Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes

Daisuke Yokoyama, Hajime Nakanotam, Yousuke Setoguchi, Masato Moriwake, Dai Ohnishi, Masayuki Yahiro, Chihaya Adachi

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We demonstrate spectrally narrow emissions from the edge of electrically pumped organic light-emitting diodes having a fine "line-shaped" waveguide structure with a silver cathode. A 4,4′-bis[(N-carbazole)styryl] -biphenyl (BSB-Cz) layer, which has a very low amplified spontaneous emission threshold, was used as an emitting layer. We observed extremely narrow emissions having polarized transverse electric (TE) mode. The full width at half maximum became narrower down to 6.5 nm as the peak wavelength of the emission approached the wavelength of the 0-1 transition of the BSB-Cz layer. The edge emission intensity showed a superlinear relationship with the current density, and the spectral shapes changed appreciably depending on the current density, indicating the occurrence of amplification of the emitted light. The peak wavelengths of the edge emissions were attributed to the leaky mode very close to the cutoff wavelength of the waveguide structure having the metal cladding layer.

Original languageEnglish
Pages (from-to)L826-L829
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume46
Issue number33-35
DOIs
Publication statusPublished - Sep 7 2007

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light emitting diodes
cut-off
wavelengths
current density
waveguides
carbazoles
spontaneous emission
cathodes
silver
occurrences
thresholds
metals

All Science Journal Classification (ASJC) codes

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

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Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes. / Yokoyama, Daisuke; Nakanotam, Hajime; Setoguchi, Yousuke; Moriwake, Masato; Ohnishi, Dai; Yahiro, Masayuki; Adachi, Chihaya.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 46, No. 33-35, 07.09.2007, p. L826-L829.

Research output: Contribution to journalArticle

Yokoyama, Daisuke ; Nakanotam, Hajime ; Setoguchi, Yousuke ; Moriwake, Masato ; Ohnishi, Dai ; Yahiro, Masayuki ; Adachi, Chihaya. / Spectrally narrow emission at cutoff wavelength from edge of electrically pumped organic light-emitting diodes. In: Japanese Journal of Applied Physics, Part 2: Letters. 2007 ; Vol. 46, No. 33-35. pp. L826-L829.
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AU - Ohnishi, Dai

AU - Yahiro, Masayuki

AU - Adachi, Chihaya

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