High-Efficiency Organic Electrophosphorescent Diodes Using 1,3,5-Triazine Electron Transport Materials

Hiroko Inomata, Kenichi Goshi, Takuma Masuko, Tohru Konno, Toshiro Imai, Hiroyuki Sasabe, Julie J. Brown, Chihaya Adachi

Research output: Contribution to journalArticle

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Abstract

This paper reports on novel electron transport materials, 1,3,5-triazine derivatives (TRZ), which have been useful in high-efficiency electrophosphorescent (EP) organic light-emitting diodes (OLEDs). We synthesized four 2,4,6-tris(diarylamino)-1,3,5-triazine derivatives (TRZ1-TRZ4) that had electron-donating substituents and examined their OLED characteristics. Of these, we found that TRZ 2, 3, and 4 function as a host for tris(2-phenylpyridine)iridium (Ir(ppy) 3 ) and, in particular, 2,4,6-tris(carbazolo)-1,3,5-triazine (TRZ2) demonstrated a very high external electroluminescent (EL) quantum efficiency (η ext ) of ∼10.2 ± 1.0% and an energy conversion efficiency (η energy ) of 14.0 ± 2.0 lm/W. Detailed transient photoluminescent (PL) measurement revealed that the triplet energy level of TRZ2 (E T1 = 2.81 eV) is higher than that of conventional 4,4′-N,N′-dicarbazol-biphenyl (CBP) (E T1 = 2.56 eV), suggesting that TRZ2 has excellent capabilities in confining Ir(ppy) 3 triplet excitons.

Original languageEnglish
Pages (from-to)1285-1291
Number of pages7
JournalChemistry of Materials
Volume16
Issue number7
Publication statusPublished - Apr 6 2004
Externally publishedYes

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Triazines
Diodes
Organic light emitting diodes (OLED)
Derivatives
Iridium
Quantum efficiency
Energy conversion
Excitons
Electron energy levels
Conversion efficiency
Electrons
Electron Transport

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

High-Efficiency Organic Electrophosphorescent Diodes Using 1,3,5-Triazine Electron Transport Materials. / Inomata, Hiroko; Goshi, Kenichi; Masuko, Takuma; Konno, Tohru; Imai, Toshiro; Sasabe, Hiroyuki; Brown, Julie J.; Adachi, Chihaya.

In: Chemistry of Materials, Vol. 16, No. 7, 06.04.2004, p. 1285-1291.

Research output: Contribution to journalArticle

Inomata, H, Goshi, K, Masuko, T, Konno, T, Imai, T, Sasabe, H, Brown, JJ & Adachi, C 2004, 'High-Efficiency Organic Electrophosphorescent Diodes Using 1,3,5-Triazine Electron Transport Materials', Chemistry of Materials, vol. 16, no. 7, pp. 1285-1291.
Inomata, Hiroko ; Goshi, Kenichi ; Masuko, Takuma ; Konno, Tohru ; Imai, Toshiro ; Sasabe, Hiroyuki ; Brown, Julie J. ; Adachi, Chihaya. / High-Efficiency Organic Electrophosphorescent Diodes Using 1,3,5-Triazine Electron Transport Materials. In: Chemistry of Materials. 2004 ; Vol. 16, No. 7. pp. 1285-1291.
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