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Molecular Crystals and Liquid Crystals Volume 599, 2014 - Issue 1: KJF International Conference on Organic Materials for Electronics and Photonics (KJF 2013)
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Original Articles

Improvement of Current Efficiency at High Field Regime Via Description of Roll-off Characteristic in Model Device of OLEDs

Hyeok KimPhoto-Electronic Hybrids Research Center, Korea Institute of Science and Technology, Seoul, Korea;Computational Science Group, Samsung Advanced Institute of Technology (SAIT), Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
,
Jaehoon ParkDepartment of Electronic Engineering, Hallym University, Chuncheon, Korea
,
Gyeong-Tae ParkSchool of Electronics Engineering, Kyungpook National University, Daegu, Korea
,
Youngmin NamComputational Science Group, Samsung Advanced Institute of Technology (SAIT), Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
,
Seongmin KimComputational Science Group, Samsung Advanced Institute of Technology (SAIT), Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
,
Sungjin KimComputational Science Group, Samsung Advanced Institute of Technology (SAIT), Nongseo-dong, Giheung-gu, Yongin-si, Gyeonggi-do, Korea
,
Dong-Seok SongSchool of Electronics Engineering, Kyungpook National University, Daegu, Korea
,
Jae-Hyun KimSchool of Electronics Engineering, Kyungpook National University, Daegu, Korea
,
Jin-Hyuk KwonSchool of Electronics Engineering, Kyungpook National University, Daegu, Korea
,
In-Man KangSchool of Electronics Engineering, Kyungpook National University, Daegu, Korea
,
Suyeon ParkDepartment of Electrical Engineering, Seoul National University, Shinlim-Dong, Kwanakgu, Seoul, Korea
,
Changhee LeeDepartment of Electrical Engineering, Seoul National University, Shinlim-Dong, Kwanakgu, Seoul, Korea
,
Doh-Kwon LeePhoto-Electronic Hybrids Research Center, Korea Institute of Science and Technology, Seoul, Korea
&
Jin-Hyuk BaeSchool of Electronics Engineering, Kyungpook National University, Daegu, KoreaCorrespondence[email protected]
 show all
Pages 79-85 | Published online: 17 Nov 2014
 
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Abstract

We demonstrated the effect of the field dependency of charge carrier mobility on roll-off characteristic of current efficiency. Field dependent factor in Poole-Frenkel model is controlled to describe charge balance of electron and hole concentration at high field. It is well established that roll-off characteristic is dependent upon mobility match which results in charge balance in EML. We exhibited the improvement of the roll-off characteristic of current efficiency and explained how charge balance is induced through this description.

Acknowledgment

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A4A01009807).

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