Very low amplified spontaneous emission threshold and electroluminescence characteristics of 1,1′-diphenyl substituted fluorene derivatives

Hajime Nakanotani, Naoki Matsumoto, Hiroyuki Uchiuzou, Masakazu Nishiyama, Masayuki Yahiro, Chihaya Adachi

Research output: Contribution to journalArticle

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Abstract

A blue amplified spontaneous emission with a very low threshold was observed in novel fluorene derivatives doped into a 4,4′-bis-(N-carbazole)-biphenyl (CBP) host. With 6 wt%-2,7-bis[4′-(N,N-diphenylamino)-1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9H-fluorene (BDF2) or 2,7-bis[1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9-H-fluorene (BBF) as a dopant, high photoluminescence quantum efficiencies of 90% ± 1% and 78% ± 2% with extremely low amplified spontaneous emission thresholds of 0.15 ± 0.05 μJ/cm2 (300 W/cm2) and 0.17 ± 0.04 μJ/cm2 (340 W/cm2) were obtained. We also observed a high gain coefficient (38 cm-1) and a low loss coefficient (6 cm-1) in a 6 wt%-BDF2:CBP thin film optical-waveguide. Furthermore, an organic light emitting diode with BDF2 as an emitter demonstrated a high external quantum efficiency (ηext) of 4.5% ± 0.1%. In addition, electroluminescence from an organic field-effect transistor with BDF2 as an active material was also observed with a maximum ηext of 0.02%.

Original languageEnglish
Pages (from-to)630-636
Number of pages7
JournalOptical Materials
Volume30
Issue number4
DOIs
Publication statusPublished - Jan 1 2007

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carbazoles
Spontaneous emission
Electroluminescence
Quantum efficiency
electroluminescence
spontaneous emission
quantum efficiency
Derivatives
Organic field effect transistors
thresholds
Organic light emitting diodes (OLED)
Optical waveguides
coefficients
high gain
optical waveguides
Photoluminescence
emitters
light emitting diodes
field effect transistors
Doping (additives)

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

Cite this

Very low amplified spontaneous emission threshold and electroluminescence characteristics of 1,1′-diphenyl substituted fluorene derivatives. / Nakanotani, Hajime; Matsumoto, Naoki; Uchiuzou, Hiroyuki; Nishiyama, Masakazu; Yahiro, Masayuki; Adachi, Chihaya.

In: Optical Materials, Vol. 30, No. 4, 01.01.2007, p. 630-636.

Research output: Contribution to journalArticle

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abstract = "A blue amplified spontaneous emission with a very low threshold was observed in novel fluorene derivatives doped into a 4,4′-bis-(N-carbazole)-biphenyl (CBP) host. With 6 wt{\%}-2,7-bis[4′-(N,N-diphenylamino)-1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9H-fluorene (BDF2) or 2,7-bis[1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9-H-fluorene (BBF) as a dopant, high photoluminescence quantum efficiencies of 90{\%} ± 1{\%} and 78{\%} ± 2{\%} with extremely low amplified spontaneous emission thresholds of 0.15 ± 0.05 μJ/cm2 (300 W/cm2) and 0.17 ± 0.04 μJ/cm2 (340 W/cm2) were obtained. We also observed a high gain coefficient (38 cm-1) and a low loss coefficient (6 cm-1) in a 6 wt{\%}-BDF2:CBP thin film optical-waveguide. Furthermore, an organic light emitting diode with BDF2 as an emitter demonstrated a high external quantum efficiency (ηext) of 4.5{\%} ± 0.1{\%}. In addition, electroluminescence from an organic field-effect transistor with BDF2 as an active material was also observed with a maximum ηext of 0.02{\%}.",
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AB - A blue amplified spontaneous emission with a very low threshold was observed in novel fluorene derivatives doped into a 4,4′-bis-(N-carbazole)-biphenyl (CBP) host. With 6 wt%-2,7-bis[4′-(N,N-diphenylamino)-1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9H-fluorene (BDF2) or 2,7-bis[1,1′-biphenyl-4-yl]-9,9-bis(1,1′-biphenyl-4-yl)-9-H-fluorene (BBF) as a dopant, high photoluminescence quantum efficiencies of 90% ± 1% and 78% ± 2% with extremely low amplified spontaneous emission thresholds of 0.15 ± 0.05 μJ/cm2 (300 W/cm2) and 0.17 ± 0.04 μJ/cm2 (340 W/cm2) were obtained. We also observed a high gain coefficient (38 cm-1) and a low loss coefficient (6 cm-1) in a 6 wt%-BDF2:CBP thin film optical-waveguide. Furthermore, an organic light emitting diode with BDF2 as an emitter demonstrated a high external quantum efficiency (ηext) of 4.5% ± 0.1%. In addition, electroluminescence from an organic field-effect transistor with BDF2 as an active material was also observed with a maximum ηext of 0.02%.

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