62results about How to "Balance injection" patented technology

The invention discloses a NiO composite film and a quantum dot light-emitting device and the preparation and application thereof, which utilizes an M: NiO/NiO composite film structure, an M: NiO film layer of NiO doped by M metal and an M: NiO/NiO structure formed composite material film with NiO composition gradient composed by the NiO film layer, wherein M metal can be any metal of Li, Mg and Cu or an alloy. The M mole ratio in the M metal doped NiO film layer ranges between 1-5 mol %. The invention can not only solve the problem of hole injection, but also improves the balance of carrier injection in the device with the result being the improvement in the performance and stability of the device and the solution to the problem of short life of the existing quantum dot light-emitting device. In addition to the cathode using vacuum evaporation, all the function layers, including the inorganic hole composite layer, use the solution spin coating method for the film preparation. The materials can be obtained easily, the method is simple and the cost is low.

The invention relates to a fluorescent blue light guest material and its preparation method and use and especially relates to a triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material and its preparation method and use. The triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material solves the problem that because of large difference of an electron donor and an acceptor, when the electron donor is increased, guest emission wavelength produces red shift so that stable and efficient blue guest luminescence cannot be realized. The blue light guest material has a structural formula shown in the description. The preparation method comprises 1, preparing PXZPhBr, PXZPhBr, PTZPhBr and DMACPhBr, 2, mixing the products obtained through the step 1 and tetrahydrofuran, adding n-butyllithium and diphenylphosphinous chloride into the mixture, adding hydrogen peroxide into the mixture, carrying out stirring and carrying out chromatography and recrystallization. The triphenyl phosphorus oxide-based thermal excitation delayed fluorescent blue light guest material is used for preparation of a thermal excitation delayed fluorescent electroluminescent device. The material utilizes short-axis modification strategy, effectively keeps a matrix triplet state energy level, has a donor-acceptor (D-A)-type molecular structure and balances carrier injection and transmission. The preparation method belongs to the field of fluorescent material preparation.

The invention provides an anthracene-containing compound, a synthesis method thereof, and an organic electroluminescent device, and relates to the technical field of organic photoelectric materials. In the invention, different ligands are connected to a main structure formed by connecting anthracene and acridine, thus regulating molecular weight, [pi]-conjugation degree and electrophilicity of thematerial, enhancing charge transmission capability, balancing carrier injection and increasing glass transition temperature. The compound is not liable to crystallize and has good film forming performance. The synthesis method is simple and easy to carry out. The compound can be used for producing the organic electroluminescent device, especially as a luminescent layer main body and an electron transfer layer material in the organic electroluminescent device. The organic electroluminescent device has high luminous efficiency and long service life.

The invention discloses a triphenylamine substituted-vinyl modified phenanthroimidazole compound, a preparation method thereof and an application of the compound as an electroluminescent device. The structural general formula of the compound is shown in a formula (I), wherein R is hydrogen or phenyl. According to the invention, excellent characteristics of phenanthroimidazole materials and triphenylamine substituted-vinyl are adopted, meanwhile, a donor and a receptor are connected through the vinyl, and the pi electron ionization region can be effectively improved, so that carrier injection and transmission are more balanced, then fluorescence quantum efficiency is improved, and high-fluorescence quantum efficiency of a solid-state thin film under an aggregation state is achieved; and meanwhile, blue-green light can be efficiently emitted in an organic solvent, and organic luminescent small molecules with good carrier transmission capability and high fluorescence quantum yield under aaggregation state are synthesized. The compound provided by the invention can be used as a luminescent material to be widely applied to organic luminescent devices, in particular to the stable and efficient organic electroluminescent devices.

The embodiments of the present invention provide an organic electroluminescent device, a manufacturing method thereof and an electronic equipment. The organic electroluminescent device comprises: an anode layer, a hole transport layer, a first light emitting layer, a second light emitting layer, an electron transport layer, and a cathode layer stacked in sequence; wherein the first light emitting layer and the second light emitting layer comprise a same substrate material; the first light emitting layer and/or the second light emitting layer are doped such that a hole mobility of the first light emitting layer is equal to an electron mobility of the second light emitting layer. In the embodiments of the present invention, two light emitting layers with the same substrate material are applied, which can realize a balanced injection for electrons and holes, thereby improving the efficiency and lifetime of the organic electroluminescent device.

The invention discloses a bipolar small molecular light-emitting material based on an aromatic heterocyclo-2-S,S-dioxydibenzothiophene unit, and a preparation method and application thereof. The preparation method comprises the following step: performing Suzuki coupling reaction on an aromatic heterocyclo-2-S,S-dioxydibenzothiophene monomer and a borate monomer containing an Ar structure to obtain the bipolar small molecular light-emitting material based on an aromatic heterocyclo-2-S,S-dioxydibenzothiophene unit. The bipolar small molecular light-emitting material disclosed by the invention has solubility, film forming property and film morphology stability, also has favorable electron and hole transmission performance, and can balance carrier injection and transmission to realize effective compounding of more excitons; a light-emitting layer based on the material can avoid the phenomenon of mixing with a hole/electron transmission layer interface, thereby improving the light-emitting efficiency of a device; and the light-emitting layer based on the material dose not need to be subjected to annealing treatment during preparation of the electroluminescent device, thereby ensuring that the preparation process is simple.

The invention provides a non-PEDOT: PSS inverted series quantum dot light emitting device and a preparation method thereof. A second interface modification layer is arranged between a first hole injection layer and a second electron transport layer to form a connecting layer composite structure connected with two electroluminescent units in series. The interface modification layer is additionallyarranged between the hole injection layer of one electroluminescent unit and the electron transport layer of the other electroluminescent unit, and the hole injection layer/the interface modificationlayer/the electron transport layer form the composite connection structure serving as a connecting layer to be connected with the two electroluminescent units in series, so that the quantum dot light-emitting device is suitable for four colors of red, yellow, green and blue, and can effectively improve the light emitting efficiency, brightness and prolong the service life.

The invention discloses a white light organic electroluminescent device with a double-layer double-parent structure without a spacer layer, belonging to the technical field of organic electroluminescent devices. The device consists of a substrate, an anode, a hole transport layer, a luminescent layer, an electronic transport layer and a cathode. Between the hole transport layer and the electron transport layer, there are two dual-parent organic light-emitting layers, and the organic light-emitting dyes are doped in the dual-parent materials in the form of dopants. The dual-parent structure iscomposed of hole transport layer material and electron transport layer material. The doping ratio of hole transport layer material in the luminescent layer near the anode is larger than that in the luminescent layer near the cathode. As that luminescent lay adopts a double-layer double-parent structure without space layer, the interface potential barrier is reduced, the balance transmission of carrier and the uniform distribution of excitons in the luminescent lay are facilitated, and the high-efficiency white light emission with stable spectrum is easily realized.

The invention discloses a core-shell quantum dot, a quantum dot light emitting diode, a quantum dot composition and a display device. The core-shell quantum dot comprises a quantum dot core, a first shell layer, a second shell layer and a third shell layer, wherein the first shell layer, the second shell layer and the third shell layer sequentially coat the quantum dot core from inside to outside,the quantum dot core is made of CdZnSe, the first shell layer is made of CdZnSeS, the second shell layer is made of ZnSeS, and the third shell layer is made of CdZnS. According to the core-shell quantum dot provided by the invention, separation of a hole wave function and an electron wave function is realized, the hole wave function is limited in the quantum dot core, the electron wave function is delocalized into the third shell layer, and the hole injection capability and the electron injection capability of the core-shell quantum dot can be respectively adjusted while the emission peak isin the blue light range, so that the injection of carriers is balanced.

The invention relates to a photoelectric material and a preparation method thereof, particularly to a fluorenyl aromatic phosphine oxide photoelectric material and a preparation method thereof, and aims at solving the problem that carrier injection transmission is unbalanced caused by the fact that aromatic hydrocarbon or arylamine functional groups with large conjugated structures are introduced into a fluorine system. The method includes preparing 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine; and mixing the 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine, tetrakis (triphenylphosphine) palladium, tetrabutylammonium bromide and borate and dissolving in tetrahydrofuran, adding in NaOH solution, and obtaining the photoelectric material after reaction, extraction, drying and column chromatography; or mixing the 2-bromine-(9,9-bis-(diphenylphosphine oxide) ) fluorine, carbazole, potassium carbonate, copper iodide and 18-crown-6-ether, adding in a high-temperature solvent, and obtaining the photoelectric material after reaction, extraction, drying and column chromatography. The power efficiency of the photoelectric material prepared through the method can reach 2.19lm/W when the material is used for preparing blue-ray fluorescent devices.

The invention discloses a bis(N-phenyl)-3-carbazole substituted phenanthroimidazole compound, a preparation method thereof and application of the compound serving as an electroluminescent device. Thecompound has a molecular structure shown as a formula (I) shown in the specification. The preparation method comprises the following steps: carrying out a one-pot reaction on 4-bromobenzaldehyde, p-bromoaniline and 9,10-phenanthrenequinone to prepare 4,4-bisbromo-phenanthroimidazole; adding N-phenyl-3-carbazole boric acid, and carrying out a Suzuki reaction under the action of a catalyst tetrakis(triphenylphosphine) palladium, so as to obtain the bis(N-phenyl)-3-carbazole substituted phenanthroimidazole compound. The preparation method is simple and convenient, and large-scale batch preparation can be realized; the compound shown in the formula (I) has good carrier transport capacity, high fluorescence quantum yield in an aggregation state and high blue light color purity, and can be widely applied to organic light-emitting devices, especially stable and efficient dark blue organic light-emitting devices as a light-emitting material.

The invention belongs to the technical field of display, and particularly relates to a quantum dot light emitting diode and a preparation method thereof. A quantum dot light-emitting diode comprises an anode, a cathode and a quantum dot light-emitting layer located between the anode and the cathode; a material layer composed of organic molecules is arranged between the anode and the quantum dot light-emitting layer, and the organic molecules contain electron withdrawing groups. The material layer composed of the electron withdrawing group-containing organic molecules can reduce the hole injection barrier from the anode to the quantum dot material, thereby improving the hole injection efficiency of the device, enabling the injection of holes and electrons to be more balanced, and finally improving the performance of the device.

The invention provides a transparent OLED alloy cathode, a manufacturing method thereof and a transparent OLED device. The alloy cathode is Ag and Al alloy, the mass ratio of Ag to Al is 75-80% to 25-20%, the best thickness of the Ag and Al alloy is 75 nm, and Ag and Al adopt a vacuum melting method to be melted in a quartz glass tube in a vacuum condition and are naturally cooled to form the alloy. The Ag and Al alloy cathode of the invention can improve the electron injection capability of the cathode, the performance is better than a single metal cathode OLED device, and the cathode can be applied to the transparent OLED; and the Ag and Al alloy can be evaporated through only one tungsten boat, while the operation difficulty is reduced, the film thickness is easier to be controlled, and the device structure is optimized.

The invention belongs to the field of photoelectric devices, and discloses a rare earth electrogenerated dark blue light device. The device sequentially comprises a top electrode, an electron transport layer, a light emitting layer, a hole transport layer and a bottom electrode from top to bottom, wherein the light emitting layer is made of an Eu-based perovskite type material, and in the Eu-basedperovskite type material, an Eu element occupies a B site in a perovskite ABX3 structure and does not contain Pb; the electron transport layer and the hole transport layer are used for localizing electrons or holes in the light-emitting layer and adjusting injection balance of the electrons and the holes. According to the invention, the Eu-based perovskite type material (such as CsEuBr3) is usedas a luminescent layer material to construct the rare earth electrogenerated dark blue light device, and the material is an inorganic material, so that the material is good in stability, not easy to age and long in service life, the existing display color gamut can be widened, and the technical problems of poor OLED stability, easy aging and easy blue light color distortion are solved.

The invention belongs to the technical field of electroluminescence materials, and discloses a heterocyclic nitrogen containing organic light-emitting material and application thereof. The heterocyclic nitrogen containing organic light-emitting material is characterized in that pyridine indole carboline is used as a main unit and is combined with other aromatic heterocycte with power supplying orbearing capacity, so that electric charge injection can be more balanced; the material is high in stability; in addition, the component is outstanding in solubleness, and easy to sublimate and process.

The invention discloses a bipolar small-molecular luminescent material based on a heteroaromatic ring-fused-3-S,S-dioxodibenzothiophene unit, and a preparation method and an application thereof. Through a Suzuki coupling reaction, electron donor units are connected to two sides of the heteroaromatic ring-fused-3-S,S-dioxodibenzothiophene unit to prepare the luminescent material. The bipolar small-molecular luminescent material has good solubility, film-forming property and thin film morphological stability and also has excellent electron and hole transport performances, so that the material can balance injection and transportation of carriers, more electrons and holes are effectively compounded to generate excitons, and a mixing phenomenon with the transportation layer interface between the electrons and the holes, thereby improving luminescent efficiency of a device. A luminous layer, based on the material, is free of annealing treatment during preparation of electroluminescent devices, so that the production process is simple.

The invention discloses a bipolar fluorescent material based on benzo five-membered heterocycle, a preparation method thereof and an organic electroluminescent device, the bipolar fluorescent material has the following structure: or in the structure, X and Y are independently selected from oxygen, sulfur, selenium, tellurium or nitrogen alkyl; R1-R4 are independently selected from hydrogen, deuterium or an alkyl chain; EG1-EG4 is an electrical group, and at least two of the EG1-EG4 are respectively selected from a fluorophore and an auxiliary group with polarity balanced with that of the fluorophore and are independently selected from hydrogen, deuterium or an alkyl chain. By introducing the auxiliary polar group, the unipolar characteristic of the material can be effectively improved, and charge injection is balanced. In addition, on the premise that the structure of a light-emitting area is not affected basically, the material structure is twisted, the material stacking effect is weakened, the aggregation quenching effect of a phosphor is reduced, the device stability and the adaptive doping concentration are improved, and regulation and control and yield improvement in the large-scale production process are facilitated.

The invention discloses an inverted electroluminescent device, a preparation method thereof and a display device, an electron transport material comprises a cathode and an insulating layer adjacent to the cathode, and on an electron transport path, the insulating layer is located at the downstream of the cathode. According to the inverted electroluminescent device provided by the invention, the insulating layer is inserted between the cathode and the electron transmission layer, so that the energy level is bent, the tunneling injection probability of electrons is improved, the injection of the electrons and holes is more balanced, and the performance of the electroluminescent device is effectively improved.