51 results about "Intersystem crossing" patented technology

The invention discloses an acridine-derived thermally activated delayed fluorescent material and an electroluminescent device thereof, and belongs to the technical field of organic luminescent materials. According to the fluorescent material, any electron withdrawing group is used as a receptor, an acridine derivative is used as a donor, nitrogen atoms of the acridine derivative are directly connected with the receptor, a dihedral angle between an electron donor and the electron receptor is increased, the dihedral angle is kept at an angle close to 90 degrees, meanwhile, the large-rigidity donor structure further reduces intramolecular vibration relaxation, and the fluorescence intensity is improved. In addition, HOMO delocalization can be further realized through side conjugation modification of acridine, so that large antiintersystem crossing rate and radiation decay rate are realized, the luminescence property of molecules is further improved, and the efficiency roll-off is reduced. The material provided by the invention can be used as an active material to be applied to organic electroluminescent devices.

The invention discloses a boron-nitrogen compound and an organic electroluminescent device using the same, and relates to the technical field of organic electroluminescence. According to the boron-nitrogen compound provided by the invention, spiro and electron donor groups are introduced, so that the reverse intersystem crossing rate of molecules is favorably improved, triplet state exciton quenching is overcome, intermolecular close packing is effectively inhibited, the problem of spectrum broadening under high doping concentration is relieved, and the color purity of a device is improved; the compound is applied to a luminescent layer doping material of an organic electroluminescent device, so that the stability of the device is improved, and the service life of the device is prolonged.

The invention belongs to the technical field of organic photoelectric materials, and provides a boron-nitrogen-containing multi-element heterocyclic ring material and an organic electroluminescent device comprising the same. The boron and nitrogen-containing multi-element heterocyclic ring material provided by the invention is a brand-new sensitized material and doped material with a boron and nitrogen six-element heterocyclic ring at the center of a molecular skeleton and a multi-benzene ring structure. The structure has good stability, and can inhibit molecular vibration relaxation and reduce non-radiative transition, thereby achieving a good service life. Meanwhile, the material has good high exciton utilization rate and small delta EST, intersystem crossing can be achieved more easily, and better photoelectric conversion efficiency is achieved.

The invention relates to the technical field of organic photoelectric materials, and provides a silicon-containing boron-nitrogen compound, a preparation method thereof and an organic electroluminescent device. A double-silicon structure and tert-butyl in the compound can reduce molecular accumulation and inhibit exciton quenching; meanwhile, the resonance structure of B-N / Si can reduce the single triplet state energy gap, improve the reverse intersystem crossing (RISC) rate, reduce the efficiency loss under high brightness, and improve the luminous efficiency. In addition, the boron-nitrogen structure is high in rigidity, and the thermal stability of molecules can be improved, so that the service life of the device is effectively prolonged. The compound provided by the invention is used as a doping material, so that the prepared organic electroluminescent device has low driving voltage, high luminous efficiency and long service life.

Provided is an organic modulation element including an organic modulation layer containing a plurality of organic semiconductor molecules, a first electrode, and a second electrode. Each of the plurality of organic semiconductor molecules is a molecule in which an excited state enabling reverse intersystem crossing from a lowest excited triplet state to a lowest excited singlet state is formed due to irradiation with the input light. In each of the plurality of organic semiconductor molecules, an intersystem crossing rate constant from the lowest excited singlet state to the lowest excited triplet state is greater than a reverse intersystem crossing rate constant from the lowest excited triplet state to the lowest excited singlet state, and the reverse intersystem crossing rate constant from the lowest excited triplet state to the lowest excited singlet state is greater than a non-radiative deactivation rate constant from the lowest excited triplet state to a ground state.

The invention discloses a boron-containing polycyclic compound and an organic photoelectric element containing the same, and belongs to the field of organic photoelectricity. The boron-containing polycyclic compound has a structure as shown in a formula (1) or a formula (2). According to the compound, a boron-containing skeleton and a carbazole derivative are fused through intramolecular conjugation expansion, and a novel rigid unit is constructed. The conjugated fusion not only integrates the electron transport capability of a boron-containing skeleton and the hole transport characteristic and high triplet state energy level of carbazole, but also effectively increases the orbital delocalization range and significantly reduces the singlet state-triplet state energy level difference (delta EST) by reconstructing the distribution of a front line molecular orbital, thereby enhancing the reverse intersystem crossing rate (kRISC) of the compound, and enhancing the efficiency of the compound. And the utilization efficiency of triplet excitons is obviously promoted. When the material is used as a host material to be applied to an organic light-emitting diode, efficient and directional transfer of energy to an object can be ensured, the efficiency of a device is improved, the stability of the device is improved, and the material has a good commercialization prospect.

The application discloses an ESIPT luminescent material with high exciton utilization, a preparation method and application thereof, combines ESIPT properties and thermal activated delayed fluorescence properties, designs and synthesizes an ESIPT material capable of generating a high-energy level triplet excited state to a single excited state reverse intersystem crossing mechanism. The molecular excited state of the material has a significant hybridization of local charge transfer properties, and has a high exciton utilization. Meanwhile, the material has good thermal stability and film forming property, and single molecule yellow light and single molecule white light OLEDs are prepared; the application also dopes a TADF blue light material and the above ESIPT yellow light material as a light emitting layer, and the energy transfer between the two is blocked, the complementary color host-guest light emitting peaks are adjusted by a doping ratio, and a low-cost, repeatable, efficient, EL spectrum stable, color adjustable white light OLED device is prepared.

The invention belongs to the technical field of nano materials, and discloses a preparation method of an Au nano material with a layered hybrid superlattice structure. According to the method, a coordination confinement synthesis strategy is adopted, 4-mercaptobenzoic acid is taken as a structure-directing agent, and the organic-inorganic alternating layered superlattice structure is successfully prepared under the condition of CO weak reduction by utilizing a strong coordination bond formed by sulfydryl of 4-mercaptobenzoic acid and gold and a pi-pi conjugate synergistic effect of a benzene ring and combining a soft template confinement effect of octadecylamine. The superlattice material has a long-range disordered amorphous structure and an adjustable interlayer spacing (2.9 to 4.7 nm), and shows the white light emission characteristics of wide-spectrum ultraviolet-visible absorption (250 to 600 nm) and adjustable color temperature (3200 to 6500 K). According to the invention, a quantitative structure-function relationship of interlayer spacing-ligand metal interaction-optical performance is established, effective regulation and control of intersystem crossing process and phosphorescence lifetime from microsecond to millisecond magnitude are realized, and an innovative solution is provided for solving the problem of metal-organic layer interface compatibility; and an important material platform and theoretical support are provided for developing a novel flexible photoelectric device.

A method includes applying an optical pulse to a fluorophore to drive the fluorophore from a ground singlet state to an excited singlet state. In response, the fluorophore undergoes an intersystem crossing from the excited singlet state to a metastable triplet state. A microwave pulse is then applied to the fluorophore to at least partially transfer the fluorophore from an initial spin-qubit state to an encoded spin-qubit state. A second optical pulse may be applied to the fluorophore to drive the fluorophore from the metastable triplet state to a higher-energy triplet state, wherein the fluorophore undergoes a reverse intersystem crossing to an excited singlet state. A photon emitted by the fluorophore, in response to the fluorophore decaying from the excited singlet state to the ground singlet state, is then detected.

The invention discloses a sulfur or selenium heavy atom-containing host material and electroluminescent application thereof, and belongs to the technical field of organic electroluminescence. The host material has a structure as shown in a general formula (1), wherein R1 and R2 in the general formula (1) represent electron-rich groups with hole transport capability or electron-deficient groups with electron transport capability. The main body material can form exciplex action with TADF dye, can effectively promote trans-intersystem crossing of the TADF dye, and can be used for preparing electroluminescent devices. The main body material is used as a main body of a TADF dye to prepare an electroluminescent device, and the device has excellent performances of high efficiency, low efficiency roll-off and the like. General formula (1)

A kind of boron-containing thermally activated delayed fluorescence material and its application belong to electroluminescent material technical field.The present application relates to organic electroluminescent technical field.In the material, boron-nitrogen resonance skeleton is integrated with donor-acceptor unit in molecular design, boron-nitrogen resonance skeleton is used as electron acceptor unit, and strong electron donor unit is connected by reasonable space and electronic structure, and unique synergistic effect is generated.The material can accurately control the distribution and overlap degree of highest occupied molecular orbital and lowest unoccupied molecular orbital, promote efficient reverse intersystem crossing (RISC), and effectively inhibit the molecular structure relaxation when electron transition, so as to realize narrow-band emission.In the prepared OLED device, narrow-band emission and high external quantum efficiency are realized at the same time.This kind of material has broad application prospect in next-generation high-definition display and lighting devices.

The application discloses a preparation method and application of a halogenated 2,1,3-benzothiadi-azolyl blue light molecule, and the method comprises the following steps: taking 2,1,3-benzothiadi-azolyl as a parent body, and coupling corresponding boric acid and a halogenated acceptor in a mixed solvent of tetrahydrofuran and water under the action of a palladium catalyst to obtain a target product after purification. The molecule shows obvious hybridization and charge transfer properties, realizes high triplet exciton utilization rate through a high-energy state reverse intersystem crossing process, effectively enhances spin-orbital coupling by introducing heavy atoms, and improves the absorption capacity to high-energy radiation, so that the molecule has the outstanding advantages of super-short fluorescent lifetime and high photoluminescence efficiency, and provides a new solution for developing a new generation of organic luminescent materials with super-short lifetime, high efficiency and low cost.

The invention provides a boron-nitrogen compound and an organic electroluminescent device using the same, and relates to the technical field of organic electroluminescence. The boron-nitrogen compound provided by the invention has high color purity and high reverse intersystem crossing rate. A rigid group is introduced to a central benzene ring, so that the molecular vibration relaxation is reduced, the FWHM is reduced, and the color purity is improved; meanwhile, derivative donors containing heteroatom phenoxazine or phenothiazine and the like are introduced, spin-orbit coupling is promoted by utilizing a heavy atom effect, so that the reverse intersystem crossing rate of excitons from a triplet state to a singlet state is increased, and the triplet state exciton extinguishing process is weakened. In addition, a large-volume peripheral substituent group is introduced to inhibit aggregation among molecules, so that a mutual quenching phenomenon among the molecules is weakened, and the luminous efficiency is improved. Therefore, when the compound is applied to the organic electroluminescent device, the color purity and luminous efficiency of the organic electroluminescent device can be improved.

To provide an organic compound having a large reverse intersystem crossing rate constant (kRISC).SOLUTION: The organic compound is represented by general formula (1). In the formula (1), ring a to ring c are each independently selected from an aryl ring and the like. X is a sulfur atom or the like. R1 to R3 are each independently selected from hydrogen atoms, alkyl groups, and the like. However, at least two of R1 to R3 are each independently selected from groups represented by the formula (2). In the formula (2), R4 to R11 are each independently selected from hydrogen atoms, alkyl groups, and the like. Adjacent two of R4 to R11 may be bonded to the group represented by the formula (3). In the formula (3), R12 to R15 are each independently selected from hydrogen atoms, alkyl groups, and the like. Y is selected from an oxygen atom and the like; SELECTED DRAWING: None

The invention discloses a boron-containing thermal activation delayed fluorescent material and application thereof, and belongs to the technical field of electroluminescent materials. The invention relates to the technical field of organic electroluminescence. In the material, a boron-nitrogen resonance skeleton and a donor-acceptor unit are subjected to integrated molecular design, and the boron-nitrogen resonance skeleton is used as an electron acceptor unit and is connected with a strong electron donor unit through a reasonable space and an electron structure to generate a unique synergistic effect. The material can accurately regulate and control the distribution and overlapping degree of the highest occupied molecular orbital and the lowest unoccupied molecular orbital, promotes efficient reverse intersystem crossing (RISC), and effectively inhibits molecular structure relaxation during electron transition, thereby realizing narrow-band emission. And narrow-band emission and high external quantum efficiency can be simultaneously realized in the prepared OLED device. The material has a wide application prospect in next-generation high-definition display and illumination devices.

The invention belongs to the technical field of organic electroluminescent materials, and particularly relates to a compound with a nine-ring side chain and an organic electroluminescent device.The series of compounds contain a large conjugate fragment and a benzo five-membered heterocyclic ring or five-membered heterocyclic ring structure, sulfur and other heavy atoms contained in the large conjugate fragment can improve the spin-orbit coupling capacity, and therefore the stability of the compound is improved. According to the invention, charge transfer in molecules is enhanced, so that a higher anti-intersystem crossing coefficient is achieved, efficient conversion of triplet excitons can be realized, and loss of the excitons is reduced; meanwhile, the compound structure has an extremely remarkable intramolecular distortion structure, molecular stacking is effectively reduced, annihilation of carriers and excitons is inhibited, triplet-state excitons can be converted more efficiently, combination of the excitons in a light-emitting layer is guaranteed through cooperation of the structures of all the parts, and the light-emitting efficiency is improved. Therefore, the comprehensive performance of the organic light-emitting device is improved.

The application discloses a narrow-band blue light molecule and a preparation method and application thereof. The application introduces two donor units into a fluorene skeleton, forms a dislocation structure with a multiple resonance unit in space, and regulates the strength of the space charge transfer. On one hand, the reverse intersystem crossing rate can be improved to improve the performance and efficiency of a device. On the other hand, the high-efficiency light emission of the narrow-band is maintained. The application further discloses a preparation method and application of the material. The narrow-band blue light molecule can be used as a novel light-emitting molecule with high performance, high color purity and high quantum efficiency. The narrow-band blue light molecule has great application potential in the preparation of light-emitting materials, light-emitting devices and electronic technology, and has a bright prospect in the field of display technology and solid-state lighting.

This invention discloses a binaphthyl compound, its preparation method, and its applications. The structural formula of the binaphthyl compound is shown in any one of formulas A1-A5. In the technical solution of this invention, an organic phosphorescent molecule is developed by rationally designing its molecular structure, maintaining an appropriate energy level difference between the singlet and triplet excited states, enabling effective intersystem crossing (ISC) from the singlet to the triplet excited state; and by creating a rigid environment, the non-radiative deactivation of the triplet excited state of the organic phosphorescent molecule is suppressed, thereby obtaining efficient, stable, and long-lived phosphorescence.

Provided are an organic electroluminescent device, a display panel, and a display apparatus. An exciton layer adjacent to a light-emitting layer is added, and the exciton layer serves as an exciton recombination region and achieves the effect of increasing the density of excitons, where the singlet-state energy level of the exciton layer is higher than the singlet-state energy level of a host material in the light-emitting layer, and an emission spectrum of the exciton layer and an absorption spectrum of the host material in the light-emitting layer have an overlapping area. Moreover, the exciton layer allows triplet-state excitons formed in the exciton layer to form singlet-state excitons via a reverse intersystem crossing process.

The invention discloses a boron-nitrogen-containing organic compound and an organic light-emitting device thereof, and relates to the technical field of organic light-emitting devices. According to the boron-nitrogen-containing organic compound provided by the invention, a rigid group is introduced, so that close packing and pi-pi interaction among molecules are effectively inhibited, the rigidity of the molecules is increased, the vibration relaxation of the molecules is reduced, the reverse intersystem crossing rate of MR-TADF molecules is favorably increased, the quenching of triplet excitons is overcome, and the organic compound has a good application prospect. And the problem of spectrum broadening under high doping concentration is relieved, the color purity of the device is improved, and the service life of the device is prolonged.

The invention belongs to the technical field of organic electroluminescent materials, and particularly relates to a compound with a meta-substituted cyano structure and an organic electroluminescent device of the compound. Benzo five-membered heterocycle or five-membered heterocycle is introduced to a parent nucleus with the meta-substituted cyano structure to serve as a central parent nucleus; and the synergistic effect of multiple beneficial effects is realized on the molecular level. The compound is a sensitizer with good performance, has a smaller energy gap, a higher anti-intersystem crossing coefficient and a higher radiative transition radiation rate, and also has higher fluorescence quantum efficiency and a more suitable emission peak position; the organic light-emitting device prepared by using the compound as the sensitizer has lower turn-on voltage, higher current efficiency and longer service life, and the comprehensive performance of the device can be balanced.

The invention belongs to the field of electroluminescence, and discloses an organic electroluminescent device and a display device. The organic light-emitting device comprises a light-emitting layer, wherein the light-emitting layer comprises a host material, a sensitizer and a light-emitting guest material; the structure of the deuterated benzonitrile derivative is shown as a formula I; formula I; the host material is at least one of H-1 to H-12 or deuterated compounds thereof; and the light-emitting guest material is one of BD-1 to BD-19 or deuterated compounds of the BD-1 to BD-19. The organic light-emitting device constructed by the subject material, the sensitizer and the light-emitting object material which are specifically combined has a high reverse intersystem crossing rate, the performance is better in the aspect of effect roll-off, and the service life of the device is well prolonged.

The invention discloses a D-A-D'asymmetrically decoupled organic X-ray scintillator, and a synthesis method and application of the D-A-D 'asymmetrically decoupled organic X-ray scintillator. According to the invention, naphthalimide is used as an electron acceptor (A), a benzene bridge is connected with a donor (D) to realize self-selective orbital coupling, and a secondary donor (D ') and A are in linear face-to-face conjugation to construct a twisted illuminant. The configuration can independently regulate and control D and D'so as to balance a singlet-triplet energy gap (delta EST) and spin-orbit coupling (SOC), accelerate intersystem crossing (ISC) and reverse intersystem crossing (RISC) processes, and realize phosphorescence dominated at low temperature and TADF dominated dual-mode temperature adaptive luminescence at room temperature and above; meanwhile, aggregation-induced emission quenching is inhibited, and high luminous efficiency is ensured. The N-CZ has photocatalytic performance and can be used for preparing a flexible X-ray film through photopolymerization. The invention provides a new design thought and preparation method for the next-generation high-performance organic X-ray scintillator.

A multi-resonance thermally activated delayed fluorescence material based on peripheral heavy atom substitution and its application in organic electroluminescent devices belong to the technical field of organic electroluminescent devices. The multi-resonance thermally activated delayed fluorescence material based on peripheral heavy atom substitution described in the present invention introduces heavy atoms on the periphery of the multi-resonance skeleton to increase the spin-orbit coupling of the system, improve the reverse intersystem crossing rate from the triplet state to the singlet state, and suppress the efficiency roll-off; at the same time, it does not increase the structural relaxation of the molecule, affect the multi-resonance characteristics of the entire system, and maintain the narrow half-width and high luminous efficiency of the system. The organic electroluminescent device prepared in this way overcomes the shortcomings of MR-TADF materials such as serious efficiency attenuation at high brightness, and realizes an organic electroluminescent device with high efficiency, high color purity and low efficiency roll-off, which has an important role in promoting the further popularization of organic electroluminescent technology.

The invention discloses a polycrystalline organic eutectic material as well as a preparation method and application thereof, and belongs to the technical field of organic luminescent materials. According to the invention, a polycrystalline organic eutectic crystal 1-BrTC composed of an electron acceptor TCNB and an electron donor 1-BrDBT is synthesized. And carrying out self-assembly in different crystallization environments to obtain two polycrystalline crystals with obviously different emission colors, which are respectively named as g-eutectic and y-eutectic. Experimental results show that spin-orbit coupling is enhanced through multiple halogen bond effects in the g-eutectic, intersystem crossing and anti-intersystem crossing processes are remarkably accelerated, and thermal activation delayed fluorescence emission is enhanced. Besides thermally activated delayed fluorescence, singlet radiation attenuation and triplet non-radiative transition are inhibited by stronger hydrogen-bond interaction in the y eutectic, and room-temperature phosphorescence emission is realized. A new thought is provided for effective utilization of triplet excitons in the polycrystalline organic eutectic, and reasonable design of a novel luminescent material is facilitated.

The application discloses a metal porphyrin-pyrrolopyrrolidone conjugated compound and a preparation method and application thereof. The compound has the structure shown in the following formula I or formula II: wherein R1 is selected from * represents a connecting position of a carbon-carbon triple bond; represents an aromatic group; R represents an alkyl group; and M represents a heavy metal atom. In the compound structure, the construction of an electron donor-acceptor conjugated system and the introduction of the heavy metal atom can effectively promote intramolecular charge transfer absorption, and due to the heavy metal atom effect, a singlet excited state is converted into a long-lifetime triplet excited state through intersystem crossing, effective triplet excited state absorption is generated, and then the compound has high-performance nonlinear optical material.

The application belongs to the technical field of organic photoelectric materials, and provides a boron-nitrogen-containing multi-heterocyclic material and an organic electroluminescent device containing the same. The boron-nitrogen-containing multi-heterocyclic material provided by the application is a novel sensitization material and a doping material with a boron-nitrogen six-membered heterocyclic ring as a molecular skeleton center and containing a multi-benzene ring structure. The structure has good stability, can inhibit molecular vibration relaxation and reduce non-radiative transition, and thus a better service life is achieved. Meanwhile, the material has good high-exciton utilization and small ΔEST, can more easily realize intersystem crossing, and achieve better photoelectric conversion efficiency.

The present invention provides an organic electroluminescent device, a display panel, and a display apparatus. A light-emitting layer comprises a first compound, a second compound, a third compound, and a fourth compound; the first compound and the second compound form a first exciplex under optical excitation and electric excitation; excitonic energy compounded by the first exciplex can be transferred to the third compound; then the third compound and the second compound are compounded to form a second exciplex; and excitonic energy compounded by the second exciplex can be transferred to the fourth compound. In the excitonic energy transfer process, triplet excitons improve a reverse intersystem crossing process and are converted into singlet excitons to radiate and emit fluorescence when an exciplex is formed by means of compounding; the singlet excitons are effectively used for Forster energy transfer, and Dexter energy transfer is inhibited, such that energy loss is avoided, the excitonic energy is effectively used, and the device efficiency is improved.

The application discloses a kind of thermally activated delayed fluorescence material containing intramolecular hydrogen bond and its application, and belongs to the technical field of electroluminescent material.The material has a large dihedral angle advantage by using six-membered ring donor, introduces nitrogen atom at its 1-position, and through intramolecular hydrogen bond, on the one hand, fine-tunes the dihedral angle between the donor and the acceptor, improves the orbital overlap integral between the electron and the hole, maintains small energy level difference and fast reverse intersystem crossing rate, while improving the radiation transition rate, so as to promote the balance of reverse intersystem crossing rate and radiation transition rate.On the other hand, the rigidity of the molecule is improved to suppress excited state vibration relaxation and improve the light-emitting efficiency.The material of the application has excellent photoelectric performance, and provides an ideal material solution for preparing high-efficiency and low-rolling OLED devices.

The present application belongs to the technical field of organic electroluminescent materials, and particularly relates to a polycyclic double-boron nitrogen compound containing indole and an organic electroluminescent device thereof. By introducing a substituent group to an unsaturated five-membered ring derivative structure in an MR-TADF system containing a double-boron atom, a slight distortion of a molecular skeleton is caused and a moderate steric hindrance is introduced. The molecular distortion and the steric hindrance can weaken the intermolecular π-π stacking effect, thereby inhibiting fluorescence concentration quenching and triplet exciton annihilation; at the same time, the molecular distortion can enhance the spin-orbital coupling effect, improve the conversion efficiency from a triplet state to a singlet state, increase the reverse intersystem crossing rate, and thus realize higher exciton utilization efficiency and smaller efficiency roll-off.