Bright white organic light-emitting diode

A very bright white organic light-emitting diode (OLED) was realized by using a bright blue-emitting layer, 1,7-diphenyl-4-biphenyl-3,5-dimethyl-1,7-dihydrodipyrazolo[3,4-b;4′,3′-e]pyridine (PAP-Ph), together with a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyry)-4H-pyran (DCM)-doped Alq [tris(8-hydroxyquinolinato) aluminum (III)] layer to provide blue, red, and green emission for color mixing. By appropriately controlling the layer thickness, the white light OLED achieved good performance of 24 700 cd/m2 at 15 V, 1.93 lm/W at 6.5 V, and >300 cd/m2 at 7.7 mA/cm2. The Commission Internationale de l’Eclairage coordinates of the emitted light are quite stable at voltages from 6 to 12 V, ranging from (0.35, 0.34) to (0.34, 0.35).

[1]  Y. Tao,et al.  Blue Light-Emitting Diodes Based on Dipyrazolopyridine Derivatives , 2000 .

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

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

[4]  Shiyong Liu,et al.  Organic white light electroluminescent devices , 2000 .

[5]  J. Farenc,et al.  The effect of the thicknesses of the various layers on the colour emitted by an organic electroluminescent device , 1998 .

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

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

[8]  S. Chen,et al.  White light emission from exciplex in a bilayer device with two blue light-emitting polymers , 1998 .

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

[10]  Stephen R. Forrest,et al.  Achieving full-color organic light-emitting devices for lightweight, flat-panel displays , 1997 .

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

[12]  Shigeki Naka,et al.  Organic Electroluminescent Devices Using a Mixed Single Layer , 1994 .

[13]  Josef Salbeck,et al.  White Light Emission from Organic LEDs Utilizing Spiro Compounds with High‐Temperature Stability , 2000 .

[14]  Jingsong Huang,et al.  White light emission induced by confinement in organic multiheterostructures , 1999 .

[15]  Y. Tao,et al.  Sharp green electroluminescence from 1H-pyrazolo[3,4-b]quinoline-based light-emitting diodes , 2000 .

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

[17]  Katsutoshi Nagai,et al.  Single‐layer white light‐emitting organic electroluminescent devices based on dye‐dispersed poly(N‐vinylcarbazole) , 1995 .

[18]  Lewis J. Rothberg,et al.  Color variation with electroluminescent organic semiconductors in multimode resonant cavities , 1994 .