White organic light-emitting diodes prepared by a fused organic solid solution method

This letter demonstrates a white organic light-emitting diode (OLED) with high color stability fabricated by using a single organic white-emitting layer. The dopants were introduced prior to the device fabrication process through organic solid solution process formed by high-temperature and high-pressure fusion process. A high band gap organic material, α-naphthlyphenylbiphenyl diamine, was adopted and precisely doped with several kinds of fluorescent dyes as the emitting material. The most important benefits of using this fused organic solid-solution technique are the precise control of dopants, ultrauniform mixture of dopants in the host, easy fabrication; and, as a result, the fabricated white OLEDs show extremely little color shift with increasing injection current. The simplified device fabrication process is believed to be beneficial to the white OLED display and lighting industrialization.

[1]  Xueyin Jiang,et al.  Stable and current independent white-emitting organic diode , 2002 .

[2]  Stephen R. Forrest,et al.  Energy transfer in polymer electrophosphorescent light emitting devices with single and multiple doped luminescent layers , 2002 .

[3]  Joseph Shinar,et al.  Bright small molecular white organic light-emitting devices with two emission zones , 2002 .

[4]  Zhijian Chen,et al.  The pure white light emission from three-layer electroluminescent device , 2002 .

[5]  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 .

[6]  Kiyotaka Imai,et al.  Local lattice strain distribution around a transistor channel in metal–oxide–semiconductor devices , 2001 .

[7]  Libero Zuppiroli,et al.  Internal electric field and charge distribution in multilayer organic light-emitting diodes , 2003 .

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

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

[10]  S. Cho,et al.  Organic white-light-emitting devices based on balanced exciton-recombination-zone split using a carrier blocking layer , 2002 .

[11]  Jingsong Huang,et al.  Tuning of chromaticity in organic multiple-quantum well white light emitting devices , 2000 .

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

[13]  Donal D. C. Bradley,et al.  A glass‐forming conjugated main‐chain liquid crystal polymer for polarized electroluminescence applications , 1997 .

[14]  Katsutoshi Nagai,et al.  White-Light-Emitting Organic Electroluminescent Device Using Lanthanide Complexes , 1996 .

[15]  C.-H. Chen,et al.  Recent progress of molecular organic electroluminescent materials and devices , 2002 .

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