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Proceedings Paper

A new door for molecular-based organic light-emitting diodes
Author(s): Jwo-Huei Jou; Cheng-Chung Chen; Wei-Ben Wang; Mao-Feng Hsu; Chun-Jan Wang; Chin-Ti Chen; Min-Fei Wu; Hung-Yang Chen; Jing-Jong Shyue; Chih-Lung Chin
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Paper Abstract

Long life-time molecular-based organic electronics, such as organic light-emitting diodes (OLEDs), organic solar cells, or organic transistors etc, inevitably demand their constituent molecules to be highly thermal-stable. Coupling with special needs in molecular design, the resultant increasing molecular weight (MW) will eventually make the molecules difficult to deposit if via dry-process, while using wet-process would frequently result in undesired relatively poorer efficiency. Surprisingly, two high-molecule composing OLEDs with relatively high-efficiency were obtained by using solution-process. A blue OLED with a blue dye doped in a novel high-MW, wide band-gap host, 3,5-di(9H-carbazol-9-yl) tetraphenylsilane (SimCP2), yielded 24 lm/W (38 cd/A) at 100 nits, and a green OLED using a novel high-MW green dye, bis[5-methyl-7-trifluoromethyl-5H-benzo (c)(1,5) naphthyridin-6-one] iridium (picolinate) (CF3BNO), yielded 70 lm/W (89 cd/A), while their dry-processed blue and green counterparts yield 1.7 and 21 lm/W, respectively. Importantly, although the comparatively high MW has made the resulting molecules extremely difficult to vacuum-evaporate and has resulted in poor device performance, the wet-process has been proven effective in fabricating two high molecule-containing OLEDs with relatively high efficiency. The successful demonstration suggests that the same approach may as well be extended to other organic devices that compose or should compose high molecules.

Paper Details

Date Published: 2 September 2008
PDF: 10 pages
Proc. SPIE 7051, Organic Light Emitting Materials and Devices XII, 70510P (2 September 2008); doi: 10.1117/12.794184
Show Author Affiliations
Jwo-Huei Jou, National Tsing Hua Univ. (Taiwan)
Cheng-Chung Chen, National Tsing Hua Univ. (Taiwan)
Wei-Ben Wang, National Tsing Hua Univ. (Taiwan)
Mao-Feng Hsu, National Tsing Hua Univ. (Taiwan)
Chun-Jan Wang, National Tsing Hua Univ. (Taiwan)
Chin-Ti Chen, Academia Sinica (Taiwan)
Min-Fei Wu, Academia Sinica (Taiwan)
Hung-Yang Chen, Academia Sinica (Taiwan)
Jing-Jong Shyue, Academia Sinica (Taiwan)
Chih-Lung Chin, ITRI (Taiwan)

Published in SPIE Proceedings Vol. 7051:
Organic Light Emitting Materials and Devices XII
Franky So; Chihaya Adachi, Editor(s)

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