113results about How to "Reduced efficiency roll-off" patented technology

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises an organic luminescent layer; the organic luminescent layer comprisesa main body material, a sensitizing agent material and a resonance thermally activated delayed fluorescence (TADF) material; the main body material is a broad-band gap material; the sensitizing agentmaterial is a thermally activated delayed fluorescence material; a singlet-state energy level of the thermally activated delayed fluorescence material is located between a singlet-state energy level of the broad-band gap material and a singlet-state energy level of the resonance thermally activated delayed fluorescence material; and a triplet-state energy level of the thermally activated delayed fluorescence material is located between a triplet-state energy level of the broad-band gap material and a triplet-state energy level of the resonance thermally activated delayed fluorescence material.With the organic electroluminescent device and the display device, the defects of short life time and wide spectrum of the device caused by a condition that the traditional TADF material is adopted to emit light at the present stage can be overcome.

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 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 belongs to the technical field of OLED, and provides a compound used as a host material. The compound has a structure as shown in a formula (I) which is described in the specification. In the formula (I), X is selected from the group consisting of C, O, S, Se, Si and Te atoms; a and b respectively represent the number of an electron donor D and an electron acceptor A and are respectively selected from the group consisting of 1, 2 and 3; c and d are respectively selected from the group consisting of 0, 1 and 2; L1, L2 and the electron donor D are respectively and independently selected from the group consisting of an alkyl group, a cycloalkyl group, a heterocyclic group, an aryl group, a heteroaryl group, a fused aryl group and a fused heteroaryl group; and the electrozxn acceptor A is selected from the group consisting of an azacycle-containing substituent, a cyano-containing substituent, a phosphoxy-containing substituent and a triaryl boron substituent. The compound provided by the invention has a D-(pi)-sigma-(pi)-A structure with bipolarity, and a sigma bond can effectively interrupt the intramolecular charge transfer between the electron donor D and the electronacceptor A, and limits an excited state to be a local excited state in a segment of D or A, so the compound has a dipole moment with a small excited state; and when the compound is used as the host material of a luminescent layer, the compound can effectively reduce the efficiency roll-off of a blue light material and improves luminescent brightness and luminescent efficiency.

The invention relates to a novel iridium complex taking heterocyclic nitrogen as a main ligand and taking a thiobis diaryl/aromatic heterophosphamide compound as an auxiliary ligand. The heterocyclicnitrogen and phosphorus-sulfur groups in iridium complex molecules are helpful for increasing the electron mobility of a material and regulating the luminescence color, injection and transmission of cavity and electrons can be balanced, a composite area of a carrier is widened, the equipment efficiency is increased, and the efficiency roll-off is reduced. The iridium complex has the advantages ofsimple synthesis, stable chemical properties, easy sublimation purification, and excellent equipment performance, and provides convenience for acquiring a high-efficiency organic electroluminescent device and an application of the high-efficiency organic electroluminescent device in the fields of illumination and display.

The invention discloses an organic light-emitting display device. The organic light-emitting display device includes a first conducting layer, a second conducting layer, a hole transport part and an electron transport part which are formed between the first conducting layer and the second conducting layer and a luminous layer formed between the hole transport part and the electron transport part, and is characterized in that the luminous layer includes n+1 layers of luminous sublayers and intermediate barrier layers formed between two adjacent luminous sublayers, and at least one of the luminous sublayers is formed by doping a metal auxiliary delayed fluorescent sensitizer, a host material and a fluorescent guest material, wherein n is a natural number larger than or equal to 1. The organic light-emitting display device provided by the invention can transfer 100% of exciton energy to the fluorescent guest material to perform fluorescence radiation, thereby improving the luminous efficiency.

The invention requests and protects a dual-light emitting layer structure blue-light OLED device and a manufacturing process thereof. The device comprises a positive electrode substrate, a hole injection layer, a hole transmission layer, a first light-emitting layer, a second light-emitting layer, an electronic transmission layer, an electronic injection layer and a negative electrode, wherein the first light-emitting layer and the second light-emitting layer employ the same main body materials, same object material and same thickness, and the object doping concentration of the first light-emitting layer is not higher than 50% of the object doping concentration of the second light-emitting layer. The dual-light emitting layer structure provided by the technical scheme is simple, the exciton utilization rate and the composite region can be expanded, and the efficiency roll-off of the device is effectively improved.

The invention belongs to the field of display technologies and particularly discloses an organic electroluminescent device. The organic electroluminescent device comprises a light-emitting layer, wherein the light-emitting layer comprises an exciplex consisting of donor molecules and receptor molecules and a broad-band-gap material used for increasing the spacing between the donor molecules and the receptor molecules. Through the organic electroluminescent device, the HOMO and LUMO track overlapping degree of the formed exciplex can be lowered, singlet-triplet energy level difference is reduced, the reverse intersystem crossing rate (kRISC) of an exciplex body is increased, energy transmission to guest molecules is enhanced, and the efficiency of the device is improved; and meanwhile, by introducing the broad-band-gap material, the concentration of triplet excitons in the light-emitting layer can be effectively lowered, triplet-triplet annihilation (TTA) and triplet-polaron annihilation (TPA) are suppressed, efficiency roll-off is lowered, and the life of the device is prolonged.

The invention relates to a novel iridium complex taking heterocyclic nitrogen as a main ligand and taking a dithiolyl ring/aromatic heterocyclic phosphate compound as an auxiliary ligand. The heterocyclic nitrogen and phosphorus-sulfur groups in iridium complex molecules are helpful for increasing the electron mobility of a material and regulating the luminescence color, injection and transmissionof cavity and electrons can be balanced, a composite area of a carrier is widened, the equipment efficiency is increased, and the efficiency roll-off is reduced. The iridium complex has the advantages of simple synthesis, stable chemical properties, easy sublimation purification, and excellent equipment performance, and provides convenience for acquiring a high-efficiency organic electroluminescent device and an application of the high-efficiency organic electroluminescent device in the fields of illumination and display.

The invention discloses an anthraquinone general formula compound and application thereof. The general formula compound is shown in a formula in the specification, in the formula, Y represents an oxygen atom or a sulfur atom, X1 to X8 represent C, CR or N, when any one or any two of X1 to X8 represent C, the C atom is connected with L, R is selected from a hydrogen atom, alkyls of C1 to C10, substituted or unsubstituted aryls of C6 to C30, or substituted or unsubstituted heteroaryl groups of C3 to C30, adjacent R can form a ring, L is selected from substituted or unsubstituted heterocyclic arylenes of C3 to C12, Ar is selected from substituted or unsubstituted aryls of C6 to C30 or substituted or unsubstituted heteroaryl groups of C3 to C30, n is an integer of 1 to 2, and when n is 2, twoL groups in the formula are the same or different, and two Ar groups are the same or different. When serving as a light-emitting material in an organic light-emitting device (OLED), the compound showsexcellent device performance and stability; and meanwhile, the OLED made of the general formula compound is within the scope of patent right.

The invention provides a compound and application thereof, and an organic electroluminescent device comprising the same, the compound has a structure of formula (I), and the compound is used as a material of a luminescent layer in the organic electroluminescent device; and the organic electroluminescent device comprises a first electrode, a second electrode and an organic layer between the first electrode and the second electrode, and the organic layer contains any one or a combination of at least two of the compounds. The compound provided by the invention can further reduce the efficiency roll-off of the device and prolong the service life of the device on the premise of ensuring proper driving voltage.

The invention relates to a novel iridium complex taking heterocyclic nitrogen as a main ligand and taking a sulfo aromatic ring/aromatic heterocyclic phosphate compound as an auxiliary ligand. The heterocyclic nitrogen and phosphorus-sulfur groups in iridium complex molecules are helpful for increasing the electron mobility of a material and regulating the luminescence color, injection and transmission of cavity and electrons can be balanced, a composite area of a carrier is widened, the equipment efficiency is increased, and the efficiency roll-off is reduced. The iridium complex has the advantages of simple synthesis, stable chemical properties, easy sublimation purification, and excellent equipment performance, and provides convenience for acquiring a high-efficiency organic electroluminescent device and an application of the high-efficiency organic electroluminescent device in the fields of illumination and display.

The invention discloses an aromatic amine derivative containing a benzophenone groupand a preparation method and application thereof. The aromatic amine derivative containing the benzophenone group provided by the invention has a unique triphenylamine group and the benzophenone group, has TICT and AIE effects, high luminous intensity and good hole transport ability, and can be used as a novel soluble light-emitting molecule which is good in performance, low in cost and highly distorted in space structure. The aromatic amine derivative can be widely applied to the fields of color display and solid-state lighting, and is used for preparing a luminescent material, a luminescent device or an intelligent material; when thearomatic amine derivative is used as OLED, the aromatic amine derivative containing the benzophenone group is taken as a host material and a phosphorescent material is taken as a guest material, so that the concentration quenching of the phosphorescent material can be reduced, the external quantum efficiency of the device is improved, and efficiency roll-off is reduced.