Research on emissive materials for white organic light emitting diodes

2009 Fiscal Year Final Research Report

• Project/Area Number: 19560018
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Kyoto Sangyo University
• Principal Investigator: TSUBOI Taiju Kyoto Sangyo University, コンピュータ理工学部, 教授 (70065861)
• Co-Investigator(Kenkyū-buntansha): TANIKAWA Masayuki 京都産業大学, 理学部, 教授 (80207175)
• Project Period (FY): 2007 – 2009
• Keywords: 有機EL / 多波長発光分子 / 白色有機EL素子 / 有機EL照明 / 有機ELテレビ

Research Abstract

We studied organic materials which give white light emission in organic light emitting diodes with a single dopant emitter. We obtained dual emission from mixed-ligand iridium complex, dual emission of fluorescence and phosphorescence from fluorescent materials by phosphor-sensitization, dual emission from thin film of blue emitting host lightly doped with red emitter, and very broad white emission from four exciplexes which are formed in two layers with four fluorescent molecules.

Research Products

• [Journal Article] Photoluminescence characteristics of green and blue emitting Alq3 organic molecules in crystals and thin films (2010)
  • Author(s): T. Tsuboi, Y. Torii
  • Journal Title: Journal of Non-Crystalline Solids (印刷中)
  • Peer Reviewed
• [Journal Article] Recent advances in white organic light emitting diodes with a single emissive dopant (2010)
  • Author(s): T. Tsuboi
  • Journal Title: Journal of Non-Crystalline Solids (印刷中)
  • Peer Reviewed
• [Journal Article] Selective Synthesis of Facial and Meridianal Isomers of Alq3 (2010)
  • Author(s): T. Tsuboi, Y. Torii
  • Journal Title: Molecular Crystals and Liquid Crystals (印刷中)
  • Peer Reviewed
• [Journal Article] Fluorescence and phosphorescence behavior of TPD doped and TPD neat films (2009)
  • Author(s): T. Tsuboi, A.K. Bansal, A. Penzkofer
  • Journal Title: Thin Solid Films Vol.518,No.2 Pages: 835-838
  • Peer Reviewed
• [Journal Article] Spectroscopic and electrical characteristics of highly efficient tetraphenylsilane-carbazole organic compound as host material for blue organic light emitting diodes (2009)
  • Author(s): T. Tsuboi, S.W. Liu, M.F. Wu, C. Ti Chen
  • Journal Title: Organic Electronics Vol.10,No.7 Pages: 1372-1377
  • Peer Reviewed
• [Journal Article] Very broad white emission spectrum based organic light-emitting diodes by four exciplex emission bands (2009)
  • Author(s): J.Z. Zhu, W.L. Li, L.L. Han, B. Chu, G. Zhang, D.F. Yang, Y.R. Chen, Z.S. Su, J.B. Wang, S.H. Wu, T. Tsuboi
  • Journal Title: Optics Letters Vol.34,No.19 Pages: 2946-2948
  • Peer Reviewed
• [Journal Article] Observation of phosphorescence from fluorescent organic material Bebq2 using phosphorescent sensitizer (2009)
  • Author(s): T. Tsuboi, W.S. Jeon, J.H. Kwon
  • Journal Title: Optical Materials Vol.31,No.12 Pages: 1755-1758
  • Peer Reviewed
• [Journal Article] Temperature Dependence of Fluorescence and Phosphorescence of the Triphenylamine Dimer 3-methyl-TPD (2009)
  • Author(s): T. Tsuboi, A.K. Bansal, A. Penzkofer
  • Journal Title: Optical Materials Vol.31,No.6 Pages: 980-988
  • Peer Reviewed
• [Journal Article] Photoluminescence Characteristics of Blue Phosphorescent Ir3+-Compounds FIrpic and FIrN4 Doped in mCP and SimCP (2008)
  • Author(s): T. Tsuboi, H. Murayama, S.-J. Yeh, M.-F. Wu, C.-Ti Chen
  • Journal Title: Optical Materials Vol.31,No.2 Pages: 366-371
  • Peer Reviewed
• [Journal Article] Energy transfer between Ir(ppy)3 molecules in neat film and concentration quenching of phosphorescence (2008)
  • Author(s): T. Tsuboi, N. Aljaroudi
  • Journal Title: Optical Materials Vol.30,No.9 Pages: 1375-1381
  • Peer Reviewed
• [Journal Article] The preparation of (8-hydroxyquinolinato) bis(2-phenylpyridyl)-iridium complexes and their photophysical properties (2008)
  • Author(s): D.F. Huang, S.S. Sun, C.Y. Wu, T.J. Chow, S. Polosan, T. Tsuboi
  • Journal Title: Journal of the Chinese Chemical Society Vol.55,No.2 Pages: 439-448
  • Peer Reviewed
• [Journal Article] Density functional theory analysis of a mixed-ligand iridium compound for multi-color organic light emitting diodes (2008)
  • Author(s): S. Polosan, T.J. Chow, T. Tsuboi
  • Journal Title: Journal of Physical Organic Chemistry Vol.21,No.4 Pages: 315-32
  • Peer Reviewed
• [Journal Article] Optical characteristics of organic light emitting diode with IrQ(ppy)2-5Cl and its emitter (2008)
  • Author(s): T. Tsuboi, S. Polosan, D.F. Huang, T.J. Chow
  • Journal Title: Thin Solid Films Vol.516,No.9 Pages: 2788-2793
  • Peer Reviewed
• [Journal Article] Highly efficient and luminant green organic light-emitting diodes from single exciplex emission (2008)
  • Author(s): D. Wang, W.L. Li, B. Chu, Z.S. Su, D.F. Bi, D.Y. Zhang, J.Z. Zhu, F. Yang, Y.R. Chen, T. Tsuboi
  • Journal Title: Applied Physics Letters Vol.92,No.5 Pages: 053304-1-3
  • Peer Reviewed
• [Journal Article] Electronic relaxation processes in the T1 state of phosphorescent fac-tris(2-phenylpyridine) iridium molecule in 4, 4'-N, N'-dicarbazole-biphenyl host (2008)
  • Author(s): T. Tsuboi, N. Aljaroudi
  • Journal Title: Japanese Journal of Applied Physics Vol.47,No.2B Pages: 1266-1270
  • Peer Reviewed
• [Journal Article] Lighting object-based non-doped-type white organic light emitting diode by using N, N'-diphenyl-N, N'-bis(1-naphthyl)-(1, 1'-benzidine)-4, 4'-diamine as the chromaticity-tuning layer (2007)
  • Author(s): J.Z. Zhu, W.L. Li, B. Chu, B. Li, Z.Z. Hu, Z.Q. Zhang, T. Tsuboi
  • Journal Title: Optics Letters Vol.32,No.24 Pages: 3537-3539
  • Peer Reviewed
• [Journal Article] Sensitized electrophosphorescence of infrared emission diode based on copper phthalocyanine by an ytterbium complex (2007)
  • Author(s): F. Yan, W.L. Li, B. Chu, T.L. Li, J.Z. Zhu, D.F. Bi, L.L. Han, C.H. Cheng, G.T. Du, T. Tsuboi
  • Journal Title: Applied Physics Letters Vol.91,No.20 Pages: 203512-1-3
  • Peer Reviewed
• [Journal Article] Low efficiency roll-off at high current densities in Ir-complex based electrophosphorescence diode with exciton diffusing and fluorescence compensating layers (2007)
  • Author(s): D.Y. Zhang, W.L. Li, L.L. Han, D.F. Bi, X. Li, D.F. Yang, F. Yan, H.H. Liu, D. Wang, T. Tsuboi
  • Journal Title: Applied Physics Letters Vol.91,No.18 Pages: 183516-1-3
  • Peer Reviewed
• [Journal Article] Photophysics and electroluminescence of organometallic compounds with d-electrons (2007)
  • Author(s): T. Tsuboi, N. Aljaroudi
  • Journal Title: Journal of Alloys and Compounds Vol.442,No.1-2 Pages: 55-60
  • Peer Reviewed
• [Journal Article] The quest of high-performance host materials for electrophosphorescence blue dopants (2007)
  • Author(s): T. Tsuboi, W.S. Li, I. Chao, S.W. Liu, J.K. Wang
  • Journal Title: Advanced Functional Materials 17 No.12 Pages: 1887-1895
  • Peer Reviewed
• [Presentation] Conditions for enhancement of phosphorescence intensity in organic fluorescent materials (2009)
  • Author(s): T. Tsuboi
  • Organizer: 第6回中国有機分子高分子発光学術会議
  • Place of Presentation: 中国
  • Year and Date: 20090000
• [Presentation] White Organic Light Emitting Diodes for Super-Thin Flat Panel Lighting (2009)
  • Author(s): T. Tsuboi
  • Organizer: The 6th International Workshop on Functional and Nanonstructured Materials (FNMA09)
  • Place of Presentation: スルモナ会議場(イタリア)
  • Year and Date: 20090000
• [Presentation] Selective Synthesis of Facial and Meridianal Isomers of Alq3 (2009)
  • Author(s): Y. Torii, T. Tsuboi
  • Organizer: The13th Japan-Korea International Symposium on Advanced Display Materials and Devices (ADMD 2009)
  • Place of Presentation: 広島大学
  • Year and Date: 20090000
• [Presentation] New Host Material for Highly Efficient Blue Organic Light Emitting Diodes (2009)
  • Author(s): T. Tsuboi, M.F. Wu, S.W. Liu, C. Ti Chen
  • Organizer: The13th Japan-Korea International Symposium on Advanced Display Materials and Devices (ADMD 2009)
  • Place of Presentation: 広島大学
  • Year and Date: 20090000
• [Presentation] Fluorescence and Phosphorescence Quantum Yields of Blue Fluorescent TPD (2008)
  • Author(s): T. Tsuboi, A.K. Bansal, A. Penzkofer
  • Organizer: The 8th International Conference on Nano-Molecular Electronics (ICNME 2008)
  • Place of Presentation: 神戸ポートピアホテル
  • Year and Date: 20080000
• [Presentation] Spectroscopic characteristics of organic ultra-violet emitting tetraphenylsilanecarbazole compound with high glass transition temperature, morphological stability and carrier mobility (2008)
  • Author(s): T. Tsuboi, M.F. Wu, S.W. Liu, C. Ti Chen
  • Organizer: The 8th International Conference on Nano-Molecular Electronics (ICNME 2008)
  • Place of Presentation: 神戸ポートピアホテル
  • Year and Date: 20080000
• [Presentation] Enhancement of Phosphorescence from Organic Fluorescent Materials by Sensitization (2008)
  • Author(s): T. Tsuboi
  • Organizer: The 8th International Meeting on Information Display, International Display Manufacturing Conference and Asia Display (IMID/IDMC/ASIA DISPLAY 2008)
  • Place of Presentation: 韓国国際展示場(韓国)
  • Year and Date: 20080000
• [Presentation] Observation of phosphorescence from fluorescent organic materials using phosphorescent sensitizer (2008)
  • Author(s): T. Tsuboi
  • Organizer: International Workshop on Advanced Spectroscopy and Optical Materials (IWASOM08)
  • Place of Presentation: グダンスク大学(ポーランド)
  • Year and Date: 20080000
• [Presentation] Photophysics and electroluminescence of phosphorescent organometallic compounds used for organic light emitting diodes (2007)
  • Author(s): T. Tsuboi
  • Organizer: The 11th Conference on Luminescence of China (CLC2007)
  • Place of Presentation: 長春北東師範大学(中国)
  • Year and Date: 20070000
• [Presentation] Relaxation Processes in the T1 state of Phosphorescent Organometallic Ir-com- pounds (2007)
  • Author(s): T. Tsuboi
  • Organizer: The 23rd International Conference on Photochemistry 2007 (ICP2007)
  • Place of Presentation: ケルン大学(ドイツ)
  • Year and Date: 20070000
• [Presentation] Conformation of organic molecules in OLED thin films (2007)
  • Author(s): T. Tsuboi
  • Organizer: The International Display Manufacturing Conference (IDMC 2007)
  • Place of Presentation: 貿易センター(台湾)
  • Year and Date: 20070000
• [Book] 有機EL照明システムの高輝度・高効率・長寿命化技術と開発動向 (2010)
  • Author(s): 坪井泰住, 他
  • Publisher: サイエンス&テクノロジー株式会社出版(印刷中)
• [Book] 有機EL照明システムの高輝度・高効率・長寿命化技術と開発動向 (2010)
  • Author(s): 鳥居康子, 坪井泰住
  • Publisher: サイエンス&テクノロジー株式会社出版(印刷中)
• [Book] 有機EL技術開発の最前線-高輝度・高精細・長寿命化・ノウハウ集- (2008)
  • Author(s): 坪井泰住, 他
  • Total Pages: 197-207
  • Publisher: 技術情報協会出版
• [Book] FPDの比較と製造プロセス～各種部材への要求特性と性能評価～ (2008)
  • Author(s): 坪井泰住, 他
  • Total Pages: 316-330
  • Publisher: KK情報機構出版
• [Book] ラボレベル・研究初期で必要となる発光素子, 発光デバイス開発のための基礎技術・装置・測定, 評価法 (2008)
  • Author(s): 坪井泰住, 他
  • Total Pages: 159-182
  • Publisher: K K情報機構出版
• [Book] Trends in Optical Materials Research (2007)
  • Author(s): T.Tsuboi, et.al.
  • Total Pages: 55-90
  • Publisher: Nova Science Publishers
• [Remarks] 坪井泰住、低コスト白色発光有機el素子開発の現状:固体発光電気化学セル、月刊ディスプレイ5月号特集「LED・有機EL照明」第16巻5号、2010、印刷中
• [Remarks] 坪井泰住、単一発光材料を用いる白色有機EL素子への新しい取組み、月刊「マテリアルステージ(Material Stage)」第9巻第10号、2010、pp.72-77
• [Remarks] 坪井泰住、白色高分子有機EL素子開発の動向、国際技術情報誌M&E (Mechanical Material Manufacturing and Electronics Equipment Engineering)4月号、2009、pp.159-164
• [Remarks] 坪井泰住、有機燐光分子薄膜の濃度消光、月刊ディスプレイ、第13巻9号、2007、pp.21-29
• [Remarks] T. Tsuboi and N. Aljaroudi, Electronic Relaxation Processes in the T1 State of Phosphorescent Ir(ppy)3, Proceedings of the 14th International Workshop on Inorganic and Organic Electroluminescence EL2008, 2008, pp.455-458.
• [Remarks] T. Tsuboi, W.S. Jeon and J.H. Kwon, Enhancement of Phosphorescence from Organic Fluorescent Materials Bebq2 and Alq3 by Sensitization, Digest of Technical Papers of IMID/IDMC2008, 2008, pp.1509-1512.
• [Remarks] A.K. Bansal, A. Penzkofer, W. Holzer and T. Tsuboi, Photodynamics of OLED triplet emitters Ir(ppy)3 and PtOEP, Proceedings of The 6th International Conference on Electronic Processes in Organic Materials (ICEPOM-6), Molecular Crystals and Liquid Crystals Vol.467, No.1, 2007, pp.21-31.
• [Remarks] 坪井泰住、照明用白色有機elの開発と今後の展開;エレクトロニックジャーナル第226回テクニカルシンポジウム「有機el照明の最善線:徹底検証」2009、東京
• [Remarks] 坪井泰住、照明用有機el材料開発の現状とその評価;第5回「オルガテクノ20 09」専門セミナー「有機el技術」セッション、2009、東京
• [Remarks] 坪井泰住、有機el材料と照明の技術動向;サイエンス&テクノロジーKKセミナー「次世代照明の最新技術と市場展望」、2009、東京
• [Remarks] 坪井泰住、高分子白色有機el素子の開発状況、技術情報協会講演会「高分子有機e lの材料開発動向と素子の劣化機構」、2009、東京
• [Remarks] 坪井泰住、有機EL素子材料の評価と白色有機EL素子の開発、サイエンス&テクノロジーKK「研究者・技術者のためのセミナー」、2008、東京
• [Remarks] 坪井泰住、照明用有機EL材料の開発と評価、技術情報協会電気電子材料通信系セミナー「次世代照明LED・有機EL照明の技術動向」、2009、東京
• [Remarks] 坪井泰住、照明用途での展開も注目される有機E L、プレスジャーナル主催「有機EL入門」セミナー、2008、東京
• [Remarks] 坪井泰住、有機e l発光材料の分光データ解析と評価技術、技術情報協会「有機EL」講習会、2008、東京
• [Remarks] 坪井泰住、テレビと照明に技術開発はなぜ必要か、青森県立八戸工科学院、2010、青森県八戸市
• [Remarks]
  • URL: http://www.cc.kyoto-su.ac.jp/~tsuboi/
• [Remarks] 坪井泰住、テレビの進化+液晶プラズマテレビから有機elテレビへ、そして-、京都市立紫野高校、2008、京都ホームページ