Injection and charge transport processes of polymer light emitting diodes

Author

Wedel, Armin ; Janietz, S. ; Danz, R.

Author_Institution

Fraunhofer-Inst. of Appl. Polymer Res., Teltow, Germany

fYear

1996

fDate

25-30 Sep 1996

Firstpage

373

Lastpage

377

Abstract

We investigated thianthrene (TH) and 2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD), which is known to be a good scintillator dye and have good electron transport properties, separately by cyclic voltammetry in solution. All electrochemical measurements were performed in solutions of N-methylporrolidone in the reduction region and in acetonitrile (for PBD) and dichloromethane (for TH) in the oxidation direction. We also investigated the current-voltage (I-U) characteristics for testing the diode character and capacitance-voltage (C-V) behaviour of different single and double layer structures to describe the function of such devices. For LED fabrication, TH and PBD were mixed with 20% polycarbonate (PC) dissolved in chloroform, so that a mixed single layer with a thickness of 150 nm as an LED blend structure was built up

Keywords

capacitance; electroluminescence; light emitting diodes; organic compounds; oxidation; polymer blends; reduction (chemical); voltammetry (chemical analysis); 2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole; LED blend structure; LED fabrication; N-methylporrolidone solution; acetonitrile solution; capacitance-voltage behaviour; charge transport processes; current-voltage characteristics; cyclic voltammetry; dichloromethane solution; double layer structures; electrochemical measurements; electroluminescence spectrum; electron transport properties; injection processes; mixed single layer; oxidation direction; polycarbonate; polymer light emitting diodes; reduction region; scintillator dye; single layer structures; thianthrene; Charge carrier processes; Electrodes; Electroluminescent devices; Light emitting diodes; Luminescence; Nonhomogeneous media; Organic light emitting diodes; Organic materials; Oxidation; Performance evaluation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578105

Filename

578105