117results about How to "Reduce self-quenching" patented technology

Methods and compositions involving enzyme-activatable fluorophore polymer imaging agents for photodetection of specific tissues and/or human diseases and disorders are provided. In certain embodiments, the imaging agent comprises a hydrophilic polymer backbone (e.g., poly(L)lysine), a hydrophobic fluorophore, and a hydrophilic solubilizing agent. The solubilizing agent may comprise a quarternary ammonium group (e.g., a 1-methylnicotinic group) to enhance self-quenching of the fluorophore. Various methods for the generation and purification of imaging agents are also provided, including methods involving solid phase probe extraction or ion exchange purification.

The invention relates to organic electroluminescence luminous close white luminescent material and the preparing method. The material has basic structure of the tri-aromatic amine which has extensibility in three-dimensional space to reduce agglomeration among molecule and luminescent material self quenching, many different chromophoric group-benzothiazole which can increase luminous intensity for molecule which has better electron transmission characteristic, can produce formless film with high thermal stability and good uniformity. Thus the material can be used to make close white organic electroluminescence device or panchromatic one with other materials. It has wide application prospect in other optoelectronic device.

The invention provides a red-light metal complex shown as a formula (I). In the formula, m is 2 and n is 1 or m is 3 and n is 0; R1 is independently selected from C1 to C10 alkyl, C1 to C10 substituted alkyl and C6 to C10 aryl; R2 is independently selected from C1 to C10 alkyl, C6 to C25 aryl and C6 to C25 heterocyclic aryl; Ar is C6 to C30 heterocyclic aryl. According to the red-light metal complex provided by the invention, an aromatic group is connected with fluorene to form a main group; meanwhile, triphenylamine is used as an end-capping group; the main group and the end-capping group have a synergistic effect and a stereo-hindrance effect of the triphenylamine is utilized, so that the mutual acting force between dye molecules is reduced and a self-quenching phenomenon of triple-state excitons in a solid-state film is reduced; meanwhile, the HOMO energy grade is improved by utilizing a strong electron donating effect, so that a band gap is reduced and red shift of a light spectrum is realized. A red-light to deep red-light phosphorescent iridium complex provided by the invention has relatively good dissolubility in a common solvent and solution machining type devices are easy to prepare; an organic electroluminescent device prepared by the red-light metal complex has relatively high luminous efficiency and power efficiency.

The invention provides a red organic electrophosphorescent material iridium metal complex with the structure represented by formula (1). In the formula (1), R is a hydrogen atom or a C1-C4 straight chain or alkoxy group. The red organic electrophosphorescent material iridium metal complex is prepared through the following steps: carrying out a Grignard reaction on an iridium metal complex to prepare a compound C, carrying out dehydration cyclization on the compound C to obtain a cyclomedtalating ligand, carrying out a polymerization reaction on the cyclomedtalating ligand and chromium trichloride hexahydrate in a 2-ethoxyethanol and water mixed solvent to obtain a chlorendic dimer, and carrying out a complex reaction on the chlorendic dimer and acetylacetone to obtain the red organic electrophosphorescent material iridium metal complex represented by formula (1). The above material has good energy transmission efficiency and appropriate red light emitting wavelength, and can be widely used to make red or white phosphorescent electroluminescent devices in order to reduce the power consumption of the devices, improve the performances of the devices and prolong the life of the devices.

The present invention discloses porous membrane composed of cellulose doped with 1,4-dihydroxy anthraquinone and bivalent copper ions and a preparation method and application thereof. The porous membrane has a porous net structure composed of nano-fibers with a diameter of 300-500 nm and with surface covered with micropores. The nanofiber is composed of cellulose, 1,4-dihydroxy anthraquinone and divalent copper ions with a mass ratio of 75-85:1:1.8-2.2. The preparation method includes: mixing cellulose acetate, 1,4-dihydroxy anthraquinone, copper nitrate hydrate, and a solvent to obtain a spinning solution, placing the spinning solution on an electrostatic spinning machine for electrostatic spinning to obtain the porous membrane composed of cellulose doped with 1,4-dihydroxy anthraquinone and bivalent copper ions, soaking the porous membrane composed of cellulose doped with 1,4-dihydroxy anthraquinone and bivalent copper ions in a sodium hydroxide solution to get the target product. The porous membrane is used as a fluorescence sensing material for trace rapid detection of trivalent chromium ions, when the fluorescence analysis method is used for detection.

The invention belongs to the field of organic semiconductor materials, and discloses a blue-light organic electrophosphorescence material, and a preparation method and application thereof. The material has the following structural formula, wherein R is a hydrogen atom, C1-C6 alkyl group or C1-C6 alkoxy group; X and Y are respectively Cl or F; and LK is an auxiliary ligand contained by an iridium metal complex. The blue-light organic electrophosphorescence material disclosed by the invention uses 2,3'-dipyridine as a major structure of the ring metal ligand, and the introduction of the alkyl and alkoxy groups can obtain satisfactory energy transfer efficiency and blue-light emitting wavelength and can a certain steric hindrance effect, thereby reducing the direct actions among metal atoms, reducing the self-quenching phenomenon of triplet-state excitons and greatly enhancing the light conversion efficiency of the material; and meanwhile, the F and Cl substitution on the ring metal ligand can improve the luminescence property, facilitate vapor deposition, improve the film-forming property, enhance the stability of the device and enhance the color purity.

The invention provides a red organic electrophosphorescent material iridium metal complex with the structure represented by formula (1). In the formula (1), R is a hydrogen atom or a C1-C4 straight chain or alkoxy group. The red organic electrophosphorescent material iridium metal complex is prepared through the following steps: carrying out a Suzuki coupling reaction on an iridium metal complex to prepare a cyclomedtalating ligand, carrying out a polymerization reaction on the cyclomedtalating ligand and chromium trichloride hexahydrate in a 2-ethoxyethanol and water mixed solvent to obtain a chlorendic dimer, and carrying out a complex reaction on the chlorendic dimer and an auxiliary ligand acetylacetone to obtain the red organic electrophosphorescent material iridium metal complex represented by formula (1). The above material has good energy transmission efficiency and appropriate red light emitting wavelength, and can be widely used to make red or white phosphorescent electroluminescent devices in order to reduce the power consumption of the devices, improve the performances of the devices and prolong the life of the devices.

The present invention discloses a red light organic electrophosphorescence material metal iridium coordination compound having a structural formula represented by a formula (P), wherein R is methyl. The preparation method comprises that: a Suzuki coupling reaction is performed to obtain a ring metal ligand, the ring metal ligand and iridium trichloride trihydrate are subjected to a polymerization reaction in a 2-ethoxyethanol and water mixed solvent to obtain a chloro-bridge dimer, and the chloro-bridge dimer and 2,2,6,6-tetramethyl-3,5-heptanedione are subjected to a coordination reaction to obtain the red light organic electrophosphorescence material metal iridium coordination compound. The present invention further provides an organic electroluminescent device containing the metal iridium coordination compound. According to the present invention, 2,2,6,6-tetramethyl-3,5-heptanedione is added to the ring metal ligand as the auxiliary ligand so as to increase the steric hindrance effect of the metal iridium coordination compound, such that the direction effect between the metal atoms is reduced, the self-quenching phenomenon of the triplet state excitons is reduced, and the luminescence efficiency of the organic electroluminescent device is increased.

The invention discloses a sulfur-bridged quinazoline-based tetradentate platinum complex phosphorescent material and a preparation method thereof. The phosphorescent material has a general structure represented by formulae (I) and (II) as shown in the specification. In the formulae, R can be one selected from the group consisting of phenyl, 4-fluoro-substituted phenyl, 2,4-difluoro-substituted phenyl, 3,4,5-trifluoro-substituted phenyl, 4-trifluoromethyl-substituted phenyl, 2-trifluoromethyl-substituted phenyl, 2,6-dimethyl-substituted phenyl, 4-methoxy-substituted phenyl, 4-nitro-substitutedphenyl, 4-N,N-dimethylamino-substituted phenyl, 2-benzothienyl, 2-benzofuryl, 9-(4-substituted phenyl)carbazole, 9-(4-substituted-phenyl)phenothiazine, 2-substituted 9,9-dimethylfluorenyl, tert-butoxy, 2,6-dimethyl-substituted phenoxy, hexahydropyridyl, N-carbazolyl, N-diphenylamino, N-bis(4-a tertiary butyl phenyl)amino, N-phenothiazinyl, 9,9-methylacridanyl radicals.

The invention provides a red organic electrophosphorescent material iridium metal complex with the structure represented by formula (1). In the formula (1), R is a hydrogen atom or a C1-C4 straight chain or alkoxy group. The red organic electrophosphorescent material iridium metal complex is prepared through the following steps: carrying out a Suzuki coupling reaction on an iridium metal complex to prepare a cyclomedtalating ligand, carrying out a polymerization reaction on the cyclomedtalating ligand and chromium trichloride hexahydrate in a 2-ethoxyethanol and water mixed solvent to obtain a chlorendic dimer, and carrying out a complex reaction on the chlorendic dimer and the cyclomedtalating ligand to obtain the red organic electrophosphorescent material iridium metal complex represented by formula (1). The above material has good energy transmission efficiency and appropriate red light emitting wavelength, and can be widely used to make red or white phosphorescent electroluminescent devices in order to reduce the power consumption of the devices, improve the performances of the devices and prolong the life of the devices.

The invention belongs to the field of photoelectric materials, and in particular relates to a blue ray organic electroluminescent material with the structural formula shown as P, wherein R is hydrogen atom or C1-C20 alkyl. The blue ray organic electroluminescent material has higher LUMO (lowest unoccupied molecular orbital) energy level and lower HOMO (highest occupied molecular orbital) energy level, is conducive to blue shift of material luminescent wavelength, and also has higher phosphorescence quantum efficiency and better dissolution properties and processing properties. The invention also provides a preparation method of the blue ray organic electroluminescent material and application of the blue ray organic electroluminescent material in organic electroluminescent devices.

The invention belongs to the field of photoelectric materials, and in particular relates to a blue ray organic electroluminescent material with the structural formula shown as P, wherein R is hydrogen atom or C1-C20 alkyl. The blue ray organic electroluminescent material has higher LUMO (lowest unoccupied molecular orbital) energy level and lower HOMO (highest occupied molecular orbital) energy level, is conducive to blue shift of material luminescent wavelength, and also has higher phosphorescence quantum efficiency and better dissolution properties and processing properties. The invention also provides a preparation method of the blue ray organic electroluminescent material and application of the blue ray organic electroluminescent material in organic electroluminescent devices.

The invention provides an organic electroluminescent material, a preparation method of the organic electroluminescent material and an organic electroluminescent device. The organic electroluminescent material has a general formula (P) as shown in the specification, wherein R1 is hydrogen atom, C1-20 linear alkyl, C1-20 branched alkyl, C1-20 linear alkoxy or C1-20 branched alkoxy. According to the organic electroluminescent material, 2-(2',4'-difluoro-3'-cyanophenyl) pyrimidine serving as a cyclometalated ligand and acetylacetone serving as an auxiliary ligand are adopted to synthesize a blue-light organic electroluminescent material iridium complex, and the illuminating color of the material is adjusted through chemical modification performed by introducing alkyl chain on the pyrimidine ring of the cyclometalated ligand, so that phosphorescence emission having blue emission wavelength and high luminescence efficiency can be obtained.

The invention relates to an organic electrophosphorescent material and a preparation method thereof and an organic light-emitting device. The organic electrophosphorescent material (P) has a structure (P) shown in the specification, wherein R is phenyl, fluorenyl or carbazolyl. According to the organic electrophosphorescent material, 2-(2',3',4'-trifluorophenyl)pyrimidine is taken as a cyclometalated ligand, and 2,4-di(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole is taken as an auxiliary ligand to synthesize a blue-light organic electrophosphorescent material iridium metal ligand. Moreover, the adjustment of the light-emitting color of the material is realized through chemical modification of the phenyl, fluorenyl or carbazolyl introduced onto a pyrimidine ring of the cyclometalated ligand, thereby obtaining blue-light phosphorescence emission with high luminous efficiency.

The invention belongs to the field of photoelectric materials, and specifically relates to a blue light organic electroluminescent material. A structural formula (P) is shown in the description. In the formula, R represents alkoxy of C1-C20. The blue light organic electroluminescent material has a relatively high LUMO energy level and relatively low HOMO energy level, is beneficial to blue shift of luminescent wavelengths of the material. The blue light organic electroluminescent material also has relatively high fluorescence quantum efficiency, relatively good solubility and processability. The invention also provides a preparation method of the blue light organic electroluminescent material, and an application of the blue light organic electroluminescent material in an organic electroluminescent device.

The invention relates to a red phosphorescent iridium complex and a preparation method thereof, and an organic electroluminescence device. The red phosphorescent iridium complex has a structural formula as described in the specification; and in the formula, R is hydrogen or a methyl group. The red phosphorescent iridium complex is a same-ligand type iridium complex using 1-(4'-trifluoroacetylphenyl)isoquinoline as the main structure of a cyclometalated ligand; an isoquinoline ring is an optimal structure option of the cyclometalated main ligand of a red phosphorescent material and can guarantee that the material emits light at red bands; as the methyl group is introduced on the isoquinoline ring, certain steric hindrance effect can be produced, direct action among metal atoms and self-quenching of triplet exciton can be reduced and the luminous efficiency of material can be improved. Thus, as the red phosphorescent iridium complex is applied to the organic electroluminescence device, the luminescence performance of the organic electroluminescence device can be improved.

The invention belongs to the field of organic semiconductor materials and discloses a blue light-emitting organic electroluminescent material and its preparation method and use. The blue light-emitting organic electroluminescent material has a general structural formula shown in the description, and in the formula, R represents hydrogen atom, alkyl or alkoxy and LX represents an auxiliary ligand in the iridium complex. The blue light-emitting organic electroluminescent material comprises 3-phenylpyridazine as a ring metal ligand main structure and also comprises alkyl and alkoxy so that satisfactory energy transmission efficiency and blue light emission wavelength are obtained and a certain steric-hinerance effect is produced and thus direct action between metal atoms is reduced and triplet exciton self-quenching phenomenon is reduced. Two F substituent groups on the phenyl ring effectively realize blue shift of emission wavelength, improve luminescence performances, are conducive to vapor plating, and improve film-forming property and device stability. Through use of the high-field intensity azole auxiliary ligand, further blue shift of material emission wavelength is realized.

The invention relates to a blue phosphorescence material iridium metal complex, its preparation method and an organic electroluminescent device. The blue phosphorescence iridium metal complex is characterized in that the structural formula of the blue phosphorescence iridium metal complex is as defined in the specification, wherein R is hydrogen or an alkyl group with carbon atom number being 1-20. By the use of the above blue phosphorescence iridium metal complex, electroluminescent performance of the organic electroluminescent device can be raised.

The invention belongs to the organic electroluminescent material, and discloses a red organic electroluminescent material and a preparation method and application thereof. The material has a general structural formula as follows, wherein R represents phenyl, naphthyl-1-yl or naphthyl-2-yl. The red organic electroluminescent phosphorescent material provided by the invention uses 2-(9',9'-dimethyl fluorene-2'-yl)-5-aryl formyl pyridine as a main structure of a ring metal ligand, and the introduction of phenyl, naphthyl-1-yl and naphthyl -2-yl formyl realizes acquisition of satisfactory red emission wavelength; the presence of large groups such as triphenylamine, phenyl or naphthyl can produce a certain space steric effect, thereby reducing the direct interaction between metal atoms, and reducing self quenching phenomenon of triplet exciton; at the same time, aromatic groups can effectively control the energy levels of highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of the material, and facilitate the balance of charge transfer in a device, so as to improve the luminescent properties of the device.

The invention relates to a red phosphorescent iridium complex and a preparation method thereof, and an organic electroluminescence device. The red phosphorescent iridium complex has a structural formula as described in the specification; and in the formula, R is hydrogen or a methyl group. The red phosphorescent iridium complex uses 1-(4'-trifluoroacetylphenyl)isoquinoline as the main structure of a cyclometalated ligand and 2,2,6,6-tetramethyl-3,5-heptadione as an ancillary ligand; an isoquinoline ring can emit light at red bands; the methyl groups on the isoquinoline ring produce different electronic effects at different C positions, thereby realizing emission of red light of different wave lengths, exerting steric hindrance effect, reducing direct action among metal atoms and self-quenching of triplet exciton and improving the luminous efficiency of materials; and relative to hydrogen atoms, introduction of a trifluoroacetyl group on a benzene ring enables molecular vibration energy to be reduced and the luminous efficiency and intensity of the red phosphorescent iridium complex to be improved. The red phosphorescent iridium complex can improve the luminescence performance of the organic electroluminescence device.

The invention belongs to the field of photoelectric materials, and specifically relates to an organic electroluminescent material. A structural formula is shown in the description. In the formula, R represents alkyl of C1-C20. The organic electroluminescent material has a relatively high LUMO energy level and relatively low HOMO energy level, and is beneficial to blue shift of luminescent wavelengths of the material. The organic electroluminescent material also has relatively high phosphorescence quantum efficiency, relatively good solubility and processability. The invention also provides a preparation method of the organic electroluminescent material, and an application of the organic electroluminescent material in an organic electroluminescent device.

The invention belongs to the field of photoelectric materials, and specifically relates to an organic electroluminescent material. A structural formula is shown in the description. In the formula, R represents alkyl of C1-C20. The organic electroluminescent material has a relatively high LUMO energy level and relatively low HOMO energy level, and is beneficial to blue shift of luminescent wavelengths of the material. The organic electroluminescent material also has relatively high phosphorescence quantum efficiency, relatively good solubility and processability. The invention also provides a preparation method of the organic electroluminescent material, and an application of the organic electroluminescent material in an organic electroluminescent device.