surface of the first layer comprising the first TCC to an ion beam wherein, following said planarizing, the first layer has an arithmetic mean value RMS roughness (Ra) of less than 1.5 nm; disposing a hole transporting layer (HTL) and an electron transporting and emitting layer (ETL), directly or indirectly, on the planarized outermost major surface of the first layer comprising the first TCC; disposing a second layer comprising a second TCC, directly or indirectly, on the HTL and the ETL.