White-colour electroluminescence from porous-silicon diodes capped with organic conductive adduct

Author

Lara, J. Antipán ; Kathirgamanathan, P.

Author_Institution

Centre for Electron. Mater. Eng., South Bank Univ., London, UK

Volume

147

Issue

5

fYear

2000

fDate

10/1/2000 12:00:00 AM

Firstpage

363

Lastpage

369

Abstract

Organic charge-transfer conductive adducts of tetrathiafulvalene (TTF) and bis (ethylenedithio) tetrathiafulvalene (ET) are proposed as materials for top electrical contacts in porous-silicon-based light-emitting devices. Semitransparent conductive adduct coatings were produced by impregnating PSi layers with a solution containing the desired adduct. Improvement in brightness (2.5×10³ fold) and luminous efficiency (10⁴ fold) have been achieved. Devices made with top contacts of TTF(NO₃)_0.55 and ET (NO₃)_0.67 emit white light whereas those made with TTFI_0.71 and TTF(SCN)_0.45 emit yellow light. Internal luminous efficiency of 1.41 mW^-1 has been obtained for ET(NO₃)_0.67-capped devices. The carrier injection was found to obey a space-charge-limited current model

Keywords

brightness; electrical contacts; electroluminescence; optical films; porous semiconductors; silicon; ET; Si; bis (ethylenedithio) tetrathiafulvalene; carrier injection; internal luminous efficiency; luminous efficiency; organic charge-transfer conductive adducts; organic conductive adduct; porous-silicon diodes; porous-silicon-based light-emitting devices; semitransparent conductive adduct coatings; space-charge-limited current model; tetrathiafulvalene; top electrical contacts; white light; white-colour electroluminescence; yellow light;

fLanguage

English

Journal_Title

Optoelectronics, IEE Proceedings -

Publisher

iet

ISSN

1350-2433

Type

jour

DOI

10.1049/ip-opt:20000566

Filename

881837