Color tunability in non-doped single-layer PLEDs from a carbazole-based electroluminescent polymer

A conjugated polymer with a carbazole moiety, poly(3,6-divinylene-N-octyl-carbazole-p-phenylene), was synthesized by Wittig reaction. The polymer can be dissolved in common organic solvents such as THF, chloroform, etc. Using this polymer as an active layer, single-layer non-doped PLEDs with different thicknesses were fabricated by a spin-coating approach. The results suggested that electroluminescence spectra are changed with the film thickness of the polymer emitter. Fortunately, CIE 1931 coordinate values are moved to the white-light region only by changing the film thickness. Copyright © 2008 John Wiley & Sons, Ltd.

[1]  Hwan-Kyu Kim,et al.  Novel silicon-based copolymers for tunable light-emitting diodes: synthesis and characterization , 2000 .

[2]  Junbiao Peng,et al.  Efficient polymer white-light-emitting diodes with a single-emission layer of fluorescent polymer blend , 2007 .

[3]  Qi Zhou,et al.  The First Single Polymer with Simultaneous Blue, Green, and Red Emission for White Electroluminescence , 2005 .

[4]  Donal D. C. Bradley,et al.  Space-charge limited conduction with traps in poly(phenylene vinylene) light emitting diodes , 1997 .

[5]  I. Willner,et al.  Adjustable electroluminescence: blue-green to red organic light-emitting diodes based on novel poly-non-conjugated oligomers , 1999 .

[6]  Martin R. Bryce,et al.  White polymeric light-emitting diode based on a fluorene polymer∕Ir complex blend system , 2005 .

[7]  Q. Hou,et al.  High‐Efficiency White‐Light Emission from a Single Copolymer: Fluorescent Blue, Green, and Red Chromophores on a Conjugated Polymer Backbone , 2007 .

[8]  Yong Cao,et al.  High‐Efficiency White‐Light‐Emitting Devices from a Single Polymer by Mixing Singlet and Triplet Emission , 2006 .

[9]  Z. Xie,et al.  Molecular Design on Highly Efficient White Electroluminescence from a Single‐Polymer System with Simultaneous Blue, Green, and Red Emission , 2007 .

[10]  A. Holmes,et al.  Recent Developments in Light-Emitting Polymers , 2002 .

[11]  Yang Yang,et al.  Efficient single-layer “twistacene”-doped polymer white light-emitting diodes , 2004 .

[12]  Junbiao Peng,et al.  Fluorene-Based Single-Chain Copolymers for Color-Stable White Light-Emitting Diodes , 2007 .

[13]  Mario J. Cazeca,et al.  Voltage tunable multicolor light emitting diodes based on a dye-doped polythiophene derivative , 2002 .

[14]  Stephen R. Forrest,et al.  White Organic Light‐Emitting Devices for Solid‐State Lighting , 2004 .

[15]  S. Liu,et al.  Single emitting layer white organic light-emitting device with high color stability to applied voltage , 2006, Displays.

[16]  Wen‐Chang Chen,et al.  New Fluorene-Acceptor Random Copolymers: Towards Pure White Light Emission from a Single Polymer , 2006 .

[17]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[18]  Xuezhong Jiang,et al.  Color-tunable polymeric light-emitting diodes based on blend of CN-PPV and PVK , 1997 .

[19]  Jwo-Huei Jou,et al.  Efficient, color-stable fluorescent white organic light-emitting diodes with single emission layer by vapor deposition from solvent premixed deposition source , 2006 .

[20]  Chia-Ching Wu,et al.  Tunable and white light-emitting diodes of monolayer fluorinated benzoxazole graft copolymers , 2004 .

[21]  Peter Strohriegl,et al.  Carbazole-containing polymers: synthesis, properties and applications , 2003 .

[22]  Maksudul M. Alam,et al.  Nanophase-Separated Blends of Acceptor and Donor Conjugated Polymers. Efficient Electroluminescence from Binary Polyquinoline/Poly(2-methoxy-5-(2‘-ethylhexyloxy)-1,4-phenylenevinylene) and Polyquinoline/Poly(3-octylthiophene) Blends , 2003 .

[23]  Junbiao Peng,et al.  Efficient white-light-emitting diodes based on polymer codoped with two phosphorescent dyes , 2005 .

[24]  C. Shu,et al.  Efficient White‐Electrophosphorescent Devices Based on a Single Polyfluorene Copolymer , 2007 .

[25]  Teng‐Ming Chen,et al.  White light generation under violet-blue excitation from tunable green-to-red emitting Ca2MgSi2O7:Eu,Mn through energy transfer , 2007 .

[26]  Chien-Hung Li,et al.  Efficient pure-white organic light-emitting diodes with a solution-processed, binary-host employing single emission layer , 2006 .

[27]  Chen‐Han Chien,et al.  Bright-White Light-Emitting Devices Based on a Single Polymer Exhibiting Simultaneous Blue, Green, and Red Emissions , 2007 .

[28]  C. Lee,et al.  Poly(arylenevinylene) blends for white light emitting diodes , 2006 .

[29]  Yunqi Liu,et al.  Organic light-emitting diode based on a carbazole compound , 2006 .

[30]  G. Gigli,et al.  Controlling non-radiative energy transfer in organic binary blends: a route towards colour tunability and white emission from single-active-layer light-emitting devices , 2003 .

[31]  L. Do,et al.  White light emitting diodes using polymer blends , 2003 .

[32]  F. S. Wang,et al.  Highly Efficient Pure‐White‐Light‐Emitting Diodes from a Single Polymer: Polyfluorene with Naphthalimide Moieties , 2006 .

[33]  Monica Katiyar,et al.  Various approaches to white organic light emitting diodes and their recent advancements , 2006 .

[34]  Bo-Yu Chen,et al.  Color-tunable multilayer light-emitting diodes based on conjugated polymers , 2004 .

[35]  H. Shim,et al.  The Fabrication and Characterization of Single‐Component Polymeric White‐Light‐Emitting Diodes , 2005 .

[36]  R. Cingolani,et al.  Tunable white light generation by modified oligothiophenes blends , 2001 .

[37]  Synthesis and characterization of photoelectronic polymers containing triphenylamine moiety , 2007 .

[38]  S. Hsu,et al.  White-light-emitting diodes from single polymer systems based on polyfluorene copolymers end-capped with a dye , 2007 .