47 results about "Triplet triplet annihilation" patented technology

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.

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.

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 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.

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.