Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents

Bong Soo Kim, Sung Hoon Joo, Dongkeun Oh, Soon Wook Cha, Don Soo Choi, Cheol Eui Lee, Jung Il Jin

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Two new blue-light emitters, 3,6-bis(4-carbazolylstyryl)-N-4- methylphenylcarbazole (Cz 3) and 3,6-bis[4-(3,6-dicyanocarbazolyl) styryl]-N-4-methylphenylcarbazole (Cz 3(CN) 4), were found to form high glass-transition temperature (T g), amorphous organic glasses, when vacuum deposited. Cz 3(CN) 4 exhibited a much higher T g value (242°C) than Cz 3 (163°C). It was found that Cz 3 is an excellent hole transporter (μ h + = 1.3 × 10 -4cm 2/Vs, μ e - = 2.8 × 10 -8cm 2/Vs) while Cz 3(CN) 4 shows a faster electron mobility (μ e - = 3.1 × 10 -6cm 2/Vs) than hole mobility (μ h + = 2.0 × 10 -8cm 2/Vs), which is perceived to tell us that the presence of the electron-attracting nitrile (C≡N) groups facilitates the electron mobility. The single layer electroluminescence (EL) device (ITO/EML/Li:Al) of Cz 3(CN) 4 performed much better (external quantum efficiency ∼3.0 × 10 -2%) than that of Cz 3 (external quantum efficiency ∼1.2 × 10 -3%).

Original languageEnglish
Pages (from-to)229-235
Number of pages7
JournalSynthetic Metals
Volume145
Issue number2-3
DOIs
Publication statusPublished - 2004 Sep 21

Fingerprint

Nitriles
carbazoles
Electron mobility
nitriles
trimers
Quantum efficiency
electron mobility
Luminescence
quantum efficiency
luminescence
transporter
Hole mobility
hole mobility
Electroluminescence
ITO (semiconductors)
electroluminescence
glass transition temperature
emitters
Vacuum
Glass

Keywords

  • Electroluminescence
  • Light sources
  • Organic semiconductor based on molecules

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents. / Kim, Bong Soo; Joo, Sung Hoon; Oh, Dongkeun; Cha, Soon Wook; Choi, Don Soo; Lee, Cheol Eui; Jin, Jung Il.

In: Synthetic Metals, Vol. 145, No. 2-3, 21.09.2004, p. 229-235.

Research output: Contribution to journalArticle

Kim, Bong Soo ; Joo, Sung Hoon ; Oh, Dongkeun ; Cha, Soon Wook ; Choi, Don Soo ; Lee, Cheol Eui ; Jin, Jung Il. / Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents. In: Synthetic Metals. 2004 ; Vol. 145, No. 2-3. pp. 229-235.
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