Highly polarized polymer light-emitting diodes utilizing friction-transferred poly(9,9-dioctylfluorene) thin films

Highly polarized polymer light-emitting diodes utilizing friction-transferred poly(9,9-dioctylfluorene) thin films

Polarized polymer light-emitting diodes (PLEDs) have been constructed utilizing friction-transferred poly(9,9-dioctylfluorene) (PFO) thin films. The friction transfer technique allows oriented PFO to be deposited directly onto an indium tin oxide anode without an alignment layer such as polyimide. P...

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Veröffentlicht in:Applied physics letters 2005-12, Vol.87 (24), p.243503-243503-3
Hauptverfasser: Misaki, Masahiro, Ueda, Yasukiyo, Nagamatsu, Shuichi, Chikamatsu, Masayuki, Yoshida, Yuji, Tanigaki, Nobutaka, Yase, Kiyoshi
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container_end_page 243503-3
container_issue 24
container_start_page 243503
container_title Applied physics letters
container_volume 87
creator Misaki, Masahiro
Ueda, Yasukiyo
Nagamatsu, Shuichi
Chikamatsu, Masayuki
Yoshida, Yuji
Tanigaki, Nobutaka
Yase, Kiyoshi
description Polarized polymer light-emitting diodes (PLEDs) have been constructed utilizing friction-transferred poly(9,9-dioctylfluorene) (PFO) thin films. The friction transfer technique allows oriented PFO to be deposited directly onto an indium tin oxide anode without an alignment layer such as polyimide. Polarized absorption and photoluminescence spectra revealed that the polymer backbones are highly aligned in the friction direction. We fabricated PLEDs consisting of friction-transferred PFO as an emissive layer, vacuum-deposited bathocuproine as an electron transport and hole-blocking layer, and a vacuum-deposited Li F ∕ Al cathode. Highly polarized blue emission with an integrated polarization ratio of 31 and a luminance of up to 300 cd ∕ m 2 was observed from the PLEDs.
doi_str_mv 10.1063/1.2142082
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title Highly polarized polymer light-emitting diodes utilizing friction-transferred poly(9,9-dioctylfluorene) thin films
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