Blade coating of Tris(8-hydroxyquinolinato)aluminum as the electron-transport layer for all-solution blue fluorescent organic light-emitting diodes

Yu Fan Chang, Hsin-Fei Meng*, Gang Lun Fan, Ken Tsung Wong, Hsiao-Wen Zan, Hao Wu Lin, Heh Lung Huang, Sheng Fu Horng

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Organic light-emitting diodes (OLEDs) with a low driving voltage and efficient blue fluorescence were fabricated through blade coating. Tris(8-hydroxyquinolinato)aluminum (Alq3) is a relatively stable electron-transporting material commonly used in evaporation. However, depositing Alq3 through a solution process is difficult because of its extremely low solubility organic solvents, a result of its symmetrical molecular structure. In this study, Alq3 was successfully deposited through blade coating at a very low concentration below 0.1wt%. The OLEDs contained co-dopants BUBD-1 and p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-Ph), and a high-band-gap host 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN) as the emission layer with the following structure: ITO/PEDOT:PSS (40 nm)/VB-FNPD (30 nm)/MADN:2% BUBD-1:1% DSA-Ph (50 nm)/TPBI (30 nm)/LiF (0.8 nm)/Al (100 nm)or ITO/PEDOT:PSS (40 nm)/VB-FNPD (30 nm)/MADN:3% BUBD-1 (50 nm)tris(8-hydroxyquinolinato)aluminum (Alq3; 10 nm)/LiF (0.8 nm)/Al (100 nm). 2,7-disubstituted fluorene-based triaryldiamine(VB-FNPD)is the cross-linking transporting material. The device exhibited a peak current efficiency of 5.67 cd/A for Alq3 and 5.76 cd/A for TPBI. The device with Alq3 has operated lifetime seven times higher than the device with TPBI.

Original languageEnglish
Pages (from-to)99-106
Number of pages8
JournalOrganic Electronics
Volume29
DOIs
StatePublished - 1 Feb 2016

Keywords

  • Organic light-emitting diodes
  • Solution-processed
  • Tris(8-hydroxyquinolinato)aluminum

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