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Proceedings Paper

The effect of NPB morphology on OLEDs optoelectronic characteristics
Author(s): Yurong Jiang; Zhinong Yu; Wei Xue
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Paper Abstract

N,N'-bis(lnaphthyl)N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) surface morphologies deposited on different temperature substrates were investigated using atomic force microscopy(AFM). NPB is an organic materials often used as hole transport layer(HTL) in organic light-emitting devices (OLEDs). It has been found that the NPB morphology turned from island morphology at high temperature(100°C) to grain morphology at room temperature. At the same time, the growth mode of NPB film also changed from the Volmer-Weber type to the Stranski-Krastanov type. The results show the wettability between NPB and ITO becomes worse when the substrate temperature increases, which prevents NPB from forming continuous thin film. To characterize the effect of NPB surface morphology, the devices with the structure of Glass/ITO/NPB/Alq3/Al were fabricated using NPB films deposited at different substrate temperature and their performances were compared. The results show that the NPB morphology has significant effects on the performance of OLEDs.

Paper Details

Date Published: 26 January 2006
PDF: 6 pages
Proc. SPIE 6030, ICO20: Display Devices and Systems, 603007 (26 January 2006); doi: 10.1117/12.667363
Show Author Affiliations
Yurong Jiang, Beijing Institute of Technology (China)
Zhinong Yu, Beijing Institute of Technology (China)
Wei Xue, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 6030:
ICO20: Display Devices and Systems
Tatsuo Uchida; Xu Liu; Hang Song, Editor(s)

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