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: Article

14 引用 (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.

元の言語English
記事番号155501
ジャーナルJournal of Applied Physics
118
発行部数15
DOI
出版物ステータスPublished - 2015 10 21

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high current
quantum efficiency
light emitting diodes
retarding
current density
excitons
escape
diffusion length
lithography
electron beams

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

Suppression of external quantum efficiency roll-off of nanopatterned organic-light emitting diodes at high current densities. / Kuwae, Hiroyuki; Nitta, Atsushi; Yoshida, Kou; Kasahara, Takashi; Matsushima, Toshinori; Inoue, Munetomo; Shoji, Shuichi; Mizuno, Jun; Adachi, Chihaya.

:: Journal of Applied Physics, 巻 118, 番号 15, 155501, 21.10.2015.

研究成果: Article

Kuwae, Hiroyuki ; Nitta, Atsushi ; Yoshida, Kou ; Kasahara, Takashi ; Matsushima, Toshinori ; Inoue, Munetomo ; Shoji, Shuichi ; Mizuno, Jun ; Adachi, Chihaya. / Suppression of external quantum efficiency roll-off of nanopatterned organic-light emitting diodes at high current densities. :: Journal of Applied Physics. 2015 ; 巻 118, 番号 15.
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abstract = "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.",
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AU - Nitta, Atsushi

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AU - Kasahara, Takashi

AU - Matsushima, Toshinori

AU - Inoue, Munetomo

AU - Shoji, Shuichi

AU - Mizuno, Jun

AU - Adachi, Chihaya

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