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Proceedings Paper

Study on organic light-emitting device with more balanced charge transport
Author(s): Jiun-Haw Lee; Tien-Chun Lin; Chi-Chih Liao; F.H. Yang
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Paper Abstract

In this paper, we present the device performance of N4,N4'-Di-naphthalen-2-yl- N4, N4'-di-naphthalen-1-yl-biphenyl-4,4'-diamine (TNB) as the HTL material and bis(10-hydroxyben-zo[h]quinolinato) beryllium (Bebq2) as the ETL material. The mobility of TNB and Bebq2 is at the same order of magnitude from our time of flight (TOF) measurement. Therefore, a device with more balanced carrier transport leads to better device performance. At 10 mA/cm2, the drive voltage of the devices is as low as 3.16 V since the use of the high mobility ETL, Bebq2. The voltage variation when changing HTL thickness is nearly the same as that when changing ETL thickness. That shows the voltage drop is higher on HTL than ETL due to the use of high mobility ETL material. That also leads to the more balanced carrier transport than that in a conventional OLED. We also observed that a thinner device has longer operation lifetime that may be due to fewer traps in such a device.

Paper Details

Date Published: 12 January 2005
PDF: 6 pages
Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.576013
Show Author Affiliations
Jiun-Haw Lee, National Taiwan Univ. (Taiwan)
Tien-Chun Lin, National Taiwan Univ. (Taiwan)
Chi-Chih Liao, RiTdisplay Corp. (Taiwan)
F.H. Yang, Aixtron Taiwan Corp. (Taiwan)

Published in SPIE Proceedings Vol. 5632:
Light-Emitting Diode Materials and Devices
Gang Yu; Chuangtian Chen; Changhee Lee, Editor(s)

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