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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]

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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.

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

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

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