212 results about "Triplet exciton" patented technology

A high-efficiency, high-durability organic electroluminescent device, particularly a phosphorescent organic electroluminescent device is provided by using an organic compound of excellent characteristics that exhibits excellent hole-injecting/transporting performance and has high triplet exciton confining capability with an electron blocking ability, and that has high stability in the thin-film state and high luminous efficiency.

The organic electroluminescent device includes a pair of electrodes, and a plurality of organic layers sandwiched between the pair of electrodes and including a phosphorescent light-emitting material-containing light emitting layer and a hole transport layer, wherein a compound of the following general formula (1) having a carbazole ring structure is used as a constituent material of the hole transport layer.

An object is to improve luminous efficiency of a light emitting element using triplet exciton energy effectively. Another object is to reduce power consumption of a light emitting element, a light emitting device, and an electronic device. Triplet exciton energy generated in a light emitting layer which exhibits short wavelength fluorescence can be effectively utilized by use of a structure in which the light emitting layers which exhibit short wavelength fluorescence are sandwiched between light emitting layers each including a phosphorescent compound. Further, the emission balance can be improved between the light emitting layer including a phosphorescent compound and the light emitting layer which exhibits fluorescence by the devising of the structure of the light emitting layer which exhibits fluorescence.

The invention relates to a photoactive device with organic layers, especially a solar cell, with a layer arrangement having an electrode and a counterelectrode as well as a sequence of organic layers arranged between the electrode and the counterelectrode, wherein two layers bordering on one another are formed in a photoactive region encompassed by the sequence of organic layers, namely, an exciton-harvesting layer (EHL) and an exciton-separating layer (ESL); in which the exciton-harvesting layer (EHL) is a mixed layer containing an organic material (A) and at least one further organic material (B), in which (i) a lowest singlet excitation state for excitons (S₁^A) of the organic material (A) is energetically higher than a lowest singlet excitation state for excitons (S₁^B) of the further organic material (B), (ii) the further organic material (B) is chosen such that it transforms singlet excitons into triplet excitons with a quantum yield of at least approximately 20%, preferably of at least approximately 50% by an ISC mechanism (ISC—Inter-System-Crossing), and (iii) a lowest triplet excitation state for excitons (T₁^B) of the further organic material (B) is energetically higher than a lowest triplet excitation state for excitons (T₁^A) of the organic material (A); and wherein a donor-acceptor heterojunction is formed between the exciton-harvesting layer (EHL) and the exciton-separating layer (ESL) converting triplet excitons of the organic material (A) into free charge carrier pairs in the vicinity of the interface.

The invention provides an organic electroluminecent device including an organic compound layer provided between a pair of electrodes. The organic compound layer has at least a luminescent layer. The luminescent layer has at least a metal complex containing a tri- or higher-dentate ligand and plumality of host compounds. The metal complex is preferably a metal complex capable of obtaining light emission from a triplet exciton. The ligand of the metal complex is preferably chained or cyclic. Further, an ionization potential of the metal complex is preferably larger than a minimum value out of ionization potentials of the plurality of host compounds.

A white organic light emitting device which has high color temperature characteristics and no change in color coordinates according to luminance change, includes a first electrode and a second electrode opposite to each other on a substrate, a charge generation layer formed between the first electrode and the second electrode, a second stack including a second light emitting layer formed between the charge generation layer and the second electrode, and a first stack including a first light emitting layer formed between the first electrode and the charge generation layer, wherein the first emitting layer has low singlet-triplet exchange energy to change triplet excitons into a singlet state by triplet-triplet annihilation and a dopant concentration of the first light emitting layer is adjusted according to a luminance change curve of the second stack.

Provided are a hybrid white organic light emitting diode (OLED) and a method of fabricating the same. A HOMO level difference between a fluorescent emission layer and an electron transport layer in an organic emission layer (OLED) becomes higher than that between the other layers or a LUMO level difference between a fluorescent emission layer and a hole transport layer is higher than that between the other layers, so that a recombination region is restricted to a part of an emission layer to obtain high-efficiency fluorescent light emission. In addition, triplet excitons that are not used in a fluorescent emission layer are transferred to an auxiliary emission layer formed to be spaced apart from a recombination region by a predetermined distance to emit light in a different color from the fluorescent emission layer, so that both singlet and triplet excitons formed in the OLED are used to obtain high-efficiency white light emission.

The invention discloses a quantum dot electroluminescent device, which comprises a light emitting layer. The light emitting layer comprises a quantum dot material and a thermally-activated delayed fluorescence (TADF) material; and after the luminescent spectrum of the thermally-activated delayed fluorescence material and the absorption spectrum of the quantum dot material are subjected to normalization, the difference of wavelengths corresponding to wave crests is within 50 nm. The TADF material in the light emitting layer of the quantum dot electroluminescent device can effectively convert triplet excitons to singlet excitons, the singlet excitons are then transmitted to quantum dots through Forster fluorescence resonance energy transfer, the quantum dots are excited to emit light, and the current efficiency of the quantum dot electroluminescent device is thus improved.

The present invention discloses phosphorescence iridium complex and an organic electroluminescent apparatus thereof. The phosphorescence iridium complex of the present invention is that 1-phenyl phthalizine derivative is used as a ligand for the complexation of iridium metal ion, the structure of which is as a formula (I). The phosphorescence iridium complex of the present invention contains 1-phenyl phthalizine group, which not only can adjust the size of the conjugated system of the ligand to obtain the satisfying energy transmission efficiency, luminescent light wave and luminescence life, but also can produce certain space effect, so as to reduce the direction effect among complex luminescent centers, reduce the self quenching phenomenon of triple-state exciton and improve the luminescent performance of material. At the same time, the complex has high synthesis yield, easy purification, good solubility and high stability, is in favor of vapor plating and can increase the film-forming performance and improve the stability of the apparatus. The electroluminescent apparatus which is manufactured by the phosphorescence iridium complex has very high internal and external quanta yield, luminescent brightness and stability.

A photovoltaic device has a first electrode, a second electrode spaced apart from the first electrode, and a layer of light responsive material disposed between the first electrode and the second electrode. The layer of light responsive material includes a material that has a triplet exciton state which can be excited by incident electromagnetic radiation to provide collectable free charged particles at one of the first and second electrodes.

An object of the present invention is to provide a host compound in an emission layer, which has a high excited triplet level and completely confines triplet excitons of an phosphorescence-emitting substance. The invention relates to a compound containing an m-carbazolylphenyl group, which is represented by the following general formula (1):

wherein A represents a nitrogen atom, an amino group to which a substituted or unsubstituted aromatic hydrocarbon group is bonded, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group; n represents an integer of 2 to 4; R¹ and R² may be the same or different and represent each an arbitrary substituent; and m and o represent each an integer of 0 to 4.

A hybrid white light organic electroluminescence device comprises a base plate, an anode, a cathode and an organic functional layer, wherein the organic functional layer is arranged between the anode and the cathode and provided with at least one blue fluorescent layer, at least one phosphorescence light emitting layer which forms a complementary color of the blue light, and at least one charge generation layer; the device also comprises at least one group of a spacer structure wherein the blue fluorescent layer and the phosphorescence light emitting layer are spaced by a charge generation layer; the triplet state energy level of at least one of the blue fluorescent layers is higher than the triplet state energy level of at least one of the phosphorescence light emitting layers. According to the hybrid white light organic electroluminescence device, the triplet state energy level of the blue fluorescent layers is higher than the triplet state energy level of the phosphorescence light emitting layers; singlet excitons and triplet excitons of the device can be effectively used; and the charge generation layer spacing design is adopted so that the hybrid white light organic electroluminescence device has advantages such as high efficiency, long service life, and good stability.

An organic electroluminescent device comprising: a pair of electrodes; and at least one organic layer between the pair of electrodes, the at least one organic layer between the pair of electrodes, the at least one organic layer including a luminescent layer, wherein the luminescent layer contains at least one electron injection/transport compound, at least one hole injection/transport compound, and at least one green or blue phosphorescent compound; and the electron injection/transport compound and the hole injection/transport compound each has a minimum triplet exciton energy value which is equal to or more than that of the green or blue phosphorescent compound.

The invention provides a light emitting layer host compound and an electron-blocking compound that have high excited triplet levels, and can completely confine the triplet excitons of phosphorescent material, for use as the material of a high-efficient organic electroluminescent device. The invention also provides a high-efficient, high-luminance organic electroluminescent device with the use of the compounds.

The compound of the general formula (1) below has a triphenylsilyl group and a triarylamine structure, and the organic electroluminescent device includes a pair of electrodes and at least one organic layer interposed between the pair of electrodes, wherein the compound of the general formula (1) having a triphenylsilyl group and a triarylamine structure is used as constituent material of the at least one organic layer.

The present invention generally relates to composition and methods for downconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the organic material and the nanocrystal. In certain embodiments, the nanocrystal has a first excited energy state with an energy less than a triplet energy state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the organic material to produce two triplet excitons. The triplet excitons may then transfer to the nanocrystal via the ligand, where they can undergo recombination, resulting in the formation low energy photons.

The invention provides a composite film and an organic light-emitting diode which is based on the composite film. The composite film has double excitor blocking capability, and is composed of an all-inorganic colloidal perovskite and an organic current carrier transmission micromolecule material, wherein the all-inorganic colloidal perovskite film and the organic micromolecule material can be prepared through spin-coating, vapor deposition, ink jet printing, Knife Coating, chemical vapor deposition method and the like methods. The composite film can better block singlet excitons and triplet excitons. The composite film serves as a hole transport layer in an organic light-emitting diode, has excellent photoelectric properties, and has higher electroluminescence efficiency than devices which have traditional organic micromolecules as the hole transport layer.

The invention relates to the field of photoelectric technological materials, and specifically relates to a single white light polymer and an organic light-emitting material, and an organic light-emitting device and a preparation method of the organic light-emitting device. The single white light polymer is capable of emitting blue and orange thermal activation delayed fluorescence at the same time. The organic light-emitting material is capable of realizing the situation of upwards converting triplet excitons into singlet excitons, triplet exciton quenching caused by concentration in an emission layer is reduced.

The invention belongs to the field of organic photoelectricity, and particularly relates to an organic compound and an organic photoelectric element containing the organic compound, in particular to an organic light-emitting diode. The structure of the organic compounds is shown in the formula (I). The organic compound group shown in the formula (I) has a remarkable characteristic that the difference value between the singlet state energy level S1 and the triplet state energy level T1 of the organic compounds is smaller than or equal to 0.35 electron volt. Detailed description information and the organic photoelectric element thereof can be understood by referring to the specific description provided by the invention. The organic compound provided by the invention has the characteristic of thermal activation delayed fluorescence, can improve the utilization efficiency of triplet excitons when being applied to an organic electroluminescent diode, and particularly can improve the current efficiency, reduce the driving voltage and obviously prolong the service life of a light-emitting element when being used as a functional layer of the light-emitting element, and good commercialization prospects are realized.

Embodiments of the invention pertain to the use of alloyed semiconductor nanocrystals for use in solar cells. The use of alloyed semiconductor nanocrystals offers materials that have a flexible stoichiometry. The alloyed semiconductor may be a ternary semiconductor alloy, such as A_xB_1-xC or AB_1-yC_y, or a quaternary semiconductor alloy, such as A_xB_yC_1-x-yD, A_xB_1-xC_yD_1-y or AB_xC_yD_1-x-y (where A, B, C, and D are different elements). In general, alloys with more than four elements can be used as well, although it can be much harder to control the synthesis and quality of such materials. Embodiments of the invention pertain to solar cells having a layer incorporating two or more organic materials such that percolated paths for one or both molecular species are created. Specific embodiments of the invention pertain to a method for fabricating nanostructured bulk heterojunction that facilitates both efficient exciton diffusion and charge transport. Embodiments of the subject invention pertain to a solar cell having an architecture that allows for efficient harvesting of solar energy. The organic solar cell architecture can incorporate a host/guest (or matrix/dopant) material system that utilizes the long diffusion lengths for triplet excitons without compromising light absorption efficiency.

An organic light emitting display device is discussed. The organic light emitting display device in one embodiment includes at least one light emitting layer between an anode and a cathode, and an electron transport layer between the at least one light emitting layer and the cathode. The electron transport layer may include a first electron transport material for blocking holes from the light emitting layer to the electron transport layer, and a second electron transport material for assisting in a transfer of electrons to the light emitting layer, wherein the first electron transport material and the second electron transport material have different triplet exciton energy levels and different electron mobilities.

The invention belongs to the fields of preparation and application sciences of organic photoelectric materials and specifically relates to a luminescent material with thermotropic delayed fluorescence, an application of the luminescent material and an electroluminescent device. The luminescent material with thermotropic delayed fluorescence, provided by the invention takes a carbazole derivative as a donor group, and a relatively small tripletenergy gap is achieved by molecular distortion, so that the reverse intersystem crossing from triplet excisions to singlet excisions is realized, and theutilization ratio of the excisions and the efficiency of the device are increased. By taking the luminescent material with thermotropic delayed fluorescence, provided by the invention, as a main luminescent material, the efficiency roll-off of the device can be reduced; and serving as an object luminescent material, the luminescent material with thermotropic delayed fluorescence is high in luminescent layer brightness, good in stability, high in luminescent efficiency and long in service life. If the luminescent material with thermotropic delayed fluorescence is used as an organic luminescentmedium, the device is reduced in efficiency roll-off, high in luminescent efficiency and long in service life.

The invention provides a compound, a display panel and a display device. The compound has the structure shown in formula (I), L represents substituted or unsubstituted phenyl, naphthyl, pyridyl, pyrimidinyl and pyrazinyl; D is an electron-donating group and independently selected from any one of substituted or unsubstituted phenyl, biphenyl, naphthyl, anthryl, phenanthryl, acenaphthylene, pyrenyl,peryl, flurenyl, spiro bifluorenyl, benzophenanthryl, benzanthracene, fluoranthryl, picene, furyl, benzofuryl, dibenzofuryl, thienyl, benzothienyl, dibenzothienyl, phenoxazine, thianthryl, carbazolyl, acridinyl and diarylamino. The designed compound has a TADF characteristic and can emit light by triplet exciton of traditional fluorescence molecular transition inhibition so as to improve the device efficiency.