24 results about "Concentration quenching" patented technology

The invention belongs to the technical field of luminescence and display, and particularly relates to a D-A type green light TADF material and application thereof in OLEDs. The luminescent material comprises an oxygen bridge triphenylboron acceptor unit and oxygen bridge triphenylamine which are used as donor units, and a green light TADF material is constructed through simple coupling. The rigid large plane structure of the material limits rotation of a benzene ring, vibration relaxation of a condensed ring structure is reduced, and the photoluminescence efficiency as high as 90% is obtained. Research results show that the maximum emission peak of the device is 518 nm and the maximum external quantum efficiency (EQE) of the device is 37.8% under different doping concentrations when the OLEDs are processed by the solution, especially under the doping concentration of 5-100%, the electrogenerated emission peak change of the device is small, the EQE of 30% or above is kept, the excellent concentration quenching inhibition performance is shown, and the application prospect is attractive.

The invention provides a compound with an electron transmission function, an organic electroluminescent device containing the compound and application of the compound, the structure of the compound takes 9-alkyl-9-phenyl fluorenyl, phenanthryl and a triazine group as main components, the 9-alkyl-9-phenyl fluorenyl is one of core structures, fluorene is a polycyclic aromatic hydrocarbon with better planarity, and the triazine group is one of the core structures. Alkyl and phenyl are introduced to the ninth site to generate strong spatial repulsive force with a fluorene ring, a three-dimensional and non-planar propeller-shaped structure is formed, and the non-planar structure can effectively inhibit close packing of molecules in a solid state, so that concentration quenching and excimer formation caused by pi-pi packing are prevented, and the stability of the fluorescent probe is improved. And moreover, the rigid and non-planar structure can also effectively improve the thermal stability of the material, and the service life of the device is prolonged. The compound provided by the invention is used as an electron transport layer and a hole blocking layer in a light-emitting device, so that the device has low driving voltage, high luminous efficiency and long service life.

The invention provides an erbium-ytterbium ion doped Al2O3-YAG composite ceramic sensing material and a preparation method thereof, and belongs to the technical field of crossing of functional ceramic materials and optical sensing technologies, the erbium-ytterbium ion doped Al2O3-YAG composite ceramic sensing material comprises a matrix phase and doped ions, the matrix phase is Al2O3-YAG (aluminum oxide-yttrium aluminum garnet) composite ceramic; wherein the mass ratio of Al2O3 is 30%-70%, and the mass ratio of YAG is 30%-70%; the doping ions are Er < 3 + > and Yb < 3 + >, and based on the total molar weight of the matrix phase, the doping concentration of Er < 3 + > is 0.5-3 mol%, and the doping concentration of Yb < 3 + > is 5-20 mol%; the sensing material realizes temperature sensing under the excitation of 980 nm laser and on the basis of the energy level emission conditions of 2H11 / 2 to 4I15 / 2 and 4S3 / 2 to 4I15 / 2 of Er < 3 + >. The Al2O3-YAG composite ceramic is used as an Er < 3 + > / Yb < 3 + > doped matrix for optical temperature measurement for the first time, and the high-temperature stability is superior to that of fluorescent powder and glass materials; the mechanical strength and the thermal shock resistance are obviously improved; elements are uniformly distributed, and the concentration quenching effect is avoided.

The invention belongs to the technical field of luminescent materials, and discloses a heavily-doped Eu (II) hybrid metal iodide scintillator and a preparation method and application thereof. The chemical composition formula of the hybrid metal iodide is OrSr (1-v) Eu (II) vI. According to the invention, a glass tube is sintered at a low temperature by using a flame spray gun under the vacuum degree of 10 <-3 >-10 <-5 > Pa through a vacuum sintering process, wherein the raw materials which are ground and mixed uniformly are ground and mixed uniformly. The heavily doped Eu (II) hybrid metal iodide is obtained, the material shows the characteristics of high luminous intensity, good scintillation performance, good concentration quenching characteristic, wide excitation range and the like, and a ceramic wafer prepared through cold pressing sintering can be used in the field of X-ray imaging.

The invention discloses a high-load transparent rare earth complex organic glass scintillator as well as a preparation method and application thereof. The scintillator comprises a polymer matrix and an ionic rare earth complex dispersed in the polymer matrix, the rare earth complex comprises coordination anions and ionic liquid cations, the coordination anions comprise rare earth ions and organic ligands, and the loading capacity of the rare earth complex in the polymer matrix can reach 80-90 wt%. According to the scintillator, an ionic liquid is introduced to construct an ionic supramolecular structure, effective isolation of a luminescence center is realized by utilizing steric hindrance and a charge shielding effect, concentration quenching is inhibited, and compatibility with a matrix is enhanced, so that the material still keeps transparency of 90% or above under an ultrahigh load. The maximum radiation luminous intensity of the scintillator is 23.9 times that of commercial LYSO, the lower detection limit is as low as 56nGy / s, and the scintillator is suitable for the fields of high-energy particle detection, X-ray imaging and the like.

This invention discloses a rare-earth ion co-doped two-dimensional semiconductor material with optimized ratio, its preparation method, and its application, belonging to the field of two-dimensional materials technology. The material is a transition metal chalcogenide WS2 doped with Er. 3+ and Yb 3+ By adjusting the mass ratio of ErCl3 to YbCl3 in the precursor, the Er:Yb doping molar ratio was optimized to 1:4 while maintaining a constant total doping concentration. This invention employs salt-assisted chemical vapor deposition to grow centimeter-scale, uniformly thick WS2 (Er-Yb) monolayer films on sapphire substrates, achieving an overall rare earth doping concentration as high as 10.7 at%. Experiments confirm that when the Er:Yb doping ratio is optimized to 1:4, the Yb... 3+ As a sensitizer, it can effectively absorb photon energy and efficiently transfer it to Er. 3+ The activator significantly enhances energy transfer efficiency and inhibits concentration quenching, enabling the material to exhibit the best photoelectric properties under 635nm illumination.

The invention relates to the technical field of organic photoelectric functional materials, and discloses a full-conjugate carbazolyl pinene chiral tetradentate platinum (II) or palladium (II) complex phosphorescent material as well as a preparation method and application thereof. According to the tetradentate platinum (II) or palladium (II) phosphorescent material disclosed by the invention, a pinene structure with large stereo steric hindrance, a donor carbazolyl structure derivative with anions and different acceptor structure units are introduced, so that the tetradentate platinum (II) or palladium (II) phosphorescent material has a large conjugate plane and a high conjugation degree, and an aggregation state-induced emission enhancement effect is realized; according to the palladium (II) complex phosphorescent material disclosed by the invention, the concentration quenching effect and exciton annihilation caused by long service life are effectively inhibited, and the photoluminescence quantum efficiency of the palladium (II) complex phosphorescent material is improved to the greatest extent, so that the phosphorescent quantum yield of the material is remarkably improved, and the piezo-chromic red shift effect is also realized; the vapor deposition method under specific conditions is applied to the luminescent layer of the electroluminescent device, and has great potential in the aspects of recording, data storage, sensors and the like.

The application provides a compound with an electron transport function, an organic electroluminescent device containing the same and application, the structure of the compound mainly comprises a 9-alkyl-9-phenylfluorenyl group, a phenanthryl group and a triazine group, the 9-alkyl-9-phenylfluorenyl group is one of the core structures, the fluorene itself is a condensed ring aromatic hydrocarbon with good planarity, the alkyl group and the phenyl group introduced at the 9th position generate strong steric repulsion with the fluorene ring itself, forming a three-dimensional, non-planar 'propeller' structure, the non-planar structure can effectively inhibit the close packing of molecules in a solid state, thereby preventing concentration quenching and formation of an excimer caused by pi-pi stacking, achieving higher solid-state light-emitting efficiency, and the rigid, non-planar structure can also effectively improve the thermal stability of the material and improve the service life of the device. The compound of the application can be used as an electron transport layer and a hole blocking layer in a light-emitting device, so that the device has low driving voltage, high light-emitting efficiency and long service life.

The application belongs to the technical field of light emitting and display, and particularly discloses a near-violet thermal exciton luminescent material based on multiple resonance electron donor and acceptor units and application. The luminescent material takes 2,12-di-tert-butyl-5,9-diox-13b-boron naphtho[3,2,1-de] anthracene as an electron acceptor unit, and 2,5-di-tert-butyl indole [3,2,1-jk] carbazole as an electron donor unit. The two rigid MR donor and acceptor units are directly connected through a sigma bond, forming a small-angle dislocation non-coplanar structure, effectively inhibiting concentration quenching and red shift of the luminescent spectrum; meanwhile, the combination of the two MR units promotes the reverse intersystem crossing of the high-level triplet state to the degenerate singlet state (T6→S1 / S2), realizing efficient, narrow spectral band near-violet light emission of the material. The luminescent efficiency of the preferred solution processing organic light emitting device is as high as 12.01%, and has an attractive application prospect.

The application belongs to the technical field of organic electroluminescent materials, and particularly relates to a polycyclic double-boron-nitrogen compound and an organic electroluminescent device thereof. The multiple resonance skeleton of the compound is annelated with a tetramethyl-containing ring to form a three-dimensional structure, which increases the intermolecular distance and prevents the intermolecular close packing, so that the compound can inhibit the fluorescence concentration quenching and the triplet exciton annihilation. Based on the above effects, when the compound is applied in the electroluminescent device, the maximum external quantum efficiency of the device can be improved, and the attenuation of the device efficiency under high brightness caused by the triplet exciton annihilation can be reduced. In addition, the anti-aggregation feature can improve the service life of the device.

The present invention discloses a lanthanum-cerium-europium composite sensitized rare earth light conversion functional material, a preparation method thereof and an application thereof, belonging to the technical field of rare earth functional materials; the chemical composition of the light conversion functional material is (Eu 0.1 Ce x La （0.9‑x） )(TTA)3(Phen), where 0 < x ≤ 0.1, and preferably x = 0.001. In the present invention, Eu 3+ is used as the luminescence center, Ce 3+ is used as the sensitizer, and ultraviolet light is efficiently absorbed through the 4f-5d allowed transition and the energy is resonantly transferred to Eu 3+ , La 3+ is used as an inert matrix to increase the Eu 3+ ion spacing to inhibit concentration quenching, and TTA and Phen form a double ligand system to form an octahedral coordination structure to improve the thermal stability. The present invention solves the technical problems of weak ultraviolet absorption, serious concentration quenching, poor thermal stability and poor compatibility with the matrix of the existing light conversion functional materials, and can be used in the fields of optical devices, luminescence markers and agricultural light conversion films, etc.

The application provides a di-tert-butyl aniline donor-based organic heat delayed fluorescence material and a preparation method, belongs to the technical field of organic light-emitting diodes, and takes di-tert-butyl aniline donor as a core to synthesize three kinds of organic heat delayed fluorescence materials; the acceptor group R adopted in the application has strong rigidity, can effectively inhibit non-radiative transition of molecules, improve the efficiency of an organic electroluminescent device, and introduce a tert-butyl group on the di-tert-butyl aniline donor, so that the spatial steric hindrance of the molecules can be improved, concentration quenching caused by molecular stacking can be inhibited, and the emission efficiency of the device can be improved; in addition, the acceptor group R has strong electron-withdrawing capacity, and the combination of the tert-butyl group can make the luminescence wavelength of the organic electroluminescent device red-shift, realize orange-red light / red light emission, and has high external quantum efficiency, and the highest external quantum efficiency can reach 11.7%, has an optimistic application prospect, and is expected to be widely applied in the fields of illumination and display.

A light emitting device, a display substrate and a display device, relate to the technical field of displaying. The light emitting device including: a plurality of luminescent layers, wherein each of the plurality of luminescent layers includes at least one subject sublayer and at least one object sublayer, and the at least one subject sublayer and the at least one object sublayer are disposed alternately; wherein thicknesses of at least a part of subject sublayers are greater than or equal to a thickness of the object sublayer. The concentration quenching phenomenon of the luminescent layer in the light emitting device is improved, the luminous efficiency is improved, and the service life of the device is extended.

The invention is applicable to the technical field of inorganic luminescent materials, and provides an Eu and W co-doped fluorescent powder material and a preparation method and application thereof, the chemical general formula of the Eu and W co-doped fluorescent powder material is Ca2AlNbO6: 0.18 Eu < 3 + >, xW < 6 + >, 0 < x < = 0.05; the excitation spectrum coverage range under the condition of monitoring the emission wavelength of 615 nm is 250-510 nm, and the emission main peak is located at 615 nm; when x is equal to 0.02, the quantum efficiency under the excitation of 396nm ultraviolet light is gt; and 98%. According to the invention, Ca2AlNbO6 double perovskite is taken as a matrix, through a Eu < 3 + > and W < 6 + > co-doping cooperative regulation strategy, a lattice field environment and an energy transfer path are optimized, so that the fluorescence intensity, the quantum efficiency and the thermal stability are synchronously and greatly improved, meanwhile, the wide-spectrum excitation characteristic and the excellent concentration quenching resistance are maintained, ideal red fluorescent powder is provided for a high-performance white light LED device, and the application prospect is wide. The method is widely applied to the field of anti-counterfeiting mark and fingerprint acquisition.

The invention provides a Yb < 3 + > / Er < 3 + > co-doped glass material based on fluorescence intensity ratio temperature measurement. The Yb < 3 + > / Er < 3 + > co-doped glass material comprises 20.00 to 25.00 wt% of SiO2, 6.00 to 7.00 wt% of AlF3, 28.00 to 35.00 wt% of BaF2, 6.00 to 13.00 wt% of BaO, 18.00 to 24.00 wt% of Gd2O3, 0.50 to 3.00 wt% of Er2O3 and 3.00 to 5.00 wt% of Yb2O3, and the sum of the components is 100 wt%. The co-doped glass material can effectively inhibit concentration quenching and improve the luminous efficiency, and the glass matrix and doped rare earth elements can synergistically optimize the physical properties of the glass material and significantly improve the luminous intensity, efficiency and stability of Er < 3 + >.

The present application relates to the technical field of organic photoelectric material, and particularly relates to a boron-nitrogen compound and application thereof. By introducing a group containing a triphenyl silicon steric group, the planar configuration of the group is twisted, and R1-R7 groups are introduced to further separate the distance between molecules, so as to weaken the adverse effect of concentration quenching effect on efficiency. When the boron-nitrogen compound of the present application is used as a light-emitting material in an OLED device, especially as a blue light doping material, the device can exhibit excellent performance and stability.

The invention belongs to the technical field of inorganic luminescent materials, and particularly discloses Bi < 3 + > sensitized Y3Ga3MgSiO12: Eu < 3 + > dark red fluorescent powder as well as a preparation method and application thereof. The fluorescent powder is prepared by adopting a high-temperature solid-phase method, and efficient capture of near ultraviolet / purple light energy and dark red emission output are realized by introducing Eu < 3 + > as a luminescence center and co-doping Bi < 3 + > as a sensitizer on the premise of keeping stability of a garnet type cubic structure (space group Ia3d). The luminescent mechanism is as follows: under the excitation of near ultraviolet / purple light, a matrix and Bi < 3 + > generate stronger absorption at the wave bands of 250-320 nm and the like and form an energy capture channel, and the obtained energy is further transferred to the energy level of Eu < 3 + >, so that Eu < 3 + > generates characteristic radiation transition and generates dark red emission taking 708 nm as a main peak, and meanwhile, narrow-band emission of 593 nm, 609 nm, 629 nm, 651 nm, 695 nm and the like is accompanied; by optimizing the doping concentration, concentration quenching can be effectively inhibited, the luminous intensity can be improved, the optimal doping amount of Eu < 3 + > is about 10 mol%, and the optimal sensitization amount of Bi < 3 + > is about 4 mol%. The fluorescent powder keeps stable dark red output on chromaticity coordinates, can be matched with near ultraviolet / purple light LED chips, and is suitable for the fields of illumination and the like.

The invention relates to the technical field of photoelectric materials and scintillators, and particularly discloses ionic rare earth complex scintillator glass as well as a low-temperature melting preparation method and application thereof. According to the invention, a low-temperature melting and quenching process is developed, the crystalline ionic europium complex is directly melted and rapidly cooled under a solvent-free condition, and direct preparation of the ionic rare earth complex transparent scintillator glass is realized. The prepared glass scintillator material has high transparency, high luminous efficiency, high rare earth content and excellent machinability, light scattering caused by particle aggregation and phase separation in a traditional composite film is fundamentally eliminated, and the concentration quenching limitation is broken through. The glass scintillator material shows excellent luminescence performance under X-ray excitation, and the imaging resolution and the detection sensitivity can be remarkably improved. The invention provides a feasible technical path for the development of a novel rare earth scintillator material, and has important application prospects in the fields of medical imaging, nondestructive testing, high-energy radiation detection and the like.

The invention provides a green phosphorescent doped material and a preparation method and application thereof, the green phosphorescent doped material has a structure shown in a chemical formula I. According to the green phosphorescent doped material, a platinum-containing ONCN tetradentate ligand structure is introduced, the stability of a compound can be effectively improved, and a trifluoromethyl substituted phenyl structure is further connected, so that the stability of the compound is improved. Energy level and charge transfer are optimized through a strong electron withdrawing effect, the stability of the material is improved and concentration quenching is inhibited through large volume and chemical inertness, high-efficiency, high-color-purity and high-stability green light emission is realized, the thermal stability and film-forming property of the material are improved, and a device which is lower in driving voltage, higher in luminous efficiency and longer in service life is obtained.

The application belongs to the field of organic electroluminescent materials, and particularly discloses a boron-containing multiple resonance type thermally activated delayed fluorescence material and an organic electroluminescent device. The material adopts a single spiro carbon locking structure, restricts MR mother nucleus conformation vibration by means of a spiro carbon covalent bridge, suppresses excited state relaxation, narrows a spectrum, reduces non-radiation transition, and improves fluorescence quantum efficiency. A vertical three-dimensional spiro ring generates steric hindrance, suppresses intermolecular π-π stacking, relieves aggregation and concentration quenching, and is suitable for wide doping concentration. The spiro carbon condensed ring improves the thermal stability of the molecule, prevents film crystallization and phase separation, improves the stability of the film layer, and prolongs the service life of the device. Compared with a double spiro carbon structure, the single spiro carbon breaks the center symmetry of the mother nucleus, realizes asymmetric separation of the front orbital, reduces the single triplet energy level difference, accelerates the reverse intersystem crossing, and improves the device efficiency and service life under large current.

The present application relates to a kind of europium doped germanate red fluorescent powder and preparation method, and europium doped germanate red fluorescent powder is prepared from lithium carbonate, sodium carbonate, germanium oxide and europium oxide, and the molar ratio of raw material is 1:1:8:(0.025 to 0.1), and the structural formula is LiNaGe4O9:xEu 3+ The preparation method is to add solid-phase reaction raw materials to ethanol to grind, and dry precursor mixed powder is obtained by natural air drying in air;The precursor mixed powder is placed in a tube furnace, heated to 800 DEG C at 5 DEG C / min, and calcined for 8 hours;After the product is naturally cooled to room temperature with the tube furnace, the finished product is obtained by grinding, the present application provides an asymmetric coordination environment using the flexible network structure of germanium-oxygen tetrahedron, reduces the matrix phonon energy through the strong covalence of germanium-oxygen bond, suppresses non-radiative transition and concentration quenching by combining the doping concentration within the defined interval, and improves the quantum efficiency and red light emission intensity of fluorescent powder.

The application discloses a high-color-rendering-index low-quenching nitride fluorescent ceramic for a white LED and a preparation method thereof. The fluorescent ceramic has a general chemical formula of (Lu 0.98‑x La x )3(Al 1‑y Si y )5(O 1‑ y N y ) 12 :0.06Ce, wherein x is the molar percentage of La 3+ doping Lu 3+ , y is the molar percentage of Si 4+ doping Al 3+ , or the molar percentage of N 3‑ doping O 2‑ , 0.001<=x<=0.12, 0.001<=y<=0.02. The preparation method comprises the following steps: firstly, weighing raw material powders; secondly, adding sintering aids and dispersants to prepare mixed slurry; thirdly, drying, sieving and calcining the mixed slurry to obtain a green body through dry pressing and cold isostatic pressing; and finally, high-temperature sintering and double-side polishing are sequentially performed to obtain the fluorescent ceramic. The method is simple in process, can reduce energy consumption and cost, and the obtained fluorescent ceramic has the advantages of high color rendering index, low concentration quenching and low heat quenching.

The invention discloses a LiNbO3-based material with enhanced red and high-penetration near-infrared mechanical luminescence properties as well as a preparation method and application thereof, and relates to the technical field of luminescent materials. The chemical formula is LiNbxTa (1-x) O3: 0.03 Pr, 0.01 Zn, and x is more than or equal to 0.5 and less than 1. By doping the Ta element, the local lattice distortion is regulated and controlled, the coordination environment of a Pr < 3 + > luminescence center is optimized, and the concentration quenching point of Pr < 3 + > is obviously delayed, so that Pr < 3 + > with higher concentration can be effectively activated without generating non-radiative cross relaxation enhancement, and synchronous enhancement of red and near-infrared mechanical luminescence is realized; the material has high brightness and deep tissue penetrating power, and a high-performance near-infrared mechanical luminescent material is provided for deep tissue biomechanical sensing.

The application discloses a glass ceramic dental crown and a preparation method thereof, and relates to the technical field of glass ceramic dental crown. The preparation method adopts lithium disilicate as a base material, and is combined with rare earth doped hydroxyapatite and functional crystals. By accurately controlling the synergistic ratio of each component, the unity of mechanical properties, biological adaptability and aesthetic effect is realized. The rare earth doped hydroxyapatite is prepared by a hydrothermal precipitation method, the dispersion effect of trisodium citrate is used to inhibit particle agglomeration and promote the interface combination with human hard tissues; and the rare earth doped fluorescent powder is used to construct monodisperse light emitting centers by controlling a rare earth ion doping process, so that concentration quenching is avoided, and the fluorescent properties close to natural teeth are given to the dental crown.