Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 20, Pages 17318-17326Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00752
Keywords
polymer blend; electron injection layer; conjugated polyelectrolytes; polyethyleneimine; polymer light-emitting diodes
Funding
- Strategic Promotion of Innovative RAMP
- D Program from the Japan Science and Technology Agency, JST
- Center of Innovation (COI) Program from the Japan Science and Technology Agency, JST
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Electron injection layers (EILs) based on a simple polymer blend of polyethyleneimine ethoxylated (PEIE) and poly[(9,9-bis(3'-((N,N-dimethyl)-N-ethylammonium)-propy1)-2,7-fluorene)-alt-2,7- (9,9-dioctylfluorene)] (PFN-Br) can suppress the dependence of organic light-emitting device (OLED) performance on thickness variation compared with single PEIE or PFN-Br EILs. PETE and PFN-Br were compatible with each other and PFN-Br uniformly mixed in the PEIE matrix. PEN-Br in PETE formed more fluorene-fluorene pairs than PFN-Br alone. In addition, PEIE:PFN-Br blends reduced the work function (WF) substantially compared with single PEIE or PFN-Br polymer. PEIE:PFN-Br blends were applied to EILs in fluorescent polymer-based OLEDs. Optimized PEIE:PFN-Br blend EIL-based devices presented lower driving voltages and smaller dependences of device performance on EIL thickness than single PEIE or PFN-Br-based devices. These improvements were attributed to electron-transporting fluorene moieties, increased fluorene-fluorene pairs working as channels of electron transport, and the large WF reduction effect of PEIE:PFN-Br blends.
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