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Samil Kho,Minsu Kim,Sunyoung Sohn,Donggeun Jung,Jinhyo Boo,Seonghoon Jeong,Sanghee Ko Park 한국진공학회(ASCT) 2005 Applied Science and Convergence Technology Vol.14 No.4
For the longevity of OLEDs, passivation of OLEDs is an important process step since organic materials used in OLEDs are very vulnerable to moisture. In this work, the passivation effect of the plasma polymerized para-xylene (PPpX) layers was studied. The PPpX layers deposited by PECVD were formed on top of the cathode with various plasma powers of 50?90 W. Passivation effect of PPpX was significantly dependent upon the deposition plasma power of the PPpX film. The lifetime of OLEDs with the 70 W deposited PPpX passivation layer was about 5 times longer than that of the control device.
Samil Kho 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Insertion of plasma-polymerized para-xylene (PPpX), formed by using plasma-enhanced chemicalvapor deposition (PECVD) under proper conditions, between the Al bottom cathode and the Alq3 enhanced the performance of top-emission inverted organic light-emitting diodes (TEIOLED) with a glass/Al/Alq3/TPD/ITO structure. The TEIOLED with PPpX deposited for 3 sec showed an external quantum efficiency about 3 times higher than without PPpX. X-ray photoelectron spectroscopy suggested the existence of PPpX between the Alq3 emitting layer and the Al bottom cathode. The PPpX cathode interfacial layer is thought to contribute to the device’s performance improvement by electron injection enhancement.