Enhanced performance of blue OLED with water/alcohol soluble conjugated polymer as electron injection layer

Document Type

Article

Publication Date

2-1-2021

Abstract

In this work, a water/alcohol-soluble conjugated polymer poly (9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dih exylfluorene)] (PFNC6) is synthesized and the photophysical properties are investigated. Subsequently, it is tested as electron injection layer in a blue emitting OLED with PFO. The maximum current efficiency (CE) and external quantum efficiency (EQE) of the device increased by 3 times to 0.75 cd/A and 0.66%. Further enhancement in the OLED performance is obtained when a bilayer electron injection consisting of PFNC6 and LiF are used where the maximum CE is 2.16 cd/A and the maximum EQE is 1.55%. Measurement with electron-only-devices confirmed that the electron mobility is increased for the device with PFNC6 as compared to the control device. Furthermore, higher V-bi is obtained in photovoltaic measurement when PFNC6 is used. As a result, the electron injection barrier is reduced and electron injection is more efficient.

Keywords

OLED, Water/alcohol soluble conjugated polymer, Electron injection layer, Electron injection barrier, Interface dipole, Spin coating

Publication Title

Synthetic Metals

Divisions

Science

Funders

Ministry of Education, Malaysia[FRGS/1/2019/STG07/MMU/02/1],Ministry of Science and Technology of Taiwan (MOST)

Volume

272

Publisher

Elsevier Science SA

Publisher Location

PO BOX 564, 1001 LAUSANNE, SWITZERLAND

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