Photoluminescence and electroluminescence of carbazole-based conjugated dendritic molecules

Min Ju Cho, Young Min Kim, Byeong Kwon Ju, Dong Hoon Choi

Research output: Contribution to journalArticle

Abstract

A novel class of conjugated dendritic molecules bearing N-hexyl-substituted carbazoles as peripheral groups and various conjugative aromatic cores was synthesized through Heck coupling and the Horner-Emmons reaction. A multilayered structure of ITO/PEDOT:PSS (30 nm)/emitting material (50 nm)/BCP (10 nm)/Alq3 (10 nm)/LiF (1 nm)/Al (100 nm) was employed to evaluate the synthesized dendritic materials. The electroluminescence spectrum of the multilayered device made of 3Cz predominantly exhibited blue emissions. Similar emissions were observed in the PL spectra of it's the device's thin film. The multilayered devices made of 3Cz, 3BCz, and 4BCz showed luminance values of 6,250 cd m–2 at 24 V, 3,000 cd m–2 at 25 V, and 1,970 cd m–2 at 36 V, respectively. The smallest molecule, 3Cz, which bore three carbazole peripheral groups, exhibited a blue-like emission with CIE 1931 chromaticity coordinates of x = 0.17 and y = 0.21.

Original languageEnglish
Pages (from-to)16-22
Number of pages7
JournalJournal of Information Display
Volume9
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • Absorption
  • Blue emission
  • Dendritic molecule
  • Electroluminescence
  • Photoluminescence

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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