Luminescent properties of a novel fluorene organic material.

The photo-physical properties of 6,6'-(9H-fluoren-9,9-diyl)bis(2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)quinoxaline) (BFLBBFLYQ) and its blend doped with N'-biphenyl-N,N'-bis-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) were investigated. The absorption, photoluminescence (PL) and electroluminescence (EL) properties of pristine BFLBBFLYQ and blend in solution and spin-coated film are outlined, including a discussion of charge-transfer (CT) exciplex emission of BFLBBFLYQ:TPD blend in the solid state. The luminescent properties of BFLBBFLYQ films using different deposition processes were studied. It was found that the low-energy emission bands at 530-570 nm appeared in the PL spectra of BFLBBFLYQ evaporated films in ultra-high vacuum. Also, the low-energy band was the exclusive emission in the EL spectra of BFLBBFLYQ films.

[1]  Jean-Luc Brédas,et al.  Effects of intermolecular interactions on the lowest excited state in luminescent conjugated polymers and oligomers , 1997 .

[2]  Shizuo Tokito,et al.  Highly efficient pure blue electroluminescence from polyfluorene: Influence of the molecular weight distribution on the aggregation tendency , 2000 .

[3]  Gerrit Klaerner,et al.  Oxidative Stability and Its Effect on the Photoluminescence of Poly(Fluorene) Derivatives: End Group Effects , 1999 .

[4]  Charles E. Swenberg,et al.  Electronic Processes in Organic Crystals and Polymers , 1999 .

[5]  Egbert Zojer,et al.  The Origin of Green Emission in Polyfluorene‐Based Conjugated Polymers: On‐Chain Defect Fluorescence , 2003 .

[6]  Ullrich Scherf,et al.  The Effect of Keto Defect Sites on the Emission Properties of Polyfluorene-Type Materials , 2002 .

[7]  R. Mallavia,et al.  On the Origin of Green Emission Bands in Fluorene‐Based Conjugated Polymers , 2007 .

[8]  H. Shim,et al.  Keto defect sites in fluorene-based organic field-effect transistors: The origin of rapid degradation on the performance of the device , 2005 .

[9]  Daniel Moses,et al.  Stabilized Blue Emission from Polyfluorene‐Based Light‐Emitting Diodes: Elimination of Fluorenone Defects , 2003 .

[10]  E. List,et al.  Comparison of thermal and electrical degradation effects in polyfluorenes , 2003 .

[11]  Jan Kalinowski,et al.  Efficient exciplex emitting organic electroluminescent devices , 2002 .

[12]  J. C. Scott,et al.  Electrical and Photoinduced Degradation of Polyfluorene Based Films and Light-Emitting Devices , 1999 .

[13]  T. Ouisse,et al.  Degradation kinetics of the spectral emission in polyfluorene light-emitting electro-chemical cells and diodes , 2003 .

[14]  K. Ahn,et al.  The conjugation effects on the luminescence properties of oligophenylenes for the OLED , 2004 .

[15]  Zhishan Bo,et al.  Preparation and optical investigation of monodisperse oligo(9,9-dioctylfluorene)s containing one fluorenone unit. , 2005, Chemistry.

[16]  Byeong Kwon Ju,et al.  Spectral broadening in electroluminescence of white organic light-emitting diodes based on complementary colors , 2007 .

[17]  Jacek Ulanski,et al.  Thermoluminescence and electroluminescence of annealed polyfluorene layers , 2003 .

[18]  Ullrich Scherf,et al.  Semiconducting Polyfluorenes—Towards Reliable Structure–Property Relationships , 2002 .

[19]  E. List,et al.  Emission properties of pristine and oxidatively degraded polyfluorene type polymers , 2004 .

[20]  Heinz-Georg Nothofer,et al.  Identification of Emissive Interface-Related Defects in Polyfluorene-Based Light Emitting Devices , 2004 .

[21]  E. List,et al.  Excimers or Emissive On-Chain Defects? , 2003 .

[22]  Zhijian Chen,et al.  Blue emission from light-emitting diodes based on lithium complex , 2002 .

[23]  S. Jenekhe,et al.  Fluorenone-Containing Polyfluorenes and Oligofluorenes: Photophysics, Origin of the Green Emission and Efficient Green Electroluminescence† , 2004 .

[24]  C. Shu,et al.  Synthesis and characterization of spiro-linked poly(terfluorene): a blue-emitting polymer with controlled conjugated length , 2002 .

[25]  Wei Li,et al.  High-Efficiency White Organic Light-Emitting Diodes Based on Phosphorescent Iridium Complex and 4,4'-Bis[N-1-napthyl-N-phenyl-amino]biphenyl Emitters , 2007 .

[26]  S. Chua,et al.  Spectral and Thermal Spectral Stability Study for Fluorene-Based Conjugated Polymers , 2002 .

[27]  Wenqing Zhu,et al.  A novel fluorene derivative containing four triphenylamine groups: Highly thermostable blue emitter with hole-transporting ability for organic light-emitting diode (OLED) , 2005 .

[28]  M. Grell,et al.  Understanding the Origin of the 535 nm Emission Band in Oxidized Poly(9,9‐dioctylfluorene): The Essential Role of Inter‐Chain/Inter‐Segment Interactions , 2004 .

[29]  Hugh D. Burrows,et al.  Fast and Slow Time Regimes of Fluorescence Quenching in Conjugated Polyfluorene−Fluorenone Random Copolymers: The Role of Exciton Hopping and Dexter Transfer along the Polymer Backbone , 2006 .

[30]  Emil J. W. List,et al.  Poly(tetraarylindenofluorene)s: New Stable Blue-Emitting Polymers , 2003 .

[31]  S. Chen,et al.  Excimer Formation by Electric Field Induction and Side Chain Motion Assistance in Polyfluorenes , 2005 .

[32]  L. Do,et al.  Study of energy transfer from excited TPD to Alq in organic electroluminescent devices by time‐resolved fluorescence spectroscopy using a scanning near‐field optical atomic force microscope , 2001, Journal of microscopy.

[33]  S. Chen,et al.  Green emission from end-group-enhanced aggregation in polydioctylfluorene. , 2005, The journal of physical chemistry. B.

[34]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[35]  A. Heeger,et al.  Spiro-Functionalized Polyfluorene Derivatives as Blue Light-Emitting Materials , 2000 .

[36]  Uli Lemmer,et al.  AGGREGATE FLUORESCENCE IN CONJUGATED POLYMERS , 1995 .

[37]  Junsheng Yu,et al.  Bright-Yellow Organic Light-Emitting Device Using Novel Silole Derivative as Emitter , 2007 .

[38]  Junsheng Yu,et al.  High efficiency organic light-emitting diodes with yellow phosphorescent emission based on a novel iridium complex , 2007 .

[39]  Wei Huang,et al.  Fluorene-substituted pyrenes : Novel pyrene derivatives as emitters in nondoped blue OLEDs , 2006 .

[40]  J. C. Scott,et al.  Cross-linkable Polymers Based on Dialkylfluorenes , 1999 .

[41]  John M. Lupton,et al.  On-chain defect emission in electroluminescent polyfluorenes , 2002 .

[42]  J. Lupton,et al.  Recombination kinetics in wide gap electroluminescent conjugated polymers with on-chain emissive defects , 2003 .

[43]  Piero Mastrorilli,et al.  Insight into the Role of Oxidation in the Thermally Induced Green Band in Fluorene‐Based Systems , 2007 .

[44]  E. Conwell.  Excimer Formation and Luminescence in Conducting Polymers , 1997 .

[45]  Donal D. C. Bradley,et al.  Interplay of Physical Structure and Photophysics for a Liquid Crystalline Polyfluorene , 1999 .

[46]  Liduo Wang,et al.  Facile synthesis and properties of binaphthyl-containing blue light emitting materials , 2007 .

[47]  V. Cimrová,et al.  Microcavity devices based on a ladder-type poly(p-phenylene) emitting blue, green, and red light , 1996 .

[48]  G. Wegner,et al.  Monodisperse oligofluorenes with keto defect as models to investigate the origin of green emission from polyfluorenes: synthesis, self-assembly, and photophysical properties. , 2005, Chemistry.

[49]  Soon-Ki Kwon,et al.  Effect of a perfluorocyclopentene core unit on the structures and photoluminescence of fluorene- and anthracene-based compounds , 2006 .

[50]  Josef Salbeck,et al.  Low molecular organic glasses for blue electroluminescence , 1997 .

[51]  The role of keto defect sites for the emission properties of polyfluorene-type materials , 2003 .

[52]  E. List,et al.  Polyfluorenes with Dendron Side Chains as the Active Materials for Polymer Light‐Emitting Devices , 2002 .