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

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


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
Issue number6 A
Publication statusPublished - Jun 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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