Efficient, color-stable fluorescent white organic light-emitting diodes with single emission layer by vapor deposition from solvent premixed deposition source

Efficient, color-stable fluorescent white organic light-emitting diodes (OLEDs) with single emission layer were fabricated by vapor deposition from solvent premixed mixtures of 1,4-bis(2,2-diphenylvinyl)biphenyl doped with 4-(dicyanomethylene)-2-methyl-6-(julolidin-4-yl-vinyl)-4H-pyran and/or 10-(2-benzothiazolyl)-2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H,5H,11H-(1)benzopy-rano(6,7,8-l, j)quinolizine-11-one. The power efficiencies at 100 cd/m2 were 4.6 lm/W for the two-spectrum pure white OLEDs and 7.2 lm/W m2 for the three-spectrum ones with white emission. By using a different host of 10,10′-bis(biphenyl-4-yl)-9,9′-bianthryl and a greenish-blue dye of di(triphenylamine)-1,4-divinylnaphthalene, the three-spectrum OLEDs with a power efficiency of 6.8 lm/W at 100 cd/m2 were obtained.

[1]  O. Prache,et al.  Active matrix molecular OLED microdisplays , 2001 .

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

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

[4]  Stephen R. Forrest,et al.  Tuning the color emission of thin film molecular organic light emitting devices by the solid state solvation effect , 1999 .

[5]  M. Schaer,et al.  Doping‐Induced Charge Trapping in Organic Light‐Emitting Devices , 2005 .

[6]  Gang Li,et al.  Combinatorial fabrication and studies of bright white organic light-emitting devices based on emission from rubrene-doped 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl , 2003 .

[7]  John E. Ludwicki,et al.  P-138 Systems-Level Comparison of Singlet- and Triplet-Based Full-Color AM-OLED Displays for Power, Lifetime, and Color Gamut , 2005 .

[8]  Yang Yang,et al.  White organic light-emitting diodes prepared by a fused organic solid solution method , 2005 .

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

[10]  Jan Kalinowski,et al.  Voltage‐tunable‐color multilayer organic light emitting diode , 1996 .

[11]  Ching Wan Tang,et al.  Current-induced fluorescence quenching in organic light-emitting diodes , 2002 .

[12]  Th. Förster.  Zwischenmolekulare Energiewanderung und Fluoreszenz , 1948 .

[13]  Y. Tao,et al.  Energy transfer vs. carrier trapping: emission mechanism in dye-doped organic light emitting diodes , 2002 .

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

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

[16]  Jwo-Huei Jou,et al.  High-efficiency white organic light-emitting devices with dual doped structure , 2002 .

[17]  Yu-Tai Tao,et al.  White organic light-emitting diodes based on 2,7-bis(2,2-diphenylvinyl)-9,9 ' -spirobifluorene: Improvement in operational lifetime , 2004 .