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Updated: Oct 5, 2025
Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Enhanced performance of solution-processed OLEDs by altering the molecular transition dipole moment orientation of
Shuai Wang1, Zhongchang Zhu1, Chaojun Shi1
1School of Physical Science and Information Technology, Liaocheng University, Shandong 252059, China; Shandong Provincial Key Laboratory of Optical Communication Science and Technology, Shandong 252059, China.
Abstract:
Transition dipole moment orientation is one of the crucial factors, which can enhance the performance of organic light-emitting diodes (OLEDs). In this work, the transition dipole moment orientation of the host-guest emission layers (EMLs) prepared by solution method annealed at different temperatures were systematically studied by analyzing the angle-dependent PL spectrum. When the EMLs of 2DPAc-MPM (20 wt%): DPEPO was annealed at the temperature of 115 °C, the photoluminescence quantum yield (PLQY) was enhanced to 78%±3.5%, and the vertical dipole ratio was reduced to 0.34. The lower vertical orientation of transition dipoles is conducted to improve the electron and hole mobility, which was testified by the hole and electron only devices. The lower vertical dipole ratio, higher PLQY and carrier mobility together enhanced the performance of solution processed OLEDs.
