Inverted Hybrid Inorganic–Organic Light-Emitting Diodes With Balanced Charge Injection

Author

Cao, X.A. ; Acharya, Raj ; Li, X.M.

Author_Institution

Dept. of Comput. Sci. & Electr. Eng., West Virginia Univ., Morgantown, WV, USA

Volume

10

Issue

7

fYear

2014

fDate

Jul-14

Firstpage

548

Lastpage

552

Abstract

Green phosphorescent inverted hybrid inorganic-organic light-emitting diodes (IHyLEDs) based on a simplified organic layer/ WO₃ structure have been demonstrated. The WO₃ layer enabled facile hole injection and transport, which was balanced by efficient electron injection from the indium-tin-oxide (ITO) cathode overcoated with nanometer-thick Ca. The IHyLEDs had a turn-on voltage of 6 V. At 20 mA/cm², it reached a luminance of 8133 cd/m ² and a current efficiency of 40 cd/A, which were 43% higher than a similar IHyLED with a conventional Al/LiF electron injection layer. The IHyLEDs with Ca also exhibited improved reliability under constant-current stressing at 20 mA/cm².

Keywords

LED displays; coatings; electrochemical electrodes; organic light emitting diodes; phosphorescence; reliability; tungsten compounds; Al-LiF electron injection layer; IHyLED; ITO cathode; WO₃; balanced charge injection; constant-current stressing; efficient electron injection; facile hole injection; facile hole transport; green phosphorescent inverted hybrid inorganic-organic light-emitting diode; indium-tin-oxide cathode; nanometer-thick Ca; overcoating; reliability; simplified organic layer-WO₃ structure; voltage 6 V; Active matrix organic light emitting diodes; Cathodes; Charge carrier processes; Educational institutions; Indium tin oxide; Thin film transistors; Electroluminescence; hybrid junctions; light-emitting diodes (LEDs); organic compounds;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2014.2306657

Filename

6742600