289results about How to "Improve hole transport ability" patented technology

A light-emitting element is disclosed that can drive at a low driving voltage and that has a longer lifetime than the conventional light-emitting element, and a method is disclosed for manufacturing the light-emitting element. The disclosed light-emitting element includes a plurality of layers between a pair of electrodes; and at least one layer among the plurality of layers contains one compound selected from the group consisting of oxide semiconductor and a metal oxide, and a compound having high hole transportation properties. Such the light-emitting element can suppress the crystallization of a layer containing one compound selected from the group consisting of oxide semiconductor and a metal oxide, and a compound having high hole transportation properties. As a result, a lifetime of the light-emitting element can be extended.

A light-emitting element is disclosed that can drive at a low driving voltage and that has a longer lifetime than the conventional light-emitting element, and a method is disclosed for manufacturing the light-emitting element. The disclosed light-emitting element includes a plurality of layers between a pair of electrodes; and at least one layer among the plurality of layers contains one compound selected from the group consisting of oxide semiconductor and a metal oxide, and a compound having high hole transportation properties. Such the light-emitting element can suppress the crystallization of a layer containing one compound selected from the group consisting of oxide semiconductor and a metal oxide, and a compound having high hole transportation properties. As a result, a lifetime of the light-emitting element can be extended.

To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, α1, α2, α3, and α4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar1 and Ar2 each represent an aryl group having less than or equal to 13 carbon atoms; R1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independently 0 or 1.

Disclosed is a light-emitting element which includes a first light-emitting layer over and in contact with a hole-transport layer and a second light-emitting layer over and in contact with the first light-emitting layer. The first and the second light-emitting layers contain a bipolar host material and an emissive guest material. The guest material in the first light-emitting layer has a lower ability for capturing a hole than a guest material in the second light-emitting layer; therefore, the hole-transport property of the first light-emitting layer can be controlled to be higher than that of the second light-emitting layer. The difference in hole-transport property between the first and second light-emitting layers allows a recombination region to be widely spread in the light-emitting layers. An anti-reducing material may be provided in the hole-transport layer, which prevents the hole-transport layer from being reduced by electrons which fail to undergo recombination in the light-emitting layers.

A subject for the invention is to provide a charge-transporting polymer having high hole-transporting ability and excellent solubility and film-forming properties and a composition for organic electroluminescent element which contains the charge-transporting polymer. Another subject for the invention is to provide an organic electroluminescent element which has a high current efficiency and high driving stability. The charge-transporting polymer comprises a group represented by the following formula (1) as a side chain:wherein in formula (1), the benzocyclobutene ring may have one or more substituents. The substituents may be bonded to each other to form a ring. The spacer represents a group which links the benzocyclobutene ring to the main chain of the charge-transporting polymer through three or more single bonds.

An object is to provide a light-emitting element having high light-emission efficiency by provision of a novel fluorene derivative as represented by General Formula (G1) below.In the formula, R1 to R8 independently represent any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted biphenyl group. Further, α1 to α4 independently represent any of a substituted or unsubstituted arylene group having 6 to 12 carbon atoms. Furthermore, Ar1 and Ar2 independently represent any of an aryl group having 6 to 13 carbon atoms in a ring and Ar3 represents an alkyl group having 1 to 6 carbon atoms or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms. J, k, m, and n each independently represent 0 or 1.

An organic compound having a low HOMO level and a high hole-transport property is provided. The organic compound is represented by Formula (G1), where Ar1 represents a substituted or unsubstituted fluorenyl group, Ar2 represents a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, and A1 represents any one of a substituted or unsubstituted dibenzofuranyl group and a substituted or unsubstituted dibenzothiophenyl group. The low HOMO level and the high hole-transport property of the organic compound allow the formation of an exciplex with another organic compound, which leads to a highly efficient light-emitting element in the presence of a phosphorescent compound due to the effective overlapping between the emission of the exciplex and the longest absorption band of the phosphorescent compound.

A layer included in an electroluminescent element is required to be thickened to optimize light extraction efficiency of the electroluminescent element and to prevent short-circuit between electrodes. However, in a conventional element material, desired light extraction efficiency cannot be accomplished since drive voltage rises or power consumption is increased as the element material is thickened. A composite is formed by mixing a conjugated molecule having low ionization potential and a substance having an electron-accepting property to the conjugated molecule. A composite layer included in an element is formed using the composite as an element material. The composite layer is arranged between a first electrode and a light emitting layer or between a second electrode and a light emitting layer. The composite layer has high conductivity; therefore, drive voltage does not rise even if a film thickness is increased. Thus, an electroluminescent element which can prevent short-circuit of an electrode can be provided.

A carbazole compound represented by General Formula (G1) is provided.In the formula, α represents a phenylene group, Ar1 represents an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, Ar2 represents hydrogen, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, Ar3 represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, or a substituted or unsubstituted phenanthryl group, and R1 represents hydrogen, an alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted phenyl group. Further, n is 0 or 1.

An object is to provide a light-emitting element with high emission efficiency. Another object is to provide a light-emitting element with a long lifetime and high reliability. Another object is to provide a light-emitting element driven at low voltage. A first light-emitting layer whose one surface is in contact with a hole-transport layer, and a second light-emitting layer which is in contact with the other surface of the first light-emitting layer and includes a bipolar host material and a light-emitting substance are provided, where the hole-transport property of the first light-emitting layer is higher than that of the second light-emitting layer. A recombination region of holes and electrons is preferably provided in the light-emitting layer. The hole-transport layer preferably includes an anti-reducing substance.

The present invention intends to provide a polymer which has a high singlet excited level and triplet excited level, is excellent in charge transportability and electrochemical stability, is capable of being laminated, causes less decomposition and is capable of providing a homogeneous film guality, and an organic electroluminescent element material and a composition for an organic electroluminescent element, and, to provide an organic electroluminescent element which has a high emission efficiency, is capable of low voltage driving and has a high driving stability, and a display and a lighting. The present invention relates to a polymer having a repeating unit represented by the following general formula (1) and a crosslinking group (in the general formula (1), Ar11 to Ar13 each independently represent a bivalent aromatic group, Ar14 and Ar15 each independently represent an aromatic group, Ar16 and Ar17 each independently represent a direct bond or a bivalent aromatic group, R11 and R12 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, or an aromatic group, and r represents an integer of 0 to 5, R11 and R12 may join to each other to form a ring structure. The crosslinking group may also be contained in the repetitive unit represented by the following general formula (1)).

The invention discloses a method for using a recrystallization method to prepare a lead-halide perovskite nanowire. The method comprises the step of dropwise adding a poor solvent and a polar aprotic solvent in a spin coating process of preparation of APbI3 perovskite through a one-step method to prepare the lead-halide perovskite nanowire. The preparing method has the advantages that the operation is simple and convenient, and the reaction time can be saved. One-dimensional perovskite nanocrystalline film prepared through the one-step method is uniform in length and good in coverage degree, and can be used as a candidate material for an optical detector and a laser device. Compared with pure perovskite, the perovskite nanowire has a better optical conduction capability, and can be used in devices like an optical conductor and the laser device.

The invention is applicable for the field of a light emitting diode, and provides a quantum dot light emitting diode containing a doped hole injection layer and a fabrication method of the quantum dot light emitting diode. The quantum dot light emitting diode comprises a substrate, an anode layer, the doped hole injection layer, a hole transfer layer, a quantum dot light emitting layer, an electron transfer layer and a cathode layer which are sequentially arranged in a lamination way, the doped hole injection layer is made of P-doped Poly-TPD, and a doping agent in the P-doped Poly-TPD is F4-TCNQ.

The invention provides an aromatic amine compound containing 9, 9'-spirobifluorene and dibenzofuran and an organic electroluminescent device thereof, and relates to the technical field of organic photoelectric materials. The preparation method of the compound is simple, the raw material is easy to obtain, the aromatic amine compound has the highest occupied molecular orbital energy level, a high T1 value and a high refractive index, has good hole transporting ability, thermal stability and film forming properties, is applied to the OLED device, can significantly improve the luminous efficiency, heat resistance and service life of the device and can effectively reduce the driving voltage of the device.

The invention provides a carbazole structure-containing derivative, and a preparation method and an organic electroluminescent device thereof, and belongs to the technical field of organic photoelectric materials. The compound has a structure represented by formula (I), and the R1, R2, Ar1 and Ar2 groups in the asymmetric structure carbazole structure are adjusted to improve the hole mobility andimprove the hole transportation performance, so the luminescence efficiency of the device is improved, and the compound is an organic luminescent material having good performances.

The invention relates to a white organic electroluminescent device and a preparation method thereof. The device consists of an ITO glass substrate, a buffer layer, a cavity transport layer, a single-subject blue light layer, a double-subject red light layer, an electronic transport layer and a composite cathode sequentially. Each structural layer is prepared by a vacuum evaporation method. In the structure of the invention, a luminous layer consists of the single-subject blue light layer and the red light layer with a double-subject structure, and the subject of the blue light layer and one of the subjects of the red light layer are made of the same material, and the other material of the subject of the red light layer is the same as the material of the electronic transport layer. The device with the structure has higher luminous efficiency, can effectively disperse excitons, enhances carrier infusion and transport balance, and inhibits color error and efficiency reduction under a higher drive current. With the structure, the white organic electroluminescent device with the structure can be widely applied on a hi-fi organic full-color display device.

The invention discloses an organic compound containing spirofluorene dibenzocycloheptene and an application of the organic compound. The compound with spirofluorene dibenzocycloheptene as a core is connected with a nitrogen-containing branched chain through phenyl, biphenyl or naphthyl. The compound is not prone to crystallization, has good film-forming property and heat stability and has higher glass transition temperature and proper HOMO and LUMO energy levels; by means of optimization of device structure, photoelectric property of an OLED (organic light emission diode) device can be effectively improved, and the service life of the OLED device can be effectively prolonged, so that application requirements of a panel manufacturing enterprise can be met better.

The invention provides an organic micromolecular photoelectric material. The material has the following molecular structure: TP1-Ar-TP2, wherein Ar is an aromatic group, of which the structure is a structure a or structure b which is shown in a figure a or figure b respectively; * in the structure a or structure b is a position where a thiophene ring is connected with TP1 and TP2; and the TP1 and the TP2 are triphenylamine or N,N,N',N'-tetraphenyl-1,4-phenylene diamine or N,N,N',N'-tetraphenyl-1,1'-biphenyl- 4,4'-diamine. When the organic micromolecular photoelectric material provided by the invention is used as a cavity transport material of a cavity transport layer in a luminescent device, the micromolecular photoelectric material has good cavity transport capability.

An arylamine compound represented by formula (1):wherein R1 to R4 each independently represents a linear alkyl group or an arylalkenyl group, provided that when all of R1 to R4 represent linear alkyl groups, at least one of R1 to R4 represents a linear alkyl group having a carbon number of 3 or more; and an electrophotographic photoreceptor.

The invention relates to an organic electroluminescent material and an application thereof and belongs to the technical field of photoelectric materials. The general formula of the organic electroluminescent material is shown in the specification, wherein R is C6-20 straight chain or branched chain alkyl or C6-20 straight chain or branched chain alkoxyl. The organic electroluminescent material is taken as a red light material for preparing non-doped OLED apparatuses. The prepared target product can be processed in a solution form and has good voltage stability. The CIE (Coherent Infrared Energy) 1931 coordinates are close to those of an OLED standard red light material and the organic electroluminescent material is expected to be used as the OLED standard red light material.

The invention relates to a pyrene-containing organic compound and application in OLED, and belongs to the technical field of semiconductors, wherein the structure of the compound is represented by a general formula (1). The compound provided by the invention has relatively strong hole transport capability, and the hole injection and transport performance is improved under a proper HOMO energy level; under the proper LUMO energy level, the electron blocking effect is achieved, and the recombination efficiency of excitons in the light-emitting layer is improved; and when the compound is used asa functional layer material of an OLED light-emitting device, exciton utilization rate and high fluorescence radiation efficiency can be effectively improved, efficiency roll-off under high current density is reduced, device voltage is reduced, current efficiency of the device is improved, and service life of the device is prolonged.

An organic-EL device which has light emission components in three colors of red, green and blue in a good balance suited to use for a full-color display and which is capable of highly efficient and stable light emission for a long time. In the organic EL device (1) including an organic layer (4) having light emitting layers sandwiched between an anode (3) and a cathode (5), the light emitting layers include a red light emitting layer (11), a green light emitting layer (12), and a blue light emitting layer (13) laminated in this order from the side of the anode (3). The red light emitting layer (11) contains a hole transporting light emitting material and has a hole transporting property. In addition, the green light emitting layer has a positive and negative charge transporting property. Furthermore, the blue light emitting layer has an electron transporting property, and includes a positive and negative charge transporting blue light emitting layer and an electron transporting blue light emitting layer laminated in this order from the side of the anode (3).

The invention discloses an NiO-doped light-emitting diode and a preparation method therefor, and the method comprises the steps: enabling nickel salt, first doped salt and second doped salt to be mixed in deionized water or 2-methoxyethanol, adding glycine or acetylacetone, carrying out heating, and preparing LixMyNiO, wherein the first doped salt is lithium salt, and the second doped salt is magnesium salt, copper salt or zinc salt. In LixMyNiO, M is Mg, Cu or Zn, x is greater than zero but less than one, y is greater than zero but less than one. According to the invention, an LixMyNiO film is low in preparation temperature, and can be prepared under the temperature 150-200 DEG C. Moreover, a little of ammonia water is added in the preparation process of the LixMyNiO film, thereby guaranteeing the stability of precursor solution. The method improves the stability of hole transmission under the condition of guaranteeing that the work function of nickel oxide is not reduced, and reduces the hole injection barrier. The method enables the light-emitting diode to be higher in efficiency.

The invention relates to a nitrogen-containing heterocyclic compound. The heterocyclic compound has a structure shown in the following formula (1). The nitrogen-containing heterocyclic compound comprises asymmetric carboline groups and carbazole groups, so that molecules have excellent hole and electron transmission performance at the same time; meanwhile, bridged N heterocyclic rings and electron-withdrawing groups such as triazine, phenylcyano, pyrazine, pyridylcyano and the like are introduced into the molecular structure, so that improvement of the molecular electron transmission capability is facilitated. The nitrogen-containing heterocyclic compound has excellent bipolar transmission capacity, and can widen a charge composite area and reduce efficiency roll-off. Through introductionof different carboline groups and through change of relative substitution positions of carbazole groups and / or carboline groups, the energy level of the compound can be regulated and controlled, so that materials with different energy levels are screened, and selection and collocation of device materials are facilitated.

The invention relates to a pyrene-containing organic compound and application thereof, and belongs to the technical field of semiconductors, wherein structure of the compound is represented by a general formula (1). The compound provided by the invention has relatively strong hole transport capability, and the hole injection and transport performance is improved under a proper HOMO energy level; under the proper LUMO energy level, the electron blocking effect is achieved, and the recombination efficiency of excitons in the light-emitting layer is improved; and when the compound is applied to an OLED device, high film layer stability can be kept through device structure optimization, the photoelectric property of the OLED device can be effectively improved, and the service life of the OLEDdevice can be effectively prolonged.