Aluminum-Modified Molybdenum Trioxide for Electron Injection in Inverted Organic Light-Emitting Diodes

Author

Shihong Ouyang ; Yingtao Xie ; Dongping Wang ; Dalong Zhu ; Xin Xu ; Te Tan ; Hon Hang Fong

Author_Institution

Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai, China

Volume

11

Issue

3

fYear

2015

fDate

42064

Firstpage

273

Lastpage

277

Abstract

Electron injection using ambient stable electrodes is essential for organic light-emitting diodes (OLEDs), particularly for the bottom electrode of the inverted OLEDs. Here, a metal-oxide-based highly transparent electron injection layer (EIL) is proposed. This metal-oxide-based EIL consists of thin layer of aluminum (Al)-modified molybdenum trioxide (MoO3). It is demonstrated that the surface of the MoO3 layer can be chemically reduced by a very thin overlayer of Al (1 nm), resulting in a lower effective surface work function as well as introducing a number of gap states in the reduced molybdenum oxide layer. With this surface Al-doped MoO3 EIL, efficient inverted OLEDs are demonstrated over typical conductive electrodes such as indium tin oxide (ITO) and poly(3,4-ethylenedioxythio-phene): poly(styrenesulfonate) (PEDOT:PSS).

Keywords

aluminium; electrodes; molybdenum compounds; organic light emitting diodes; work function; Al-MoO₃; ITO; OLED; aluminum-modified molybdenum trioxide; ambient stable electrodes; effective surface work function; electron injection; gap states; indium tin oxide conductive electrodes; inverted organic light-emitting diodes; poly(3,4-ethylenedioxythio-phene):poly(styrenesulfonate) conductive electrodes; size 1 nm; Electrodes; Indium tin oxide; Metals; Organic light emitting diodes; Performance evaluation; Surface morphology; Surface treatment; Electron injection; molybdenum oxide; organic light emitting diodes;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2014.2384741

Filename

6994238