Organic light-emitting diode and uses thereof
View Patent ↗The invention relates to an organic light-emitting diode (OLED) having an improved lifetime and improved transport of negative charge carriers. The organic light-emitting diode is based on an organic semiconductor material, in which the transport of negative charge carriers and stability with respect to reduction is achieved with triarylated Lewis acid units, in particular perarylated borane units. This leads to an improved lifetime of the emission layer which in turn increases the lifetime of the component and eliminates the need for correcting brightness during operation. Furthermore, the invention relates to organic light-emitting diodes in which the position of the emission zone in the emitter layer and the color of the emission can be influenced in a targeted manner through triarylated Lewis acids such as perarylated borane units.
1. An organic light-emitting diode comprising an active layer of organic semiconductor material including at least partially triaryl-substituted Lewis acid units, which are polymerized or added as a polymer component to the organic semiconductor material to form a blend wherein:
the Lewis acid units are borane units; and
at least two of the three aryl substituents of the borane unit are part of a polymer main chain and not directly bonded to each other,
wherein at least 50% of the recurring units of the organic semiconductor material are arylenevinylene units, paraphenylene derivative units or a combination thereof and between 1% and 50% of the recurring units are triaryl-substituted Lewis acid units; and
wherein the paraphenylene derivative units are at least partially fluorene derivative units or polyspirofluorene.
2. An organic light-emitting diode according to claim 1 , wherein the triaryl-substituted Lewis acid units are borane units of formula —Ar—B(Ar)—Ar—.
3. The organic light-emitting diode according to claim 1 , wherein the triaryl-substituted Lewis acid units include at least one polycyclic aryl substituent.
4. The organic light-emitting diode according to claim 1 , wherein the organic semiconductor material comprises between 1% and 49% of triarylamine derivative units.
5. The organic light-emitting diode according to claim 1 , in which the triaryl-substituted Lewis acid units in the organic semiconductor material are configured to emit blue light.
6. The organic light-emitting diode according to claim 1 , in which the triaryl-substituted Lewis acid units in the organic semiconductor material shift the emission spectrum of the organic semiconductor material by less than 30 nm.
7. The organic light-emitting diode according to claim 1 , in which the triaryl-substituted Lewis acid units in the organic semiconductor material act at least partially as chromophores by shifting the emission spectrum of the organic semiconductor material to a longer wavelength than the organic semiconductor material without the Lewis acid units.
8. A method of using the organic light-emitting diode according to claim 1 , comprising triggering the light-emitting diode to produce broadband white light.
9. A method of using the organic light-emitting diode according to claim 1 , comprising triggering the light-emitting diode to produce light.
10. A method of using the organic light-emitting diode of claim 1 , comprising triggering the light-emitting diode to produce monochromatic, multicolor or full-color organic electroluminescence display, wherein the triggering is active or passive matrix triggering.
11. The method according to claim 10 , further comprising emitting light from the light-emitting diode through color filters.
12. A method of using the organic light-emitting diode according to claim 1 , in which the Lewis acid unit content is coordinated with pulsed driver conditions in a passive matrix display, the method comprising driving the organic light-emitting diode.
13. The method according to claim 10 , wherein triggering the light-emitting diode comprises triggering a light-emitting diode with structured RGB-pixelated emitter layers.
14. The organic light-emitting diode according to claim 1 , wherein the aryl substituents are homoaromatic or heteroaromatic compounds.