122results about How to "Lower LUMO level" patented technology

The invention discloses a dibenzo-heterocyclic compound, which has a structure represented by the formula (I). The LUMO energy level of the dibenzo-heterocyclic compound is low, the dibenzo-heterocyclic compound can be well matched with an electron transport material, and the electron injection and transportation are promoted. The dibenzo-heterocyclic compound has a good hole transport performance, is capable of balancing the ratio of electrons / holes in a luminous layer when being used as a luminous layer material, increases the compounding probability, and improves the luminous efficiency. Due to the spatial configuration of the dibenzo-heterocyclic compound, molecule stacking is avoided, the generation of high energy exciton generated by energy transmission between molecules is prevented, annihilation of exciton is inhibited, and the roll-off is inhibited. At the same time, the dibenzo-heterocyclic compound has good thermal stability and is capable of efficiently and stably emittingblue light. The invention also discloses an organic electroluminescent device, at least one functional layer of the device comprises the dibenzo-heterocyclic compound, and the blue light device has the advantages of high blue light luminous efficiency and low work voltage.

A polymer having a repeating unit represented by the following general formula (I) and a ferrocene-based reduction potential of −1.5 to −0.5 V as measured by a cyclic voltammetry methodwherein Ar1 represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group, and these groups may be substituted by a substituent.

The invention discloses a class of thienopyrrole quinone compound, a preparation method and its application as a semiconductor active layer in an organic field effect transistor. This type of compound has the characteristics of good molecular skeleton planarity, strong self-assembly ability, low LUMO energy level, narrow energy level band gap, and insensitivity to oxygen and water. The introduction of the pyrrole structure facilitates adjustment of sample dissolution through modification of substituents Good for solution processing. The organic field effect transistor with compound Ia as the semiconductor layer prepared by spin coating has excellent bipolar field effect performance (μh=5.3×10-3cm2V-1s-1,μe=7.7×10-3cm2V-1s-1) . Its switch current ratio is above 104, and it is stable in the air, so it has important application value.

Disclosed is a composition comprising a compound having residues of at least two nitrogenated polycyclic compounds selected from the group consisting of nitrogenated polycyclic compounds represented by formulae (1-1), (1-2), (1-3) and (1-4) [wherein R's independently represent a hydrogen atom or a substituent and may be the same as or different from one another] and a phosphorescence-emitting compound.