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Dependence of Pt(II) based phosphorescent emitter orientation on host molecule orientation in doped organic thin films
Institution:1. CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520-IEMN, Univ. Lille, 59000 Lille, France;2. University of Monastir, Department of Physics, Microelectronics and Instrumentation Laboratory, Av de l''environnement, 5019 Monastir, Tunisia;1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, South Korea;2. Display Research Center, Samsung Display Co., 1 Samsung-ro, Giheung-gu, Yongin, Gyeonggi-do, South Korea;1. Department of Applied Chemistry, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;2. Center for Organic Photonics and Electronics Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;3. Institute of Applied Research, Vilnius University, SaulĿtekio 9-III, LT-10222 Vilnius, Lithuania;4. Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;5. International Institute for Carbon Neutral Energy Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan;1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan;2. Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO), Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan;1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi, 440-746, South Korea;2. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, South Korea
Abstract:We report that the molecular orientation of a disk-shaped Pt(II) complex dopant in organic thin films is linearly proportional to the orientation of the host molecules. We ascribe this relationship to the parallel alignment of the Pt complex with the host molecules induced by a π-π interaction. This would be caused by their planar and conjugated structure, indicating that the intermolecular interaction and steric effect play an important role. This finding can be applied to obtain a horizontal emitter orientation, resulting in highly efficient OLEDs based on Pt(II) complexes.
Keywords:Pt(II) complex  Emitting dipole orientation  Host orientation  Organic light-emitting diodes
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