Injection and transport of high current density over 1000 A/cm2 in organic light emitting diodes under pulse excitation

Hajime Nakanotani, Takahito Oyamada, Yuichiro Kawamura, Hiroyuki Sasabe, Chihaya Adachi

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40 Citations (Scopus)

Abstract

We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm2 in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148Wm-1 K-1) and a small cathode configuration (cathode radius r = 50 μm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency (ηext) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.

Original languageEnglish
Pages (from-to)3659-3662
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number6 A
DOIs
Publication statusPublished - Jun 1 2005

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Organic light emitting diodes (OLED)
high current
Current density
light emitting diodes
injection
current density
Cathodes
pulses
excitation
cathodes
Quantum efficiency
Excitons
Thermal conductivity
quantum efficiency
Silicon
thermal conductivity
direct current
excitons
Electric potential
Substrates

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm2 in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148Wm-1 K-1) and a small cathode configuration (cathode radius r = 50 μm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency (ηext) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.",
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T1 - Injection and transport of high current density over 1000 A/cm2 in organic light emitting diodes under pulse excitation

AU - Nakanotani, Hajime

AU - Oyamada, Takahito

AU - Kawamura, Yuichiro

AU - Sasabe, Hiroyuki

AU - Adachi, Chihaya

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N2 - We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm2 in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148Wm-1 K-1) and a small cathode configuration (cathode radius r = 50 μm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency (ηext) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.

AB - We succeeded in injecting and transporting a maximum high current density of J = 1163 A/cm2 in organic light-emitting diodes using short-pulse excitation combined with a highly thermally conductive silicon substrate (thermal conductivity: 148Wm-1 K-1) and a small cathode configuration (cathode radius r = 50 μm). A maximum current density almost 20 times higher than that associated with direct current (DC) operation was observed by driving an OLED with a short pulse voltage. With short-pulse excitation, the decrease in external quantum efficiency (ηext) obeyed a typical singlet-singlet exciton annihilation model well, indicating that the generation of Joule heat in OLEDs can be suppressed under pulse operation.

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