Electrical and optical characteristics of phosphorescent organic light-emitting device with thin-codoped layer insertion |
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| Affiliation: | 1. Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taiwan;2. Department of Photonics Engineering, Yuan Ze University, Taiwan;3. Department of Electro-Optical Engineering, National United University, No. 1, Lienda, Kung-Ching Li, Miaoli 36003, Taiwan;1. Department of Bio-Nano Technology, Gachon University, Gyeonggi 461-701, Republic of Korea;2. Department of Nano-Physics, Gachon University, Gyeonggi 461-701, Republic of Korea;3. Gachon Bio-Nano Research Institute, Gyeonggi 461-701, Republic of Korea;1. Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 446-701, Republic of Korea;2. Samsung Display, OLED R&D Center, Yongin, Gyeonggi-do 446-711, Republic of Korea;3. Professional Graduate School of Flexible and Printable Electronics, Chonbuk National University, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea;4. Division of Physics and Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea;1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Department of Chemical & Biological Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea;3. Department of Materials Science and Engineering, Jungwon University, Goesan 367-805, Republic of Korea;4. School of Mechanical Engineering, Konkuk University, Seoul 143-701, Republic of Korea;5. Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Republic of Korea;1. School of Integrative Engineering, Chung-Ang University, 84 Heukseok-Ro, Dongjak-gu, Seoul 156-756, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea |
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| Abstract: | In this paper, we demonstrated the changes of electrical and optical characteristics of a phosphorescent organic light-emitting device (OLED) with tris(phenylpyridine)iridium Ir(ppy)3 thin layer (4 nm) slightly codoped (1%) inside the emitting layer (EML) close to the cathode side. Such a thin layer helped for electron injection and transport from the electron transporting layer into the EML, which reduced the driving voltage (0.40 V at 100 mA/cm2). Electroluminescence (EL) spectral shift at different driving voltage was observed in our blue OLED with (4,6-di-fluoropheny)-pyridinato-N,C2′]picolinate (FIrpic) emitter, which came from the recombination zone shift. With the incorporation of thin-codoped Ir(ppy)3, such EL spectral shift was almost undetectable (color coordinate shift (0.000, 0.001) from 100 to 10,000 cd/m2), due to the compensation of Ir(ppy)3 emission at low driving voltage. Such a methodology can be applied to a white OLED which stabilized the EL spectrum and the color coordinates ((0.012, 0.002) from 100 to 10,000 cd/m2). |
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| Keywords: | OLED Carrier injection and transport Phosphorescence |
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