Investigation of Solution-Processed Ultrathin Electron Injection Layers for Organic Light-Emitting Diodes

被引：55

作者：

Stolz, Sebastian ^{[1
,2
]}

Scherer, Michael ^{[2
,3
]}

Mankel, Eric ^{[2
,4
]}

Lovrincic, Robert ^{[2
,3
]}

Schinke, Janusz ^{[2
,3
]}

Kowalsky, Wolfgang ^{[2
,3
]}

Jaegermann, Wolfram ^{[4
]}

Lemmer, Uli ^{[1
,5
]}

Mechau, Norman ^{[1
,2
]}

Hernandez-Sosa, Gerardo ^{[1
,2
,5
]}

机构：

[1] Karlsruhe Inst Technol, Light Technol Inst, D-76131 Karlsruhe, Germany

[2] InnovationLab GmbH, D-69115 Heidelberg, Germany

[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Hochfrequenztech, D-38106 Braunschweig, Germany

[4] Tech Univ Darmstadt, Surface Sci Div, Inst Mat Sci, D-64287 Darmstadt, Germany

[5] Karlsruhe Inst Technol, Inst Microstruct Technol, D-76344 Eggenstein Leopoldshafen, Germany

来源：

ACS APPLIED MATERIALS & INTERFACES | 2014年 / 6卷 / 09期

关键词：

polyethylenimine; polyethylenimine-ethoxylated; injection layers; photoelectron spectroscopy; OLEDs; printed electronics; PHENYLENE VINYLENE OLIGOMER; CATHODE; POLYELECTROLYTES; DEGRADATION;

D O I：

10.1021/am500287y

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We study two types of water/alcohol-soluble aliphatic amines, polyethylenimine (PEI) and polyethylenimine-ethoxylated (PETE), for their suitability as electron injection layers in solution-processed blue fluorescent organic light-emitting diodes (OLEDs). X-ray photoelectron spectroscopy is used to determine the nominal thickness of the polymer layers while ultraviolet photoelectron spectroscopy is carried out to determine the induced work-function change of the silver cathode. The determined work-function shifts are as high as 1.5 eV for PEI and 1.3 eV for PEIE. Furthermore, atomic force microscopy images reveal that homogeneous PEI and PEIE layers are present at Finally, we solution prepare blue emitting polymer-based OLEDs using PEI/PEIE in combination with Ag as cathode layers. Luminous efficiency reaches 3 and 2.2 cd A(-1), whereas maximum luminance values are as high as 8000 and 3000 cd m(-2) for PEI and PETE injection layers, respectively. The prepared devices show a comparable performance to Ca/Ag OLEDs and an improved shelf lifetime.

引用

页码：6616 / 6622

页数：7

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