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Proceedings Paper

A novel structure of directly patterned isolating layer for organic thin-film transistor-driven organic light emitting diodes
Author(s): Yi-Kai Wang; Tsung-Hsien Lin; Jing-Yi Yan; Tzu-Wei Lee; Yu-Yuan Shen; Shu-Tang Yeh; Mei-Rurng Tseng; Po-Sheng Wu; Kuo-Tong Lin; Chia-Hsun Chen; Jia-Chong Ho
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Paper Abstract

Mono-chrome phosphorescence Organic light emitting diodes (OLEDs) operated by organic thin-film transistors (OTFTs) with a 32×32 array are fabricated with a novel method, and the results reveal a fabulous demonstration. The later isolation, which segregated source/drain electrodes and an OLED cathode, was designed in our OTFT-OLED pixel. In the OTFT-OLED process; we used the polymer isolating layer which was deposited by spin coating and patterned by traditional photo-lithography before the organic semiconductor and OLED deposition. However, the residue polymer affect of OTFT electric properties which have poor mobility (5×10-4 cm2/V-s), a lower on/off ratio (~103), and a positive threshold voltage (4.5 V), and devices, have poor uniformity. Using UV-Ozone treatment could enhance OTFT mobility (2×10-2 cm2/V-s) and permit higher devices uniformity, but the threshold voltage would still have a positive 5.1 V. This threshold voltage was not a good operation mode for display application because this operation voltage was not fit for our driving systems. In order to overcome this problem, a new structure of OTFT-OLED pixel was designed and combined with a new-material isolating layer process. This new process could fabricate an OTFT-OLED array successfully and have a nice uniformity. After the isolating layer process, OTFT devices have a higher mobility (0.1×10-2 cm2/V-s), a higher on-off ratio (~107) a lower threshold voltage (-9.7 V), and a higher devices uniformity.

Paper Details

Date Published: 13 September 2007
PDF: 8 pages
Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665819 (13 September 2007); doi: 10.1117/12.733588
Show Author Affiliations
Yi-Kai Wang, Industrial Technology Research Institute (Taiwan)
Tsung-Hsien Lin, Industrial Technology Research Institute (Taiwan)
Jing-Yi Yan, Industrial Technology Research Institute (Taiwan)
Tzu-Wei Lee, Industrial Technology Research Institute (Taiwan)
Yu-Yuan Shen, Industrial Technology Research Institute (Taiwan)
Shu-Tang Yeh, Industrial Technology Research Institute (Taiwan)
Mei-Rurng Tseng, Industrial Technology Research Institute (Taiwan)
Po-Sheng Wu, Industrial Technology Research Institute (Taiwan)
Kuo-Tong Lin, Industrial Technology Research Institute (Taiwan)
Chia-Hsun Chen, Industrial Technology Research Institute (Taiwan)
Jia-Chong Ho, Industrial Technology Research Institute (Taiwan)


Published in SPIE Proceedings Vol. 6658:
Organic Field-Effect Transistors VI
Zhenan Bao; David J. Gundlach, Editor(s)

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