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Home  >  Journal list  >  Polymer Journal  >  Vol.49  No.1 (2017)  >  pp.149-154

Polymer Journal
<<Previous article Vol.49  No.1 (2017)   pp.149 - 154 Next article>>

Inhibition of solution-processed 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile crystallization by mixing additives for hole injection layers in organic light-emitting devices

Satoru Ohisa1, Yong-Jin Pu1, Shogo Takahashi1, Takayuki Chiba1 and Junji Kido1
1Graduate School of Organic Materials Science, Yamagata University, Yamagata, Japan

We report the inhibition of solution-processed 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) crystallization by mixing additives for the hole injection layers (HILs) in organic light-emitting devices (OLEDs). Various additives were mixed with the HAT-CN layer, including acrylates, compounds resembling HAT-CN and arylamine derivatives. Among these, the HAT-CN films mixed with ditrimethylol propane tetraacrylate (AD-TMP) and pyrazino[2,3-f][1,10]phenanthroline-2,3-dicarbonitrile (PPDN) showed a transparent appearance and high solvent resistances. The former was ascribed to the inhibition of the crystallization. We used these additives for the preparation of electron acceptor layers in charge generation layers (CGLs) of the CGL-only devices. The device prepared by mixing HAT-CN with PPDN showed a lower driving voltage and was applied to the production of an HIL in a solution-processed OLED. The device showed a lower driving voltage and a higher luminescent efficiency than those of the device containing a conventional HIL, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT:PSS).


Received: July 01, 2016 , Revised: August 09, 2016
Accepted: August 12, 2016 , Published online: September 28, 2016
© 2017 The Society of Polymer Science, Japan

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