Organic light emitting diode with increased radical anion stability and applications thereof
View Patent ↗An organic light emitting diode (OLED) having an improved service life and improved transport of negative charge carriers. The organic light emitting diode based on an organic semiconductor material in which the transport of negative charge carriers and the stability with respect to reduction are determined by azahetarylene/Lewis acid complex units. This leads to an improved service life of the emission layer, which firstly increases the service life of the component and avoids readjustment of the brightness during operation. Organic light emitting diodes are disclosed in which the position of the emission zone in the emitter layer and the color of the emission can be specifically influenced by azahetarylene/Lewis acid complex units.
1. An organic light emitting diode or illuminated display, comprising:
at least one substrate;
a lower, at least semitransparent electrode;
a hole-conducting layer;
an emitter layer; and
an upper electrode;
wherein tetravalent azahetarylene/Lewis acid complex units copolymerized in a copolymer with monomer units of polyfluorene, wherein a monomer unit is 9, 9-dialkylfluorene, wherein the copolymer is introduced into at least one of the layers;
wherein the azahetarylene/Lewis acid complex units act as electron-transporting components and comprise a structural unit in accordance with the relationship:
LA being a Lewis acid central atom, wherein the Lewis acid central atom is boron,
L 1 and L 2 being monodentate alkoxy or alkyl organic radicals, wherein the bidentate ligand of the azahetarylene/Lewis acid complex units are derivatives of 8-hydroxyquinoline and wherein the 9, 9-dialkylfluorene units are linked to the azahetarylene/Lewis acid complex units via the bidentate ligands of the 8-hydroxyquinoline-derivatives.
2. The organic light emitting diode or illuminated display as claimed in claim 1 , wherein the organic light emitting diode or illuminated display is implemented at least one of for illumination purposes, for one of monochrome, multicolor or full-color organic illuminated displays based on color filters or structured, RGB-pixellated emitter layers, and for passive matrix displays.
3. The organic light emitting diode or illuminated display as claimed in claim 1 , wherein the azahetarylene/Lewis acid complex units are in the emitter layer.