47 results about "Triplet triplet annihilation" patented technology

This invention discloses a novel multicomponent system or a single compound that is capable of performing triplet-triplet annihilation up conversion process. (TTA-UC) A solution or solid film that comprises this TTA-UC system or compound is provided. This system or compound can be used in an optical or optoelectronic device.

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.

The invention provides an organic electroluminescent device and a preparation method and a display device thereof. The organic electroluminescent device comprises a luminescent layer; the luminescentlayer comprises a host material and a dye; the host material is a triplet-triplet annihilation material; the dye comprises a thermally activated delayed fluorescent material; the singlet state energylevel of the triplet-triplet annihilation material is greater than the singlet state energy level of the thermally activated delayed fluorescent material; and the triplet state energy level of the triplet-triplet annihilation material is less than the triplet state energy level of the thermally activated delayed fluorescent material. According to the organic electroluminescent device provided by the invention, the defect that the service life of the device is short due to high-energy excitons in the device at the present stage can be overcome.

Provided is a light-emitting element with high emission efficiency including a fluorescent material as a light-emitting substance. In a light-emitting element including a pair of electrodes and an EL layer between the pair of electrodes, a delayed fluorescence component due to triplet-triplet annihilation accounts for 20% or more of light emitted from the EL layer, and the light has at least one emission spectrum peak in the blue wavelength range. The EL layer includes an organic compound in which an energy difference between the lowest singlet excited energy level and the lowest triplet excited energy level is 0.5 eV or more. The EL layer includes a benzo[a]anthracene compound.

The invention relates to a preparation method of an up-conversion luminescent material based on triplet-triplet annihilation and application of the material to a light-catalyzed reaction. The up-conversion luminescent material comprises a triplet photosensitizer, an energy receptor and a high-molecular polymer, wherein the molar ratio of the triplet photosensitizer to the energy receptor is 1 to (50-1) to 250. The triplet photosensitizer can be used for achieving strong absorption of visible spectrum, and visible light is converted into ultraviolet light by virtue of a triplet-triplet annihilation process, so that the utilization rate of sunlight is effectively increased and the light degradation efficiency of organic matters in water is improved.

The invention relates to a dibenzothiophene-based aromatic phosphine oxide compound and a preparation method and application thereof. The invention solves the problems that an electrophosphorescent device has low efficiency and low brightness because the conventional electrophosphorescent material has serious concentration quenching and triplet-triplet annihilation effects. The structural general formula of the compound is that: X is H or a diphenylphosphine oxide group. The compound is obtained by the steps of: preparing a derivative from dibenzothiophene, n-butyllithium, tetramethylethylenediamine and diphenylchlorophosphine, dissolving the derivative into CH2Cl2, adding H2O2 and reacting. The invention also relates to application of the compound to organic electroluminescent light-emitting diode devices and application of the compound used as a main material of a luminescent layer. An electroluminescent blue-light and green-light main material with high triplet excited-state energy level and good carrier injection and transmission capacity is obtained by modifying the diphenylphosphine oxide group onto a chromophore parent through a C-P saturated bond; and the prepared device has high turn-on voltage, brightness and efficiency stability.

The invention relates to an annihilation agent applied to a triplet-triplet annihilation up-conversion system, and a preparation method and an application method thereof. The annihilation agent is 9,10-difluorenyl anthracene. The preparation method includes: generating an intermediate product by using Suzuki reaction, and then substituting 9, 10 positions of anthracene with the intermediate product by using carbanion reaction. A photosensitizer of the annihilation agent on the triplet-triplet annihilation up-conversion system is a metalloporphyrin compound: octaethylporphyrin palladium. The up-conversion system converts green light of 532nm into blue light of 440nm, and conversation rate of the up-conversion system is 5.86%. The disclosed small organic molecule annihilation agent material easy to prepare and efficient and stable is prepared through raw material easy and simple to obtain, uses the preparation process simple and free from pollution, conforms to development requirements of green chemistry, and is suitable for industrial mass production.

Transmission of low energy light is one of the primary loss mechanisms of a single junction solar cell. Molecular photon upconversion via triplet-triplet annihilation (TTA-UC)—combining two or more low energy photons to generate a higher energy excited state—is an intriguing strategy to surpass this limit. The present disclosure is directed to self-assembled multilayers, e.g., bi- or trilayers, on metal oxide surfaces as a strategy to facilitate TTA-UC emission and demonstrate direct charge separation of the upconverted state. A three-fold enhancement in transient photocurrent is achieved at light intensities as low as two equivalent suns. The multilayer structure comprises a substrate comprising a metal oxide surface and a bulk region, and a self-assembled bilayer film, the bilayer film comprising: (a) an acceptor molecule covalently bonded to the metal oxide surface; (b) a linking metal ion bonded to the acceptor molecule; and (c) one or more sensitizer molecule(s) bonded to the linking co-ordinating metal ion.

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 discloses a dendritic polymer structure based triplet-triplet annihilation upconversion luminescent material, and relates to the technical field of photon upconversion. The upconversion luminescent material comprises a dendrite structure based annihilation agent formed by covalent modification of 9, 10-diphenylanthracene (DPA) on the periphery of an aromatic ether dendrite polymer. The upconversion luminescent material provided by the invention can realize the upconversion luminescence under the condition of low excitation light power density in a solution and solid, and is a novel upconversion luminescent material.

This invention pertains to organo-metallic complexes for opto-electronic and sensory devices and their use in such opto-electronic and sensory devices. The organo-metallic complex (triplet emitter) of the invention consists of a metal center and chelate ligands. At least one of these chelate ligands comprises an aromatic or fused aromatic ring(s). Each of these ligands is covalently substituted with at least one, preferably two charge transport groups (ctg). The metal center can additionally be coordinated by a spectator ligand. The presence of two ctgs at each ligand results in distinct advantages - in particular for applications in organic light emitting diodes (OLEDs) - compared to complexes known in the state of the art: - The charge transport units facilitate hole and / or electron transport to the molecular center and allow for efficient exciton formation directly on the emitter complex. - The presence of the ctgs on each ligand provides a good shielding with respect to interactions to the environment. Thus, emission quenching is strongly reduced and materials with high emission quantum yields are obtained. - The presence of the ctgs on each ligand increases the separations between the emitting cores of different molecules and thus reduces undesired quenching by triplet-triplet annihilation or self-quenching effects. - The complexes of the invention are highly soluble in many organic solvents and thus are well suited for wet-chemical processing.

The invention provides a triplet acceptor material with up-conversion circularly polarized luminescence and a preparation method and application thereof. The triplet acceptor material comprises a chiral structure compound as shown in a formula I or a formula II in the specification. The material has a chiral structure and contains an acene structure in the structure, so that the material can be used as an energy acceptor of a triplet annihilation up-conversion system, and can be matched with an energy donor to achieve the targets of photon up-conversion and emission of circularly polarized light. The triplet acceptor material has great application value in the aspects of chiral photocatalysis, biological imaging, and processing, displaying and storage of optical information.

Provided is a light conversion element solving problems of conventional light conversion elements, such as combustibility of the medium, volatility, and decreased upconversion light intensity caused by high viscosity of the medium. The problems are solved by using a light conversion element which appears homogenous and transparent when observed visually, composed by melting and / or dispersing in an ion liquid a combination of organic photosensitizer molecules and organic light-emitting molecules exhibiting a triplet-triplet annihilation process.

The invention provides a method for removing oxygen through photochemistry to protect triplet excited state of a photosensitizer and application thereof. The method comprises the following steps: adding the photosensitizer into a solvent, and irradiating a solvent containing the photosensitizer by using exciting light. Through the method, the solvent does not need to be subjected to oxygen removalmeasures such as bubbling through inert gas and the like; the oxygen in the solvent can be removed by directly irradiating the solvent containing the photosensitizer under the air condition; phosphorous light is gradually intensified in the solvent; the invention also relates to the application of the method to photoetching through gel and implementation of triplet state-triplet state annihilation photon up-conversion under the air condition.

The invention belongs to the field of photoelectric devices, and discloses a hemispherical shell organic electroluminescence device with two luminescent layers and a preparation method for the device. The hemispherical shell organic electroluminescence device with the two luminescent layers comprises a hemispherical shell base, wherein an anode layer, a p-type doped hole transport layer, an electron blocking layer, a blue luminescent layer, a green luminescent layer, a hole blocking layer, an n-type doped electron transport layer and a cathode layer are stacked on the internal surface of the hemispherical shell base in sequence. The hemispherical shell organic electroluminescence device is provided with the two luminescent layers with a subject and object doped structure, and a subject material is a bipolar subject material or a mixed material of hole transport and electron transport subject materials, so that the impact recombination zone of excitons can be expanded, triplet-triplet annihilation is avoided, and the starting voltage of the organic electroluminescence device is reduced.

There is provided an optical wavelength conversion element with a good temporal stability and such a high optical wavelength conversion efficiency that the element is viable even under sunlight or similar, low intensity light. Owing to these properties, the element is suited for use in solar cells, photocatalysts, photocatalytic hydrogen and oxygen generating devices, photon upconversion filters, and like articles. The optical wavelength conversion element is visually homogeneous and transparent and produced by dissolving and / or dispersing in an ionic liquid (C) a combination of organic photosensitizing molecules (A) and organic light-emitting molecules (B) that exhibits triplet-triplet annihilation. When the ionic liquid (C) is washed with a volume of ultrapure water that is 9 times as much as the volume of the ionic liquid (C), the water resulting from the washing has a pH larger than 5.

The invention belongs to the field of temperature sensing and specifically provides a temperature monitoring material based on triplet-triplet annihilation up-conversion luminescence. The material comprises a temperature sensitivity response part and a temperature calibration part. The temperature sensitivity response part is based on a triplet-triplet annihilation up-conversion luminescence system and mainly comprises a sensitizer and an annihilation agent. The temperature calibration part mainly comprises a reference system. Light-emitting signals of the triplet-triplet annihilation up-conversion luminescence system are enhanced with the rise of temperature and light-emitting signals of the reference system are weakened or kept the same with the rise of temperature , so that a temperature change process of a biological body can be dynamically monitored based on the ratio value of the two light-emitting signals through real-time measurement of the light-emitting signals. The application of up-conversion light-emitting materials to temperature monitoring, imaging, physiological medical research in cells or biological bodies can be promoted.

The invention belongs to the technical field of organic photoelectric materials, and concretely relates to synthesis and application of porphyrin metal complexes with different frameworks. The complexes are obtained through coordination of porphyrin rings with different structures and a metal, and the structure general formula is shown in the specification. A porphyrin compound is synthesized from pyrrole, pentafluorobenzaldehyde and trimethylsilylacetylene, and then porphyrin complexes are formed through coordination of the porphyrin compound and different metals. TTA (triplet-triplet annihilation) transition phenomenon is generated when the prepared target metal complex is combined with an acceptor, and the metal complexes have good application prospects on solar cells and cell imaging. Additionally, the porphyrin metal complexes can generate single oxygen quantum dot with extremely high efficiency, and possesses potential application prospect on anoxia detection and photodynamic therapy. The prepared target complexes are shown in the specification.

The invention relates to the technical field of up-conversion materials, in particular to a compound and a preparation method thereof and a triplet-triplet annihilation up-conversion system. The invention discloses the compound with a structure as shown in a formula (I). The compound has a thermal activation delayed fluorescence characteristic and a heavy atom effect, and can be used as a thermally-activated delayed fluorescence material and a triplet-triplet annihilation up-conversion photosensitizer, and the heavy atom effect can significantly increase the lowest triplet exciton concentration of the photosensitizer and improve up-conversion quantum efficiency. The up-conversion photosensitizer with the structure shown in the formula (I) has visible light absorption and red light or near-infrared light emission properties and forms a triplet-triplet annihilation up-conversion system with 9,10-diphenylanthracene; and the system realizes up-conversion luminescence under the condition ofhigh excitation light power density in an organic solvent, can effectively convert green light into blue light, and has a up-conversion quantum yield of 24.4%.

A light-emitting element that includes a fluorescent material and has a high emission efficiency is provided. A light-emitting element in which a delayed fluorescence component due to TTA accounts for a high proportion of emissive components is provided. A novel light-emitting device with a high emission efficiency and a low power consumption is provided. A light-emitting element includes an anode, a cathode, and an EL layer. The EL layer includes a light-emitting layer including a host material and an electron-transport layer including a first material in contact with the light-emitting layer. The LUMO level of the first material is lower than that of the host material. The proportion of a delayed fluorescence component due to TTA is greater than or equal to 10 percent of the light emission from the EL layer. The proportion of the delayed fluorescence component due to TTA may be greater than or equal to 15 percent of the light emission.

The invention discloses a triplet-triplet annihilation up-conversion hydrogen production system. The up-conversion hydrogen production system is prepared from a photosensitizer, acceptor molecules, a hydrogen production catalyst and a sacrificial body, wherein the photosensitizer is palladium porphyrin, the acceptor molecules are 9,10-bis phenylethynyl anthracene, the hydrogen production catalyst is Cd0.5Zn0.5S, and the sacrificial body is prepared from Na2SO3 and Na2S. The up-conversion hydrogen production system has good stability and efficient catalytic hydrogen production activity. The invention also discloses a construction method of the up-conversion hydrogen production system, and application of the up-conversion hydrogen production system in photocatalytic hydrogen production.

Various exemplary photoreactions can be provided, including reactions generally based on triplet-triplet annihilation upconversion. Representative photosensitizers include PdPc(OBu)8 and PtTPTNP. Representative annihilators include FDPP and TTBP. Such exemplary photoreactions, systems and methods may be used in a variety of applications, including various biological or physical applications. Exemplary methods can also be provided for making or using such systems, photoreactions, kits including such systems, or the like.

Provided is a light-emitting element with high emission efficiency including a fluorescent material as a light-emitting substance. In a light-emitting element including a pair of electrodes and an EL layer between the pair of electrodes, a delayed fluorescence component due to triplet-triplet annihilation accounts for 20% or more of light emitted from the EL layer, and the light has at least one emission spectrum peak in the blue wavelength range. The EL layer includes an organic compound in which an energy difference between the lowest singlet excited energy level and the lowest triplet excited energy level is 0.5 eV or more. The EL layer includes a benzo[a]anthracene compound.

The present invention generally relates to composition and methods for upconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the nanocrystal and the organic material. In certain embodiments, the nanocrystal has a first excited energy state with an energy greater than a triplet 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 nanocrystal to produce triplet excitons. The triplet excitons may then transfer from the nanocrystal to the organic material and undergo triplet-triplet annihilation, creating a singlet state of approximately twice the energy of the triplet exciton. In certain embodiments, the singlet state fluoresces, resulting in the formation of a high energy photon.

Provided is an EL element utilizing upconversion light emission involving highly efficient triplet-triplet annihilation. A blue-light-emitting layer includes an ionic liquid, a red phosphorescent material, and a blue fluorescent material. The blue fluorescent material and the red phosphorescent material are homogeneously dispersed in a liquid film of the ionic liquid.