Analysis of impedance spectroscopy with interfacial charges by molecular orientation in aged co-host organic light-emitting diodes
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초록
내용
We investigated the charge injection and accumulation characteristics in an organic light-emitting diode (OLED) induced by spontaneous orientation polarization (SOP) of organic molecules. SOP improves the performance of OLED devices by controlling the interfacial charge density between organic layers in the device. In this study, the OLED device consisting of ITO/molybdeneum trioxide (MoO3)/4,4',4''-tris(carbazol-9-yl)triphenylamine (TCTA) /TCTA:1,3,5-tris(N-phenylbenzimidizol-2-yl)benzene (TPBi):iridium(III)bis(2-phenylpyridine)acetylacetonate (Ir(ppy)2(acac))/TPBi/LiF/Al was fabricated in order to investigate the degradation effect of SOP in an aged OLED. Based on impedance spectroscopy analysis of the pristine and aged devices, the capacitance and resistance of each organic layer within the OLEDs were simulated and the results showed a decreased effect of SOP in the aged device.