9 results about "Singlet exciton" patented technology

The invention discloses an aggregation-induced emission photosensitizer as well as a preparation method and application thereof. A D-A-pi-A-D symmetrical structure is adopted, the spatial effect and the conjugation degree are adjusted through a pi bridge, the molar absorption coefficient is increased, and singlet excitons are increased; and furthermore, a pyridine ring with positive charges is used for accelerating electron transfer, the yield of triplet excitons and ROS is improved, compared with a traditional photosensitizer, the ROS efficiency is improved by 2-3 times, the efficient killing capability of the photosensitizer on pathogens can be ensured, and a guarantee is provided for rapid healing of infectious wounds. A pyridine ring with positive charges is introduced into an MTCNPy molecule, and the targeting property of the photosensitizer to pathogens is enhanced by utilizing the electrostatic interaction between the pyridine ring and a bacterial negative charge cell membrane, so that the damage to surrounding healthy tissues is reduced. The preparation process is simple, the cost is low, and the hydrogel has excellent hydrophilicity and biocompatibility so as to be more suitable for the biological environment.

The invention relates to the technical field of display, in particular to an organic light-emitting device capable of regulating and controlling a CoPc spin state and a method for adjusting exciton distribution of the organic light-emitting device. According to the organic light-emitting device capable of regulating and controlling the spin state of CoPc, CoP is included in the light-emitting layer, Co < 2 + > in CoPc is induced to be converted from a low spin state to a high spin state through a magnetic field (50-300 mT) and a temperature (145-295 K), exchange interaction is enhanced, triplet state-triplet state annihilation (TTA) is promoted, the singlet state exciton proportion is increased to 25.17% from 25.00%, regulation and control of exciton distribution are achieved, and the organic light-emitting device capable of regulating and controlling the spin state of CoPc can be applied to the field of organic light-emitting devices. In addition, by controlling the magnetic field and the temperature, the amplitude of magnetoelectroluminescence MEL is increased by 43%, and the material is suitable for the field of flexible optoelectronic devices and has important application value.

The invention relates to a TOPCon battery and a preparation method thereof.According to the TOPCon battery, a singlet fission layer is arranged on an aluminum oxide passivation layer of a battery piece, high-energy singlet excitons can be generated after high-energy photons are absorbed, the high-energy singlet excitons are converted into two triplet excitons, the short-circuit current of the battery piece can be increased, meanwhile, heat loss is not caused, and the efficiency of the battery piece is improved. And the conversion rate of the battery piece can be improved. In addition, a sulfanyl compound is introduced into the pentacene singlet fission layer, so that the stability and singlet fission performance of the singlet fission layer can be improved. Besides, the ultrathin passivation layer containing hafnium oxynitride is arranged below the singlet fission layer, so that the singlet fission performance of the singlet fission layer can be promoted, and a silicon semiconductor can be prevented from being passivated.

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 composition for an organic light emitting diode and application thereof. The composition comprises a TADF material and a triplet exciton releasing agent; wherein the triplet exciton energy of the triplet exciton releasing agent is less than the triplet exciton energy of the TADF material, the singlet exciton energy of the triplet exciton releasing agent is greater than the singlet exciton energy of the TADF material, and the decay lifetime of the triplet exciton of the triplet exciton releasing agent is less than the decay lifetime of the triplet exciton of the TADF material. The application can improve the efficiency decay and improve the lifetime of the organic light emitting diode.

The invention relates to the technical field of organic electroluminescent materials, in particular to an exciplex and electroluminescent application thereof, and the exciplex comprises a P-type material and an N-type material. The films formed by the P-type material and the N-type material are stacked or blended to form an exciplex. The singlet state energy and the triplet state energy of the exciplex are close to each other, the exciplex with a narrow band gap is directly electrically excited, formed triplet state excitons are transmitted to the host material, TTA is generated on the host material to generate singlet state excitons, and blue light is emitted. And a low-energy triplet state is converted into a high-energy singlet state through TTA, so that the turn-on voltage and the driving voltage can be reduced, the current efficiency is improved, the service life is prolonged, and the material can be well applied to the technical field of electroluminescence.

The application relates to the technical field of organic electroluminescence, and specifically discloses a thermally activated delayed fluorescence material based on heavy atom effect and application thereof. The material introduces heavy atoms in a molecular structure, uses the heavy atom effect to enhance spin-orbital coupling, effectively reduces the singlet-triplet energy gap of the thermally activated delayed fluorescence material, is beneficial to improving the reverse intersystem crossing rate, promotes the efficient conversion of triplet excitons into singlet excitons, and realizes the full utilization of excitons. Application approaches include: as a light-emitting layer material, an organic electroluminescent device is prepared through a wet process such as spin coating, inkjet printing or blade coating, or is used in the fields of organic lasers, biological imaging probes and sensors. Compared with the prior art, the material has a smaller singlet-triplet energy level difference and higher luminescent efficiency, can realize efficient and stable electroluminescence in a non-doped or doped device, significantly improves the external quantum efficiency and service life of the device, and has a broad application prospect.

This invention provides an OLED device and an electronic device. The OLED device includes an anode, a cathode, and a light-emitting layer disposed between the anode and the cathode. Multiple light-emitting sublayers include: a first light-emitting sublayer configured as the main recombination region of electrons and holes; and a second light-emitting sublayer disposed adjacent to the first light-emitting sublayer. The triplet energy level of the host material in the second light-emitting sublayer is lower than that in the first light-emitting sublayer, causing triplet excitons generated in the first light-emitting sublayer to migrate to the second light-emitting sublayer. The second light-emitting sublayer is used to induce triplet-triplet annihilation of the migrated triplet excitons to generate singlet excitons. The OLED device of this invention, by setting multiple light-emitting sublayers to form an energy level gradient, guides the directional migration of triplet excitons, achieving spatial separation of excitons and polarons and local convergence of triplet excitons, thereby improving luminous efficiency by more than 10% and extending lifespan by more than 10%.

This invention provides a light-emitting layer comprising: a TADF material, a phosphorescent material, a multi-resonance fluorescent material, and a host material. The addition of the phosphorescent material to the light-emitting layer enables it to receive triplet excitons, which can then be transferred to the singlet energy levels of the multi-resonance fluorescent material, reducing the number of triplet excitons within the device and improving its lifetime. The multi-resonance fluorescent material can convert triplet excitons into singlet excitons while receiving a small number, improving the device's efficiency. Due to the dual quenching effect of the phosphorescent material and the multi-resonance fluorescent material on the TADF material, the luminescence of the TADF material can be completely suppressed, improving the stability of the emission spectrum. This invention also provides a light-emitting device and a light-emitting apparatus.