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 journalArticle

16 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 (T 1 ) of T 1 = 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,C 2 ] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ PL = 88±2 % and Φ PL =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 (η EL ) 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 - Sep 10 2007

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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