Binaphthalene bridged bipolar transporting materials for blue electroluminescence: Toward high EL efficiency via molecular tuning

Rossatorn Muangpaisal, Wei I. Hung, Jiann T. Lin*, San Yu Ting, Li Yin Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Two isomeric bipolar transporting molecules containing arylamine and benzimidazole moieties linked by 1,1-binaphthalene bridge have been synthesized and used for blue light-emitting diodes. The highly twisted binaphthalene bridge is beneficial for amorphous morphology, good solubility, high thermal stability and high photoluminescence quantum efficiency (ΦPL). The charge transfer bands of these compounds exhibit interesting solvent-polarity dependent fluorescence properties. The physical properties of the compounds were tunable upon binding of the benzimidazole with binaphthalene group via C- (BINAPC) or N- (BINAPN) linkage. Three-layered blue-emitting OLEDs using BINAPC or BINAPN as the emitting layer, NPB as the hole transporting layer, and TPBI as the electron transporting layer as well as hole-blocking layer exhibit good performance. External quantum efficiencies of 2.49% with color coordinates of (0.15, 0.11) and 2.67% with color coordinates of (0.16, 0.16) were achieved for BINAPC and BINAPN, respectively.

Original languageEnglish
Pages (from-to)2992-2998
Number of pages7
JournalTetrahedron
Volume70
Issue number18
DOIs
StatePublished - 6 May 2014

Keywords

  • Amorphous materials
  • Bipolar transport
  • Blue light-emitting
  • Organic light emitting diode
  • Structure-properties correlations

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