225 results about "Electroluminescence spectra" patented technology

The invention relates to a electro luminescent blue fluorene polymer with stable optical spectrum, preparation and application thereof. Backbone chain of the inventive polymer has a fluorene structural unit and a sulfurous anhydride fluorene structural unit. The preparation includes steps of preparing sulfurous anhydride fluorene monomer and Suzuki coupling polymerization. Electro luminescence optical spectrum stability is improved by introducing sulfurous anhydride structural unit into backbone chaine of poly fluorenes, so as to obtain a novel poly fluorenes blue optic material. Obtained blue electroluminescent poly fluorenes conjugated polymer with sulfurous anhydride fluorene structural unit has good optical spectrum stability.

An organic light-emitting element includes a first electrode, a second electrode, and at least one organic compound layer disposed between the first electrode and the second electrode. The organic compound layer includes a light-emitting layer containing a light-emitting material and being configured to emit light toward the first electrode and the second electrode. The light emitted toward the first electrode is reflected from a reflection plane located at the first electrode to cause interference with the light emitted toward the second electrode. The interference provides an interference intensity distribution having a maximum peak at a wavelength λ₁. The light-emitting material of the light-emitting layer exhibits a photoluminescence spectrum having a maximum peak at a wavelength λ₂. The organic light-emitting element produces an electroluminescence spectrum having a maximum peak at a wavelength λ₃. These wavelengths satisfy the relationships: λ₂≠λ₃ and |λ₂−λ₃|<|λ₂−λ₁|.

The invention discloses an in-wafer reliability screening method for a GaN HEMT (High Electron Mobility Transistor) device. The in-wafer reliability screening method is characterized by comprising the following steps that: firstly, in-wafer electroluminescence spectrum testing platform is established, a GaN heterojunction HEMT device wafer is placed on a probe platform in a darkroom, and then probes are respectively pressed on a grid electrode, a source electrode and a leakage electrode; and then, the source electrode is grounded, certain forward bias is applied to the leakage electrode, backward bias Vgs, which changes from pinch-off voltage Vp to 0V, is applied to the grid electrode, a change relationship between the luminous intensity of a GaN heterojunction HEMT device and grid voltage is tested by virtue of a spectrum testing system, the luminescence spectrum of the device is tested under the adopted bias point Vgsm with the largest luminous intensity, and then the spectrum is analyzed to evaluate the reliability of the device. The in-wafer reliability screening method has the advantages that in-wafer screening can be realized; a series of reliability screening preparation procedures, such as scribing and packaging, is eliminated without long-time electric stress; and the reliability screening time is shortened, costs are saved, and work efficiency is improved.

The invention discloses a tetra-aryl pyrene derivative, a preparation method and application thereof and an electroluminescent device. The tetra-aryl pyrene derivative is a 1,3,5,9-tetra-aryl pyrene derivative and has a structural general formula shown in the specification, wherein Ar represents one of formulae shown in the specification. The tetra-aryl pyrene derivative has a non-planar butterfly-shaped rigid structure; through being connected with other groups of high fluorescence quantum efficiency, the rigidity of a whole compound molecule can be excellently improved, the vitrification transforming temperature of a compound is increased, the stability of light emitting devices is further improved, meanwhile, the accumulation of pi-pi among compound molecules is inhibited, the red shift degree of an electroluminescence spectrum is lowered, and the efficiency of fluorescence emitting devices is increased.

A chemical formula of a manganese-chromium-doped zinc tungstate luminescent material is ZnWO4:xMn4+, yCr3+ wherein 0.003<=x<=0.145, and 0.003<=y<=0.066. In an electroluminescence spectrum (EL) of a luminescent film made of the manganese-chromium-doped zinc tungstate luminescent material, strong luminescent peaks exist in wavelength areas of 607 nm and 629 nm, and good excitation of green light and blue light can be obtained. The invention further provides a preparation method of the manganese-chromium-doped zinc tungstate luminescent material, a manganese-chromium-doped zinc tungstate luminescent film, a preparation method of the manganese-chromium-doped zinc tungstate luminescent film and a film electroluminescence device.

The invention discloses a single-layer-structure inverted top-emission OLED (Organic Light Emitting Device), and belongs to the technical field of organic optoelectronic devices. The inverted top-emission OLED with the structure disclosed by the invention comprises a substrate, a cathode, a single-layer organic function layer and a transparent anode in sequence. The single-layer organic function layer is formed by doping two organic dyes into a single matrix material in a dopant mode, wherein the matrix material adopts an organic material with higher electron mobility, and the two organic dyes performs respective functions, namely, one organic dye is used for capturing holes, and the other organic dye is used for emitting light. According to the device with the structure disclosed by the invention, an exciton compound area is enlarged, the balance of electrons and holes in the single-layer organic function layer is favorably realized, and the device has the advantages of high efficiency, low efficiency roll-off, stability of light-emitting optical spectrum, and the like.

The invention belongs to the technical field of organic photoelectric materials, and discloses a planar heterojunction sensitized organic fluorescence light-emitting diode and a preparation method therefor. The diode comprises a substrate, a positive electrode, a P type organic semiconductor layer, an N type organic semiconductor layer and a negative electrode that are laminated in sequence; at least one layer of the P type organic semiconductor layer and the N type organic semiconductor layer is doped with a fluorescent material; the P type organic semiconductor layer is made from an organic conductor material capable of well conducting holes, and the N type organic semiconductor layer is made from an organic conductor material capable of well conducting electronics. The electroluminescence spectrum of the organic fluorescence light-emitting diode comes from the doped organic fluorescent material, so that the organic fluorescence light-emitting diode is lower in driving voltage and higher in luminous efficiency, the internal quantum efficiency can reach 100% theoretically, and the organic fluorescence light-emitting diode is wide in application prospects.

The invention relates to a marketable file and a method for identifying the same, and the marketable file and the method belong to the technical field of anti-counterfeiting of safe articles such as bank notes, certificates, magnetic cards, marketable bills, and the like. The invention discloses a marketable file which comprises a marketable file substrate and at least one electroluminescent substance for inspecting the marketable file, wherein the electroluminescent spectrums generated by the electroluminescent substance respectively under the excitations of electric fields of at least two types of characteristic frequencies have different spectral shapes, and the electroluminescent substance is combined with the marketable-file substrate in a code form. Based on the same principle, the invention also discloses a method for identifying the marketable file. Based on the particular relationship determination, the purpose of identifying the marketable files by using electroluminescence is achieved, so that the identification on the marketable files is simpler, more accurate and easier to realize.

The invention discloses a phenyl-imidazopyridine type trivalent-iridium organometallic complex and an organic electro-phosphorescent doped luminescent device based on the trivalent-iridium complex. The organic electro-phosphorescent material electroluminescent device has a layered doped structure, wherein a luminescent layer selects CBP as a matrix material and a series of Ir (III) complexes as dopant. The invention adopts a vacuum deposition process to prepare an electro-phosphorescent device with high performance, manufactures a PhOLED device with high efficiency and high brightness through the concentration of the Ir (III) complexes in a matrix, obtains green emission of which the electroluminescent spectrum peak value is between 511 and 540 nm through the structure modification of the Ir (III) complexes, improves the efficiency and brightness of the device, is flexible in manufacture process, and provides a good material for full-color display and illuminating application. And the material of the invention can be applied in single/full-color display and illuminating white-light devices.

The invention discloses a three-dimension structure-based fluorescence-phosphorescence hybridized organic electroluminescent white light polymer which is a polymer obtained by combining a spirobifluorene core group part, an Ir(piq)2acac red light group part and a 9,9-dioctylfluorene part which is connected between the spirobifluorene core group part and the Ir(piq)2acac red light group part, the fluorescence-phosphorescence hybridized organic electroluminescent white light polymer has the structural general formula as shown in the specification. The fluorescence-phosphorescence hybridized organic electroluminescent white light polymer is green solid powder, is freely soluble into common organic solvents, is excellent in thermal stability, an organic electroluminescent light-emitting device produced by the fluorescence-phosphorescence hybridized organic electroluminescent white light polymer used as a light-emitting layer material can be electroluminescent to emit white light, the electroluminescent light-emitting spectrum range is relatively wide, and the light-emitting efficiency of the device is high.

A manganese and titanium co-doped fluorine magnesium germanate luminescent material has a chemical formula of aMgO-bMgF2-cGeO2: dMn<4+>, eTi<4+>, wherein aMgO-bMgF2-cGeO2 is a matrix, manganese element and titanium element are activation elements, a is 1-6, b is 0.05-2, c is 0.5-3, d is 0.01-0.05, and e is 0.005-0.03. In an electroluminescence (EL) spectrum of a luminescent thin film prepared by the manganese and titanium co-doped fluorine magnesium germanate luminescent material, a wavelength region of 650 nm has very strong luminescence peaks, and the luminescent thin film can be used in a thin-film electroluminescent display. The invention also provides a preparation method and application of the manganese and titanium co-doped fluorine magnesium germanate luminescent material.

An organic light-emitting display (OLED) device is disclosed that includes: a red organic light-emitting diode comprising a red organic emission layer; a green organic light-emitting diode comprising a green organic emission layer; and a blue organic light-emitting diode comprising a blue organic emission layer. The difference between a peak of a photoluminescence spectrum of the red organic emission layer and a peak of an electroluminescence spectrum of the red organic light-emitting diode is less than 2 nm, the difference between a peak of a PL spectrum of the green organic emission layer and a peak of an EL spectrum of the green organic light-emitting diode is less than 2 nm, and the difference between a peak of a PL spectrum of the blue organic emission layer and a peak of an EL spectrum of the blue organic light-emitting diode is 4 nm or greater.

The invention discloses a samarium-doped rare earth borate luminous film which has a chemical formula of MeBO3:xSm<3+>, wherein x is more than or equal to 0.01 and less than or equal to 0.05, MeBO3 is a matrix, the samarium element is an active element, and Me is Y, La, Gd or Lu. The samarium-doped rare earth borate luminous film has high luminous peaks at the positions of 638nm and 727nm in an electroluminescent spectrum (EL) and can be applied to a thin-film electroluminescent display. The invention also provides a preparation method and application of the samarium-doped rare earth borate luminous film.

The invention provides a europium-doped gadolinium molybdate luminescent material. The chemical formula of the europium-doped gadolinium molybdate luminescent material is Gd2(MoO4)3:xEu3+, wherein x is more than or equal to 0.002 and less than or equal to 0.09. The electroluminescent spectrum (EL) of a luminescent film prepared by the europium-doped gadolinium molybdate luminescent material has a strong luminescent peak at the 613nm wavelength areas and the luminescent film can be applied in a film electroluminescent display. The invention also provides a preparation method of the europium-doped gadolinium molybdate luminescent material, a europium-doped gadolinium molybdate luminescent film, a preparation method thereof and a film electroluminescent device.

The invention discloses a double color core containing white light hyperbranched conjugated polymer prepared based on a red, green and blue tri-phosphor principle. Green and red phosphorescence Ir (III) complexes are taken as cores of a hyperbranched structure, and a polyfluorene derivative blue fluorescent material is taken as a skeleton of the hyperbranched structure, and through regulating the contents of the green and red phosphorescence Ir (III) complexes, a hyperbranched conjugated polymer which can achieve white light emission is obtained. The electroluminescent spectrum of the conjugated polymer disclosed by the invention has high color saturation, and is close to that of pure white light emission; and the conjugated polymer has good electroluminescent properties, and can be used as a light-emitting material for preparing white-light organic electroluminescent devices with single light-emitting layers.

A chemical formula of a europium-doped calcium silicate luminescent material is CaAl2Si2O8:xEu3+, wherein 0.0005<=x<=0.09. In an electroluminescence spectrum (EL) of an illuminant film made of the europium-doped calcium silicate luminescent material, strong luminescent peaks exist in wavelength areas of 590 nm and 620 nm, and good excitation of green light and blue light can be obtained. The invention further provides a preparation method of the europium-doped calcium silicate luminescent material, a europium-doped calcium silicate luminescent film, a preparation method of the europium-doped calcium silicate luminescent film and a film electroluminescence device.

The invention relates to a europium-terbium co-doped zirconium phosphate luminescent material. The europium-terbium co-doped zirconium phosphate luminescent material has a chemical formula of MZr4-x-yP6O24:xEu<3+>, yTb<3+>, wherein M is Ca, Ba or Sr, x is more than or equal to 0.02 and less than or equal to 0.1, and y is more than or equal to 0.01 and less than or equal to 0.04. The electroluminescent spectrum (EL) of a luminescent film prepared from the europium-terbium co-doped zirconium phosphate luminescent material has very strong photoluminescence peaks in areas of which the wavelengths are 510nm and 610nm, and the luminescent film can be applied to film electroluminescent displays. The invention also provides a preparation method and application of the europium-terbium co-doped zirconium phosphate luminescent material.