Device properties and degradation mechanisms of organic light-emitting diodes composed of organic layers with orientation polarization

• Project/Area Number: 22750167
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Functional materials/Devices
• Research Institution: Chiba University
• Principal Investigator: NOGUCHI Yutaka 千葉大学, 先進科学センター, 助教 (20399538)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2010: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 有機EL素子 / 配向分極 / 永久双極子 / 電荷蓄積 / 劣化機構 / 界面電荷 / 変位電流法

Research Abstract

Findings of this study are as follows : 1) Several polar molecules that are commonly used in organic semiconductor devices spontaneously forms orientation polarization in their evaporated films. 2) The origin of interface charge at organic hetero interfaces is polarization charge originating from the orientation polarization. 3) Presence of polar molecules in the vicinity of organic hetero interface suppresses charge dispersion. 4) Light irradiation during the film formation of a polar molecule changes the charge accumulation property in the resultant devices, and causes a shorter lifetime. These findings indicate that permanent dipole moment is an important parameter that strongly affects on the device properties of organic semiconductor devices.

Research Products

• [Journal Article] Light- and ion-gauge-induced space charges in tris-(8-hydroxyquinolate) aluminum-based organic light-emitting diodes (2010)
  • Author(s): Yutaka Noguchi, Naoki Sato, Yukimasa Miyazaki, Hisao Ishii
  • Journal Title: Applied Physics Letter Volume: Vol.96
• [Journal Article] Light- and ion-gauge-induced space charges in tris-(8-hydroxyquinolate) alminum-based organic light-emitting diodes (2010)
  • Author(s): Yutaka Noguchi, Naoki Sato, Yukimasa Miyazaki, Hisao Ishii
  • Journal Title: Applied Physics Letters Volume: 96 Pages: 1433051-3
  • Peer Reviewed
• [Journal Article] Charge accumulation at organic semiconductor interfaces due to a permanent dipole moment and its orientational order in bilayer devices
  • Author(s): Yutaka Noguchi, Yukimasa Miyazaki, Yuya Tanaka, Naoki Sato, Yasuo Nakayama, Tobias D. Schmidt, Wolfgang Bruetting, Hisao Ishii
  • Journal Title: Journal of Applied Physics in press
• [Presentation] Carrier Blocking Nature in Organic Light Emitting Diode Studied by Displacement Current Measurement and Time-Of-Flight Method (2011)
  • Author(s): Md.Mijanur Rahman, Naoki Ogawa, Yukimasa Miyazaki, Yasuo Nakayama, Yutaka Noguchi, Hisao Ishii
  • Organizer: The 6th International Symposium on Surface Scienece and Nanotechnology (ISSS-6)
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2011-12-11
• [Presentation] 分子の永久双極子に起因する有機/有機界面の電荷蓄積現象 (2011)
  • Author(s): 野口裕
  • Organizer: 日本学術振興会情報科学用有機材料第142委員会合同研究会(招待講演)
  • Place of Presentation: 東京理科大学森戸記念館
  • Year and Date: 2011-10-28
• [Presentation] 分子の永久双極子に起因する有機/有機界面の電荷蓄積現象 (2011)
  • Author(s): 野口裕
  • Organizer: 日本学術振興会 情報科学用有機材料第142委員会 A部会 第121回、B部会 第113回、C部会 第48回 合同研究会
  • Place of Presentation: 東京理科大学森戸記念館(招待講演)
  • Year and Date: 2011-10-28
• [Presentation] ケルビン法による有機太陽電池の内部電界分布評価-バンドの曲がりと巨大表面電位形成- (2011)
  • Author(s): 田中有弥, 野口裕, 安川圭一, 東海林弘, 石井久夫
  • Organizer: 第72回 応用物理学会学術講演会
  • Place of Presentation: 山形大学
  • Year and Date: 2011-09-02
• [Presentation] 分子の永久双極子に起因する有機/有機界面の電荷蓄積現象 (2011)
  • Author(s): 野口裕, 宮崎行正, 田中有弥, Wolfgang Bruetting, 石井久夫
  • Organizer: 第72回 応用物理学会学術講演会
  • Place of Presentation: 山形大学
  • Year and Date: 2011-08-30
• [Presentation] Alq3を用いた有機EL素子の界面電荷と劣化挙動 (2011)
  • Author(s): 田村駿光, 野口裕, 石井久夫
  • Organizer: 第12回有機EL討論会
  • Place of Presentation: 日本科学未来館みらいCANホール
  • Year and Date: 2011-07-01
• [Presentation] 分子のダイポールモーメントと有機ヘテロ界面の電荷蓄積 (2011)
  • Author(s): 野口裕, 宮崎行正, 田中有弥, Wolfgang Bruetting, 石井久夫
  • Organizer: 第12回有機EL討論会
  • Place of Presentation: 日本科学未来館みらいCANホール(講演奨励賞受賞)
  • Year and Date: 2011-06-30
• [Presentation] 分子のダイポールモーメントと有機ヘテロ界面の電荷蓄積 (2011)
  • Author(s): 野口裕, 宮崎行正, 田中有弥, Wolfgang Bruetting, 石井久夫
  • Organizer: 第12回有機EL討論会
  • Place of Presentation: 日本科学未来館みらいCANホール
  • Year and Date: 2011-06-30
• [Presentation] Charge accumulation mechanisms at organic hetero interfaces : effects of interface charges and orientation polarization (2010)
  • Author(s): Yukimasa Miyazaki, Yutaka Noguchi, Yasuo Nakayama, Wolfgang Bruetting, Hisao Ishii
  • Organizer: 9^<th> International conference on nano-molecular electronics (ICNME2010)
  • Place of Presentation: International Conference center (Kobe)
  • Year and Date: 2010-12-15
• [Presentation] COE Start-up International Workshop (2010)
  • Author(s): Yutaka Noguchi
  • Organizer: Organic Semiconductors Towards the Next
  • Place of Presentation: Chiba University (Chiba)
  • Year and Date: 2010-11-11
• [Presentation] Interface charges and orientation polarization in organic light-emitting diodes (2010)
  • Author(s): Yutaka Noguchi
  • Organizer: COE Start-up International Workshop "Organic Semiconductors Towards the Next"
  • Place of Presentation: Chiba University (Chiba)
  • Year and Date: 2010-11-11
• [Presentation] Charge accumlation mechanisms at organic hetero interfaces : Interface charge and orientation polarization [invited] (2010)
  • Author(s): Yutaka Noguchi, Yukimasa Miyazaki, Yasuo Nakayama, Wolfgang Bruetting, Hisao Ishii
  • Organizer: The 10th International Discussion & Conference on Nano Interface Controlled Electronic Devices 2010 (IDC-NICE 2010)
  • Place of Presentation: Haevichi hotel (Jeju, Korea)
  • Year and Date: 2010-10-28
• [Presentation] Charge accumlation mechanisms at organic hetero interfaces : Interface charge and orientation polarization (2010)
  • Author(s): Yutaka Noguchi, Yukimasa Miyazaki, Yasuo Nakayama, Wolfgang Bruetting, Hisao Ishii
  • Organizer: The 10th International Discussion & Conference on Nano Interface Controlled Electronic Devices 2010 (IDC-NICE 2010)
  • Place of Presentation: Haevichi hotel (Jeju, Korea)(invited)
  • Year and Date: 2010-10-28
• [Presentation] 極性分子膜を含む有機ヘテロ界面における電荷蓄積機構 (2010)
  • Author(s): 宮崎行正、中山泰生、野口裕、Wolfgang Bruetting、石井久夫
  • Organizer: 有機EL討論会第10回例会
  • Place of Presentation: 日本科学未来館(東京)
  • Year and Date: 2010-06-18
• [Remarks]
  • URL: http://ishii-lab.cfs.chiba-u.ac.jp/pukiwiki/index.php?%B3%D8%B2%F1%C8%AF%C9%BD
• [Remarks]
  • URL: http://ishii-lab.cfs.chiba-u.ac.jp/pukiwiki/index.php?%B3%D8%B2%F1%C8%AF%C9%BD
• [Remarks]
  • URL: http://www.gcoe.tf.chiba-u.jp/jp/members/detail.php?id_i=16&year=2010