https://scholars.lib.ntu.edu.tw/handle/123456789/580993
標題: | Effect of carrier-transporting layer on blue phosphorescent organic light-emitting diodes | 作者: | Lin B.-Y. Chen C.-H. Lin T.-C. JIUN-HAW LEE Chiu T.-L. |
公開日期: | 2021 | 卷: | 8 | 期: | 4 | 來源出版物: | Photonics | 摘要: | This study presented the effects of carrier-transporting layer (CTL) on electrolumines-cence (EL) performance of a blue phosphorescent organic light-emitting diodes (PHOLEDs) with electron transporting host based on three kinds of electron-transporting layers (ETLs) includ-ing 3-(4-biphenyl-yl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ), diphenyl-bis[4-(pyridin-3-yl)phenyl]silane (DPPS) and 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB) and two kinds of hole-transporting layers (HTLs) such as 4,4′-bis[N-1-naphthyl-N-phenyl-amino]biphenyl (NPB), 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC). The carrier recombination and exciton formation zones in blue PHOLEDs strongly depend on the carrier mobility of CTLs and the layer thickness, especially the carrier mobility. Between ETLs and HTLs, the high electron mobility of ETL results in a lower driving voltage in blue PHOLEDs than the high hole mobility of HTL did. In addition, layer thickness modulation is an effective approach to precisely control carriers and restrict carriers within the EML and avoid a leakage emission of CTL. For CTL pairs in OLEDs using the electron transporting host system, ETLs with low mobility and also HTLs with high hole mobility are key points to confine the charge in EML for efficient photon emission. These findings show that appropriate CTL pairs and good layer thickness are essential for efficient OLEDs. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105141825&doi=10.3390%2fphotonics8040124&partnerID=40&md5=ab6012961cf74db780e989a7e155a1ee https://scholars.lib.ntu.edu.tw/handle/123456789/580993 |
ISSN: | 23046732 | DOI: | 10.3390/photonics8040124 |
顯示於: | 電機工程學系 |
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