8results about How to "Short fluorescence lifetime" patented technology

The invention discloses a preparation method and application of a spirofluorenylgrignarene blue-light-emitting material, a spirofluorenylgrignarene fluorescent material molecule G [2] SBF-TFBZ is synthesized by adopting a C-H bond activation gridding method, and the optimal reaction conditions are as follows: palladium acetate Pd (OAc) is used as a catalyst, tri-tert-butylphosphine tetrafluoroborate PtBu2Me-HBF4 is used as a ligand, potassium carbonate is used as alkali, N, N-dimethylacetamide DMAc is used as an organic solvent, and the reaction temperature is 30-60 DEG C, so that the spirofluorenylgrignarene blue-light-emitting material is obtained. Reacting at 120 DEG C for 48 hours, wherein the reaction concentration is 10mmol. L <-1 >; oLED preparation is carried out in the future by adopting a vacuum evaporation technology. According to the specific device structure, ITO serves as an anode, HAT-CN serves as a hole transport layer, TAPC / TcTa / mCP serves as an injection layer, G [2] SBF-TFBZ and [3] TFBZ-[2] SBF serve as light emitting layers respectively, and the test results are as follows: the maximum emission wavelengths of G [2] SBF-TFBZ and [3] TFBZ-[2] SBF are 417 nm and 444 nm respectively, the maximum external quantum efficiency EQEmax is 1.85% and 0.41% respectively, the turn-on voltage of G [2] SBF-TFBZ is 3.9 V, the maximum brightness is 380.7 cd.m <-2 >, and the corresponding current density is 197.1 mA. Cm <- And the turn-on voltage of the [3] TFBZ-[2] SBF is 4.3 V, and the corresponding current density is 187.3 mA. Cm <-2 >. Compared with [3] TFBZ-[2] SBF, the G [2] SBF-TFBZ has stronger brightness and more excellent efficiency and performance.

The invention provides a carbonized polymer / cellulose nanocrystal composite material with high-efficiency circularly polarized light emission and phosphorescence emission as well as preparation and application of the carbonized polymer / cellulose nanocrystal composite material. The preparation method of the composite material comprises the following steps: fully dispersing polyethylene glycol, rhodamine B and a hydrochloric acid aqueous solution in water, carrying out hydrothermal reaction, filtering, dialyzing, concentrating and freeze-drying to obtain a red light carbonized polymer; and fully dispersing the red light carbonized polymer in a cellulose nanocrystal aqueous solution, and drying to obtain the carbonized polymer / cellulose nanocrystal composite material with high-efficiency circular polarization luminescence and phosphorescence emission. The preparation method is simple, and raw materials are cheap, easy to obtain, green and environment-friendly; the obtained composite material is a composite film, the mechanical strength is greatly improved, efficient red circular polarization luminescence is shown, and an extremely high asymmetry factor value is achieved; meanwhile, the composite film realizes room-temperature phosphorescence emission, the fluorescence lifetime is greatly prolonged, and obvious long afterglow emission is observed under the room-temperature condition.

The application belongs to the technical field of photocatalytic nano antibacterial materials, and discloses a preparation method and application of artemisia carbon dot modified crystalline carbon nitride material. The material is composed of A-CDs and CCN, A-CDs retains the biological activity functional groups of artemisia and is uniformly modified in the interlayer of CCN. The preparation method comprises the following steps: preparing CCN solid and A-CDs powder respectively, then dispersing the two in deionized water, adjusting pH, and then performing ultrasonic dispersion, drying, grinding and staged calcination treatment, so as to obtain A-CDs@CCN material. The application improves the charge separation efficiency by embedding A-CDs in the interlayer of CCN, realizes the synergistic antibacterial effect of A-CDs and CCN, has high inhibition activity on staphylococcus aureus and escherichia coli, and is not easy to induce drug resistance. The preparation process is simple, the raw material cost is low, the obtained material is uniform in composition and stable in structure, and can be used in the field of antibacterial.

The present invention relates to the technical field of electronic materials, and in particular to a metal complex and an organic electroluminescent device. The metal complex provided by the present invention has a structure as shown in Formula I: The metal complex provided by the present invention can reduce device roll-off, which is conducive to the preparation of a metal complex of a high-stability OLED device, and the metal complex is applied to an organic electroluminescent device, and the luminescent color can be adjusted and the luminescent efficiency is high.

This invention provides a siloxane ligand-protected Ag 40 Nanoclusters, their synthesis methods, and applications. This invention relates to Ag protected by siloxane ligands. 40 Nanoclusters are composed of RC≡C ‑ and (Ph 4 Si 4 O 8 ) 4‑ Ag protected by both ligands 40 Nanoclusters, with the molecular formula {Ag} 40 [(RC≡C) 8 (Ph 4 Si 4 O 8 ) 6 The silver nanoclusters synthesized in this invention have precise atoms and novel structures; the synthesis method is simple, easy to operate, mild under mild conditions, and the raw materials are readily available, making it potential for industrial and commercial production; the obtained silver nanoclusters exhibit superior fluorescence performance at low temperatures and have a long fluorescence lifetime, making them practically valuable in the field of fluorescent probes and worthy of market promotion.

The present invention relates to a mid-infrared holmium, praseodymium, calcium, magnesium, zirconium co-doped gadolinium, gallium, garnet laser crystal and a preparation method and application thereof, belonging to the technical field of single crystal or uniform polycrystalline materials with a certain structure. The mid-infrared holmium, praseodymium, calcium, magnesium, zirconium co-doped gadolinium, gallium, garnet laser crystal of the present invention comprises a matrix crystal, activation ions, deactivation ions and auxiliary ions; the matrix crystal is a gadolinium, gallium, garnet crystal, the activation ions are Ho 3+ , the deactivating ion is Pr 3+ , the auxiliary ions include at least Ca 2+ Mg 2+ and Zr 4+ ; the Pr 3+ The doping concentration is ≥0.05at%. The mid-infrared holmium, praseodymium, calcium, magnesium, zirconium co-doped gadolinium, gallium, garnet laser crystal has a low laser threshold, high laser output power and efficiency.

The invention discloses a technology for reducing the fluorescence lifetime of Y2SiO5: Ce < 3 + >. In order to reduce the response time of Y2SiO5: Ce < 3 + >, rare earth ions Ho < 3 + > are introduced, and the method is realized by creating an additional excitation channel to improve the transition probability from an excited state to a ground state and embedding an additional acceptor center. The acceptor can interact with the donor through multipolar electromagnetic interaction or exchange interaction over a time scale comparable to the donor radiation lifetime, and excitation energy is transferred in a non-radiative manner between the donor and the acceptor, resulting in faster decay. The fluorescent powder prepared by the invention has very low fluorescence lifetime which is less than 5ns, and can be applied to special occasions such as rapid imaging.

The application provides a carbonized polymer / cellulose nanocrystal composite material with efficient circularly polarized luminescence and phosphorescence emission and a preparation method and application thereof.The preparation method of the composite material comprises the following steps: dispersing polyethylene glycol, rhodamine B and hydrochloric acid aqueous solution in water, performing hydrothermal reaction, and then performing filtration, dialysis, concentration and freeze-drying to obtain red light carbonized polymer; and dispersing the red light carbonized polymer in a cellulose nanocrystal aqueous solution and drying to obtain the carbonized polymer / cellulose nanocrystal composite material with efficient circularly polarized luminescence and phosphorescence emission.The preparation method is simple, raw materials are cheap and easy to obtain, and the method is green and environment-friendly; the composite material obtained by the application is a composite film, the mechanical strength of which is greatly improved, the composite film exhibits efficient red circularly polarized luminescence and has a very high asymmetric factor value; meanwhile, the composite film realizes room temperature phosphorescence emission, the fluorescence lifetime is greatly increased, and obvious long afterglow emission is observed under room temperature conditions.