Highly efficient pure blue electroluminescence from 1,4-bis[2-(3-N-ethylcarbazoryl)vinyl]benzene

An efficient blue organic light-emitting diode with 1,4-bis[2-(3-N-ethylcarbazoryl)vinyl]benzene doped into 4,4′-N,N′-dicarbazole-biphyenyl is reported. Maximum luminance and external quantum efficiency are 8500 cd/m2 and 2.6%. CIE-1931 coordinates are x=0.15, y=0.16. The device performance was further improved by introducing bis(2-methyl-8quinolinato)4-phenylphenolate aluminum to assist electron injection. The maximum luminance and quantum efficiency reached 11000 cd/m2 and 3.3%, respectively. Foster energy transfer and especially a carrier trapping mechanism are considered to dominate in the process of electroluminescence.

[1]  Stephen R. Forrest,et al.  High operational stability of electrophosphorescent devices , 2002 .

[2]  P. A. Martic,et al.  Efficient organic electroluminescent device using a single bipolar carrier transport layer , 1992 .

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

[4]  Y. Tao,et al.  Light-Emitting Diodes Based on a Carbazole-Derivatized Dopant: Origin of Dopant Excitation as a Function of the Device Structure , 2002 .

[5]  Stephen R. Forrest,et al.  Three-Color, Tunable, Organic Light-Emitting Devices , 1997 .

[6]  S. Forrest,et al.  VERY HIGH-EFFICIENCY GREEN ORGANIC LIGHT-EMITTING DEVICES BASED ON ELECTROPHOSPHORESCENCE , 1999 .

[7]  Chishio Hosokawa,et al.  Organic multi-color electroluminescence display with fine pixels , 1997 .

[8]  Hiroshi Tokailin,et al.  EFFICIENT ELECTROLUMINESCENCE OF DISTYRYLARYLENE WITH HOLE TRANSPORTING ABILITY , 1995 .

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

[10]  S. M. Sze,et al.  Physics of semiconductor devices , 1969 .

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

[12]  Stephen R. Forrest,et al.  Operating lifetime of phosphorescent organic light emitting devices , 2000 .

[13]  Tadashi Kusumoto,et al.  Highly efficient blue electroluminescence from a distyrylarylene emitting layer with a new dopant , 1995 .

[14]  Stephen R. Forrest,et al.  Improved energy transfer in electrophosphorescent devices , 1999 .

[15]  Ching Wan Tang,et al.  Doped organic electroluminescent devices with improved stability , 1997 .

[16]  Stephen R. Forrest,et al.  Bright, saturated, red-to-yellow organic light-emitting devices based on polarization-induced spectral shifts , 1998 .

[17]  Masayoshi Yoshida,et al.  Polarity-dependent multicolor organic electroluminescent device , 1996 .