12 results about "Excited singlet" patented technology

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.

According to the phenothiazine functional precursor, the photosensitizer and the preparation method of the phenothiazine functional precursor, halogen or thienyl is introduced into R1 and / or R2 sites of a benzophenothiazine structure to serve as heavy atoms on the basis of structure-function relationship research of benzophenothiazine site modification, generation of strong spin-orbital coupling can be promoted, and the photosensitizer has the advantages that the photosensitizer can be used as a photosensitizer; further, intersystem crossing of the phenothiazine photosensitizer from an excited singlet state (S1) to a triplet state (T1) is promoted, so that the photosensitive effects of the phenothiazine functional precursor and the corresponding phenothiazine photosensitizer are effectively improved. Besides, after the phenothiazine photosensitizer is modified by adding a tetrazine group, controllable closing and opening of phenothiazine are realized, so that the dark toxicity of phenothiazine is effectively reduced, the targeting property and the treatment effect of the photosensitizer are improved by accessing a targeting group and a drug group into the phenothiazine photosensitizer, and the phenothiazine photosensitizer has a wide application prospect.

To provide an organic light-emitting device with excellent color purity. 【Solution means】The light-emitting layer contains a first compound and a second compound. The first compound is a compound having a luminescence lifetime of 500 [nsec] or more, or a difference between the lowest excited singlet energy and the lowest excited triplet energy of 0.25 [eV] or less. The second compound is a fluorescent light-emitting material. An organic light-emitting device characterized by satisfying the following formula [1]. 8000≦(S1(A)-E(λ max ))×ε [1] S1(A) [eV]: The lowest excited singlet energy of the first compound λ max [nm]: The absorption peak wavelength located on the longest wavelength side among the absorption spectra of the second compound E(λ max ) [eV]: The energy corresponding to λ max ε [M -1 ·cm -1 : The molar absorption coefficient of the second compound at λ max [nm]

The present invention discloses a class of aggregation-induced luminescence charge-type free radical photosensitizers and their preparation methods and antibacterial applications, and belongs to the technical field of photosensitizers and antibacterial materials. The present invention introduces a mobile electron donor into the molecular structure of the photosensitizer, constructs a strong charge transfer (CT) state, and suppresses the intermolecular π-π stacking effect of the molecules in the aggregated state, thereby giving the material significant aggregation fluorescence enhancement properties. And introduce an electron acceptor into the molecular structure, thereby strengthening the CT state of the product. In addition, due to the strong degree of distortion between the electron donor-acceptor, it is beneficial to separate the highest occupied orbital and the lowest unoccupied orbital of the molecule, thereby achieving a smaller singlet-triplet energy level difference, promoting the excited singlet energy gap to cross to the triplet state to achieve efficient ROS generation. At the same time, due to the limited molecular aggregation motion, non-radiative excitation energy is effectively suppressed, prompting energy to dissipate energy in the radiation transition pathway, and fluorescence efficiency is increased.

The invention discloses a coumarin modified fluorescent organic silicon pressure-sensitive adhesive based on click reaction and a preparation method thereof, and relates to a coumarin modified fluorescent organic silicon pressure-sensitive adhesive and a preparation method thereof. The invention aims to solve the problem of poor adhesion performance of the existing organic silicon pressure-sensitive adhesive. The organic silicon pressure-sensitive adhesive can be simply, conveniently and effectively synthesized through cross-linking and thermocuring of a click reaction between vinyl in the vinyl silicone resin and sulfydryl on the coumarin modified mercaptopropyl silicone rubber, and the coumarin forms a rigid fused ring conjugated pi electron system due to benzo alpha-pyrone mother nucleus of the coumarin, so that the organic silicon pressure-sensitive adhesive can be used for preparing the organic silicon pressure-sensitive adhesive. After coumarin molecules absorb ultraviolet light, pi electrons in a conjugated system are transited to a high-energy excitation singlet state and then rapidly relaxed to the lowest excitation singlet state through internal conversion and vibration relaxation, and part of energy is dissipated as heat energy in the process; finally, the molecules in the lowest excitation singlet state release energy in a radiative transition mode to return to the ground state, and fluorescence is generated. The invention belongs to the technical field of pressure-sensitive adhesive preparation.

The application relates to a high-efficiency narrow-spectrum organic electroluminescent material and application thereof in preparation of an electroluminescent device, and belongs to the technical field of organic electroluminescent materials. The organic electroluminescent material is prepared by a concept design of C=O / N rigid skeleton, is a large steric hindrance protected fluorescent material, is used as a doping material in combination with other host materials, and is used for preparing a light-emitting layer of an organic electroluminescent device. The prepared device has the advantages of narrow working spectrum and high efficiency. When the compound of the application is used as a light-emitting layer guest material, the device has the performances of low working voltage, high efficiency, narrow spectrum and long service life. Since the compound has large rigidity, vibration coupling of a ground state and a first excited singlet state and excitation state structure relaxation are inhibited, spectrum widening and fluorescence quantum yield (PLQY) reduction are caused, large steric hindrance protection is avoided, and aggregation quenching and spectrum widening under high voltage are avoided.

The organic light emitting element having a light emitting layer containing the first to fourth organic compounds satisfying the following formulae has a long light emitting life and is stable. The second organic compound is a delayed fluorescence material, and the light emission amount from the fourth organic compound is the largest.E S1 represents the lowest excited singlet state energy, E T1 represents the lowest excited triplet state energy.E S1 (1) > E S1 (4) > E S1 (2) > E S1 (3), E T1 (1) > E T1 (2) > E T1 (3) > E T1 (4).

The invention relates to a preparation method and application of a TTA-UC type photoinitiator with a polyhedral oligomeric silsesquioxane skeleton, and belongs to the technical field of photoinitiators. The photosensitizer absorbs photons to an excited singlet state, reaches a triplet state through intersystem crossing and then transfers energy to the annihilation agent grafted to POSS through triplet-triplet energy, the annihilation agent is subjected to up-conversion and then transfers energy to the photoinitiator, the photoinitiator is cracked to generate free radicals, and free radical polymerization is initiated. The design of the photoinitiator is based on TTA-UC and POSS-SH8, 9, 10-diphenyl anthracene and 2, 4, 6-trimethylbenzoyl phenyl ethyl phosphonate are modified to obtain double bonds DPA and TPO-L, and the double bonds DPA and TPO-L are subjected to reaction grafting with the POSS-SH8 through thiol-ene click. According to the POSS-SH8, an annihilation agent and a photoinitiator are covalently linked to regulate and control the molecular spacing, so that the energy transfer efficiency is improved; when being compounded with a photosensitizer for use, the photosensitizer can be excited under a visible light or near-infrared light source; the sulfydryl in the POSS-SH8 can consume oxygen and form an oxygen barrier layer to isolate air, and shows good initiation efficiency in experiments.

The present invention describes electronic devices and compositions that can be used in electronic devices, the electronic devices including a sensitizer and a fluorescent emitter, wherein the sensitizer is a phosphorescent compound and wherein at least one of the two following conditions (I) or (II) must be satisfied, it being preferable when condition (I) is satisfied:S1K(FE)−S1K(S)≥X  (I)S1max(FE)−S1max(S)≤Y  (II)wherein, e.g., X, Y are each −0.5 eV; S1K(FE) is the energy of the first excited singlet state of the fluorescent emitter; S1K(S) is the energy of the first excited state of the sensitizer; S1max(FE) is the energy of the first excited singlet state of the fluorescent emitter; S1max(S) is the energy of the first excited state of the sensitizer; and wherein the photoluminescence spectra of the sensitizer and of the fluorescent emitter are determined at room temperature.

An organic light emitting device having a light emitting layer that contains a delayed fluorescent material having a difference between PBHT(Tn) and PBHT(T1) of 0.01 or more has excellent durability. PBHT(T1) represents the PBHT of the lowest excited triplet state of a delayed fluorescent material, and PBHT(Tn) represents the PBHT of an excited triplet state having the smallest energy among excited triplet states having larger energies than the lowest excited singlet energy of the delayed fluorescent material.

An organic light-emitting element characterized in that: a light-emitting layer contains a first compound and a second compound; the first compound has an emission lifetime of at least 500 [nsec] or has a difference between the lowest excited singlet energy and the lowest excited triplet energy of at most 0.25 [eV]; the second compound is a fluorescence material; and the organic light-emitting element satisfies expression [1].　[1] 8000≤(S1(A)-E(λmax))×ε, where S1(A) [eV] is the lowest excited singlet energy of the first compound, λmax [nm] is the absorption peak wavelength located most toward the longer wavelength side in the absorption spectrum of the second compound, E(λmax) [eV] is the energy corresponding to λmax, and ε [M-1·cm-1] is the molar absorption coefficient of the second compound at λmax [nm]

An organic electroluminescent device having a cathode and an anode and an organic light-emitting layer interposed between the two electrodes, and the light-emitting layer contains organic molecule I, organic molecule II and organic molecule III, wherein the organic molecule I is a host material, the organic molecule II is a sensitizing material, the organic molecule III is a light-emitting material, and the organic molecule I, the organic molecule II and the organic molecule III satisfy the condition represented by the following formula (A), Formula (A): E S1 (I) > E S1 (II) > E S1 (III) in the above formula (A), E S1 (I) represents the lowest excited singlet state energy level of the organic molecule I, E S1 (II) represents the lowest excited singlet state energy level of the organic molecule II, E S1 (III) represents the lowest excited singlet state energy level of the organic molecule III.