White electroluminescence from polyfluorene chemically doped with 1,8-napthalimide moieties

An efficient white light-emitting polymer was developed with blue polyfluorene (PFO) chemically doped with orange fluorescent 1, 8-naphthalimide moieties. The emission spectrum can be easily tuned by varying the content of 1, 8-naphthalimide moieties. A white polymeric light-emitting diode (WPLED) with a structure of indium tin oxide (ITO)/the complex of (3,4-ethylenedioxythiophene) and polystyrene sulfonic acid (PEDOT)/polymer∕Ca∕Al showed a current efficiency of 5.3cd∕A and a power efficiency of 2.8Lm∕W at 6V with the Commission Internationale de L'Eclairage (CIE) coordinates at (0.25,0.35). Moreover, the WPLED from the copolymer showed a very stable white light emission at different driving voltage and brightness. The CIE coordinates of the WPLED were (0.25, 0.35), (0.26, O.36), and (0.26, 0.36) under driving voltages of 6, 8, and 10V, corresponding to the brightness of 82, 3555, and 7530cd∕m2, respectively. This approach for realization of white light emission is promising over the polymer blending sy...

[1]  E. List,et al.  Efficient red- and orange-light-emitting diodes realized by excitation energy transfer from blue-light-emitting conjugated polymers , 1997 .

[2]  C. H. Chen,et al.  Electroluminescence of doped organic thin films , 1989 .

[3]  Ullrich Scherf,et al.  Efficient white light-emitting diodes realized with new processable blends of conjugated polymers , 1997 .

[4]  Stephen R. Forrest,et al.  White-light-emitting organic electroluminescent devices based on interlayer sequential energy transfer , 1999 .

[5]  S. Chen,et al.  White-light emission from electroluminescence diode with polyaniline as the emitting layer , 1996 .

[6]  Katsutoshi Nagai,et al.  Multilayer White Light-Emitting Organic Electroluminescent Device , 1995, Science.

[7]  Hwan-Kyu Kim,et al.  White Light-Emitting Diodes from Novel Silicon-Based Copolymers Containing Both Electron-Transport Oxadiazole and Hole-Transport Carbazole Moieties in the Main Chain† , 2002 .

[8]  R. Friend,et al.  NAPHTHALIMIDE SIDE-CHAIN POLYMERS FOR ORGANIC LIGHT-EMITTING DIODES : BAND-OFFSET ENGINEERING AND ROLE OF POLYMER THICKNESS , 1998 .

[9]  W. Fann,et al.  White-light electroluminescence from soluble oxadiazole-containing phenylene vinylene ether-linkage copolymer , 2001 .

[10]  Ananth Dodabalapur,et al.  White organic electroluminescence devices , 1996 .

[11]  A. Epstein,et al.  Novel luminescent carbazole-naphthalimide dyads for single-layer electroluminescent device , 2001 .

[12]  T. J. Chow,et al.  White light emission from single component polymers fabricated by spin coating , 2003 .

[13]  Yasuo Tomita,et al.  Highly-bright white organic light-emitting diodes based on a single emission layer , 2002 .

[14]  Joseph Shinar,et al.  Bright white small molecular organic light-emitting devices based on a red-emitting guest–host layer and blue-emitting 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl , 2002 .

[15]  A. Dodabalapur,et al.  Organic Multilayer White Light Emitting Diodes , 1996 .

[16]  Feng Li,et al.  White organic light-emitting devices using a phosphorescent sensitizer , 2003 .

[17]  Olle Inganäs,et al.  White light emission from a polymer blend light emitting diode , 1996 .

[18]  Stephen R. Forrest,et al.  Controlling Exciton Diffusion in Multilayer White Phosphorescent Organic Light Emitting Devices , 2002 .

[19]  Katsutoshi Nagai,et al.  White light‐emitting organic electroluminescent devices using the poly(N‐vinylcarbazole) emitter layer doped with three fluorescent dyes , 1994 .

[20]  H. Tian,et al.  1,8-Naphthalimides for non-doping OLEDs: the tunable emission color from blue, green to red , 2004 .