Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material

Soo Son Kyung, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5- pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T1) of T1= 2.93 eV (PYD2) and T 1= 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C2] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of ΦPL= 88±2 % and ΦPL=80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (ηEL) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.

Original languageEnglish
Pages (from-to)47-51
Number of pages5
JournalJournal of Photopolymer Science and Technology
Volume20
Issue number1
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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