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Open AccessArticle

Electro-Optical Performance of Organic Thin-Film Using HAT(CN)6 between Anode and Organic Materials

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School of Electrical, Electronic and Control Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea
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Division of Smart Electrical and Electronic Engineering, Silla University, 140 Baegyang-daero (Blvd) 700beon-gil (Rd), Sasang-gu, Busan 46958, Korea
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 648; https://doi.org/10.3390/coatings9100648
Received: 3 September 2019 / Revised: 2 October 2019 / Accepted: 6 October 2019 / Published: 9 October 2019
We report the electro-optical properties of an organic thin-film by varying the thickness of 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT(CN)6), included therein as an interlayer. Devices with HAT(CN)6, which are 7 nm thin films used as interlayers, exhibited good current density–voltage characteristics due to an improved hole injection barrier resulting from carrier ladder effects and carrier transport phenomena. The device without an interlayer showed the worst driving voltage characteristics due to the hole injection barrier. At low driving voltages, a device using 7 nm HAT(CN)6 as an interlayer exhibited a current density about 9.9 times higher than that of a device using 20 nm HAT(CN)6, and showed a current density about 9600 times higher than that of a device without an interlayer. Due to the proper carrier balance, the device using 7 nm HAT(CN)6 as an interlayer achieved a maximum current efficiency of 10.8 cd/A, which was the highest among the devices studied. This shows that the electro-optical properties of devices using HAT(CN)6 as an interlayer are dominated by the holes. View Full-Text
Keywords: current density; current efficiency; organic light-emitting diodes; 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile current density; current efficiency; organic light-emitting diodes; 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile
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MDPI and ACS Style

Park, H.-G.; Park, S.-G. Electro-Optical Performance of Organic Thin-Film Using HAT(CN)6 between Anode and Organic Materials. Coatings 2019, 9, 648.

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