Suppression of external quantum efficiency roll-off of nanopatterned organic-light emitting diodes at high current densities

Hiroyuki Kuwae, Atsushi Nitta, Kou Yoshida, Takashi Kasahara, Toshinori Matsushima, Munetomo Inoue, Shuichi Shoji, Jun Mizuno, Chihaya Adachi

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

We developed organic light-emitting diodes (OLEDs) with nanopatterned current flow regions using electron-beam lithography with the aim of suppressing singlet-polaron annihilation (SPA). Nanopatterns composed of lines and circles were used in the current flow regions of nano-line and nano-dot OLEDs, respectively. Excitons partially escape from the current flow regions where SPA takes place. As such, current densities where external quantum efficiencies were half of their initial values (J0) increased as line width and circle diameter were decreased to close to the exciton diffusion length. Circles were more efficient at enhancing exciton escape and increasing J0 than lines. The J0 increase in the nano-dot OLEDs containing nanopatterned circles with a diameter of 50nm was approximately 41-fold that of a conventional OLED with a current flow region of 4mm2. The dependence of J0 on the size and shape of the nanopatterns was well explained by an SPA model that considered exciton diffusion. Nanopatterning of OLEDs is a feasible method of obtaining large J0.

本文言語英語
論文番号155501
ジャーナルJournal of Applied Physics
118
15
DOI
出版ステータス出版済み - 10 21 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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