Spectrally Narrow Emission at Cutoff Wavelength from Edge of Electrically Pumped Organic Light-Emitting Diodes

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概要

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• 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.

• 2007-09-25

著者

• Adachi Chihaya

  Crest Program Japan Science And Technology Agency (jst)

• Moriwake Masato

  Research and Development Center, Rohm Co., 21 Mizosaki, Nishi-in, Ukyo, Kyoto 615-8585, Japan

• Yahiro Masayuki

  CREST Program, Japan Science and Technology Agency (JST), 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan

• Ohnishi Dai

  Research and Development Center, Rohm Co., 21 Mizosaki, Nishi-in, Ukyo, Kyoto 615-8585, Japan

• Yokoyama Daisuke

  CREST Program, Japan Science and Technology Agency (JST), 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan

• Nakanotani Hajime

  CREST Program, Japan Science and Technology Agency (JST), 1-32-12 Higashi, Shibuya, Tokyo 150-0011, Japan

• Setoguchi Yousuke

  Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan

関連論文

• Carrier Injection and Transport of Steady-State High Current Density Exceeding 1000A/cm^2 in Organic Thin Films
• Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films
• Spectrally Narrow Emission at Cutoff Wavelength from Edge of Electrically Pumped Organic Light-Emitting Diodes
• Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films
• Erratum: "Simple Accurate System for Measuring Absolute Photoluminescence Quantum Efficiency in Organic Solid-State Thin Films"

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