Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5366581 | Applied Surface Science | 2009 | 4 Pages |
The stability of organic light-emitting devices with a spin-coated film of 4,4â²,4â³-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) as hole-injection layer (HIL) was investigated. The lifetime of this device is increased to 40Â 900Â h (with an initial luminance of 100Â cd/m2), which is 2.7 times as large as that of the control device with a vacuum-deposited film of m-MTDATA as HIL. A significant feature with this method is that the performance and the operational stability of the device with spin-coated HIL are little attenuated by the rough substrate coated by the indium-tin oxide film. The surface morphology of the solution-processed m-MTDATA thin film is quite even and uniform, and it acts as a smoothing layer in the device, which leads to the stability enhancement of the device.