Low Work Function 2.81 eV Rb2 CO3 -Doped Polyethylenimine Ethoxylated for Inverted Organic Light-Emitting Diodes

ACS Applied Materials & Interfaces
Jeonggi KimJin Jang

Abstract

We report a low work function (2.81 eV), Rb2CO3-doped polyethyleneimine ethoxylated (PEIE) which is used for highly efficient and long-lifetime, inverted organic light-emitting diodes (OLEDs). Doping Rb2CO3 into PEIE decreases the work function of Li-doped ZnO (LZO) by 1.0 eV and thus significantly improves electron injection ability into the emission layer (EML). The inverted OLED with PEIE:Rb2CO3 interfacial layer (IL) exhibits higher efficiency and longer operation lifetime than those of the device with a PEIE IL. It is found also that Mg-doped ZnO (MZO) can be used instead of LZO as electron transporting layer. Rb2CO3 shows a low work function of 2.81 eV. The OLED with MZO/PEIE:Rb2CO3 exhibits low operating voltage of 5.0 V at 1000 cd m-2 and low efficiency roll-off of 11.8% at high luminance of 10 000 cd m-2. The results are due to the suppressed exciton quenching at the MZO/organic EML interface.

References

May 16, 2009·Nature·Sebastian ReinekeKarl Leo
Mar 26, 2011·Chemical Society Reviews·Gianluca M Farinola, Roberta Ragni
Jul 8, 2011·Advanced Materials·Sunkook KimSang Yoon Lee
Sep 11, 2013·Advanced Materials·Caroline MurawskiMalte C Gather
Apr 8, 2014·ACS Applied Materials & Interfaces·Sebastian StolzGerardo Hernandez-Sosa
Apr 3, 2015·ACS Applied Materials & Interfaces·Stefan HöfleAlexander Colsmann
Jul 28, 2015·Advanced Materials·Takayuki ChibaJunji Kido

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Citations

May 22, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shuanglong TangChongshen Guo
Aug 19, 2020·ACS Applied Materials & Interfaces·Li WanAlasdair J Campbell
Jun 13, 2019·ACS Applied Materials & Interfaces·Shizuka KawamuraHirohiko Fukagawa
Aug 28, 2021·ACS Applied Materials & Interfaces·Ruiqing LiWei Huang

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