93results about How to "Improve electron injection performance" patented technology

An organic electroluminescence device including opposite anode and cathode, and a hole-transporting region, an emitting layer and an electron-transporting region in sequential order from the anode between the anode and the cathode, wherein the emitting layer is formed of a red emitting layer, a green emitting layer, and blue emitting layer; the blue emitting layer contains a host BH and a fluorescent dopant FBD; the triplet energy E^T_fbd of the fluorescent dopant FBD is larger than the triplet energy E^T_bh of the host BH; the green emitting layer contains a host GH and a phosphorescent dopant PGD; a common electron-transporting layer is provided adjacent to the red emitting layer, the green emitting layer and the blue emitting layer within the electron-transporting region; the triplet energy E^T_el of a material constituting the electron-transporting layer is larger than E^T_bh; and the difference between the affinity of the host GH and the affinity of the material constituting the electron-transporting layer is 0.4 eV or less.

The object of the invention is to provide an organic electroluminescent element which reduces the luminescence starting voltage, increases the luminescence brightness, and has excellent stability with repeated use. The invention achieves these objects by providing an organic electroluminescent element comprising at least a positive electrode, luminescing layer, and negative electrode, wherein said negative electrode is a compound layer of magnesium and a metal having a higher work function than magnesium, and the exterior surface side of said compound layer has a higher percentage of metal having a high work function.

The invention discloses an OLED light emitting device, a display panel and a display apparatus, and aims to lower the working voltage of the OLED light emitting device and improve the efficiency of the OLED light emitting device. The OLED light emitting device comprises a first electrode, a first light emitting layer, a first charge generation layer, a second light emitting layer, a second chargegeneration layer, a third light emitting layer and a second electrode which are arranged on a transparent substrate in sequence; each of the first charge generation layer and the second charge generation layer comprises an n-doped semiconductor film layer and a p-doped semiconductor film layer separately, wherein a Yb metal element is doped in the n-doped semiconductor film layers of the first charge generation layer and the second charge generation layer separately; the Yb metal element in the first charge generation layer accounts for A% based on volume percentage; the Yb metal element in the second charge generation layer accounts for B% based on volume percentage; and A is greater than B, wherein A and B are both positive numbers.

The invention relates to an inverted organic electroluminescent device. The inverted organic electroluminescent device comprises a substrate, a cathode layer, an electron injecting layer, an organic function layer and an anode layer which are superposed in sequence. The organic function layer comprises an electron transmission layer, a luminescent layer, a cavity transmission layer and a cavity injecting layer which are superposed in sequence. The optical refractive index of the electron injecting layer is between those of the cathode layer and the electron injecting layer. The inverted organic electroluminescent device has the advantages that the electron injecting capability is good, the optical effect is good, a relatively small current is needed to achieve the same brightness, and the work voltage of the device is substantially lowered, so that the service lifetime of the device is greatly prolonged, the cost is saved, and the commercialization of the device is facilitated.

The present invention provides an organic EL display device that has high out-coupling efficiency of light. The organic EL display device includes a semi-transparent cathode having high light reflectivity, high light transparency, low light absorptivity, and good electron injection properties. The organic EL display device of the present invention includes an organic EL element that includes an anode, an organic layer, an electron injection layer, and a cathode stacked in this order toward a viewing side, wherein the cathode is a thin film made of silver or a silver alloy, the electron injection layer includes a first electron injection layer arranged on the organic layer side and a second electron injection layer arranged on the cathode side, the first electron injection layer is formed as a thin film containing lithium fluoride, the second electron injection layer is formed as a thin film containing a magnesium-silver alloy that has a silver concentration of more than 70 wt % and less than 100 wt %, and an average total film thickness of the cathode and the electron injection layer is not less than 15 nm and not more than 25 nm.

An organic light-emitting device that achieves highly efficient emission and low-voltage operation is provided. The organic light-emitting device contains a 9H-xanthen-9-one derivative.

The invention relates to an organic electroluminescence device, comprising an anode layer, an organic functional layer and a cathode layer in order, which is characterized in that a cathode decorative layer made of the alkali metal salt of nitrogenous fragrant phenol is also included between said organic functional layer and the cathode layer, wherein, the alkali metal salt is preferredly a metal cesium salt. The invention has gotten higher device performance when it is used in conjunction with the high work function metallic cathode, through the development of the cathode interface decorative material of membrane that has a high rejection membrane electron injection ability.

The invention discloses a composite multifunctional OLED electrode and a preparation method thereof. The composite multifunctional OLED electrode comprises a flexible substrate and a metal nanometer wire-photoelectric polymer mixing layer growing on the flexible substrate, wherein the metal nanometer wire-photoelectric polymer mixing layer comprises metal nanometer wires and photoelectric polymermaterial, a layer of photoelectric polymer material is spin-coated on the metal nanometer wires, so that the photoelectric polymer material is filled into gaps among the metal nanometer wires. According to the composite multifunctional OLED electrode and the preparation method thereof provided by the invention, the metal nanometer wires are embedded into the soft and thick photoelectric polymer material to form the composite multifunctional OLED electrode with good transparent conductive property and cavity/electron injection capacity, the problem that the nanometer wire prepared by the traditional method is difficult to synchronous achieve good light transparency and conductivity is solved, and the non-vacuum preparation method is used, so that the manufacturing cost of the current OLED electrode can be greatly reduced.

The invention provides an organic light-emitting device and a preparation method thereof. According to the organic light-emitting device, a first metal layer, a silicon compound doping layer, and a second metal layer are successively laminated to form a cathode. Therefore, the electron injection capability and stability of the device are improved and the light can reach the conductive anode glass substrate effectively, thereby improving the luminous efficiency of the device. The preparation method is simple and is easy to control and operation; and the raw material is easy to access.

The invention discloses a hyperbranched electroluminescent polymer as well as a polymerization monomer, a preparation method and application thereof, and belongs to the technical field of organic photoelectricity. The structure of the electroluminescent polymer is shown as a formula (II), and a sulfuryl-containing three-dimensional asymmetric polycyclic aromatic structure can improve the thermal stability, the fluorescence quantum yield and the carrier transport capability of a luminescent material, so that a luminescent device can obtain efficient and stable luminescent device performance; and the polymer has large steric hindrance, and is a potential dark blue light emitting polymer. The electroluminescent polymer provided by the invention has good solubility, can be dissolved by adopting a common organic solvent, and can be prepared into a light-emitting layer of a light-emitting diode through spin coating, ink-jet printing or printing film formation.

An organic EL element including an anode; a light-emitting layer above the anode; a first interlayer on the light-emitting layer, the first interlayer including a fluoride of a first metal that is an alkali metal or alkaline earth metal; a second interlayer on the first interlayer, the second interlayer including a second metal that has a property of cleaving a bond between the first metal and fluorine in the fluoride; a cathode on the second interlayer; and a sorption layer above the cathode, the sorption layer including a third metal that has a property of taking up and holding at least one of moisture and oxygen. A thickness D1 of the first interlayer and a thickness D2 of the second interlayer satisfy 5%≦D2/D1≦25%.

According to the present invention, there are provided pyrimidine derivatives represented by the following general formula (1). The pyrimidine derivatives of the invention are novel compounds and feature (1) good electron injection property, (2) high electron mobility, (3) excellent hole blocking property, (4) good stability in their form of thin films, and (5) excellent heat resistance.

The invention discloses an inverted organic light emission diode and a preparation method and application thereof. The inverted organic light emission diode comprises a substrate, a cathode layer, an organic function layer and an anode layer which are in stack combination sequentially. From the cathode layer to the anode layer, the organic function layer comprises an electron injection layer, an electron transfer layer, a light-emitting layer and a hole transfer layer which are in stack combination sequentially, wherein the electron injection layer is made of lanthanum hexaboride. The inverted organic light emission diode is small in drive current, long in service life, high in light-emitting efficiency, and wide in application range; and with the preparation method, requirements for the equipment is low, and preparation process condition is easy to control.

The invention relates to a compound, application thereof and an organic electroluminescence device. The compound has a structure shown as a formula (1). The compound is used as an electron transport material in an organic electroluminescent device; the organic electroluminescent device includes a substrate, a first electrode, a second electrode, and at least one organic layer interposed between the first electrode and the second electrode, the organic layer containing any one or a combination of at least two of the compounds. The compound provided by the invention has relatively high electroninjection capability and electron migration capability, and when the compound is used for an organic electroluminescence device, the device can have relatively high light-emitting efficiency, relatively low starting voltage, relatively long service lifetime and high device stability.

An object of the present invention is to provide, as a material for a highly efficient and highly durable organic EL element, an organic compound having excellent properties, including excellent electron-injecting/transporting capability, hole-blocking capability, and high stability in the form of a thin film. Another object of the present invention is to provide a highly efficient and highly durable organic EL element by using this compound. The present invention provides a compound having a pyrimidine ring structure that is designed and chemically synthesized with the focus on the properties of the pyrimidine ring, which has affinity for electrons, specifically with the focus on the capability of the nitrogen atoms to coordinate to a metal and excellent heat resistance. Various organic EL elements including the compound were experimentally produced, followed by evaluation of the characteristics of those elements. From the results, it was found that the organic EL elements have favorable characteristics.

Provided is a top-emission type electroluminescent element in which a total optical transparency of films of the upper part of a light-emitting layer including a transparent conductive film is made to be improved, and in which effective light-emitting intensity can be obtained by improving electron injection efficiency. This organic EL (electroluminescent) element is the top-emission type electroluminescent element, and has a substrate (1), an electrode (2) installed on a surface of the substrate (1), a positive hole injection layer (3) installed on a surface of the electrode (2), a light-emitting layer (4) installed on a surface of the positive hole injection layer (3), a reduction-reacting part (5) installed at the light emitting layer (4), and formed by reduction reaction of an alkaline metal or a metal compound of an alkaline earth metal and a reducer, and a transparent conductive film (8) installed on the reduction-reacting part (5). The reduction-reacting part (5) has a function to demonstrate improvement of the electron injection characteristic to the light emitting layer (4).

The invention provides a transparent organic electroluminescent device comprising a glass substrate, and a transparent anode, a hole injection layer, a hole transmission layer, a green luminescent layer, an electron transmission layer, an electron injection layer and a transparent cathode which are arranged on the glass substrate in a laminating way in turn. The transparent anode comprises a hydroxy germane organic matter layer and a metal layer. Material of the hydroxyl germane organic matter layer is at least one type of (3-hydroxy propyl) trimethoxy germane, (3-hydroxy ethyl) trimethoxy germane, (3-hydroxy methyl) trimethoxy germane and O, O, O-trimethyl-hydroxy germane. Material of the metal layer is at least one type of a magnesium silver alloy, a lithium aluminum alloy, barium and calcium. According to the transparent organic electroluminescent device, light emergent efficiency of the anode surface is over 45% than light emergent efficiency of the cathode surface so that luminescent performance is excellent. The invention also provides a preparation method of the transparent organic electroluminescent device.

The invention relates to an organic electroluminescence device which comprises a substrate, a positive pole, an organic luminescent functional layer, an electronic injection layer and a negative pole, wherein the substrate, the positive pole, the organic luminescent functional layer, the electronic injection layer and the negative pole are sequentially arranged in an overlaid mode. The electronic injection layer is made of a mixture composed of barium compounds and metal. The barium compounds are selected from one of barium hydroxide, barium carbonate, barium nitrate and barium sulfate, and the metal is selected from one of silver, aluminum, samarium, ytterbium and alloy of the silver, the aluminum, the samarium and the ytterbium. In the mixture, the mass percent of the barium compounds is 35-80%. The mixture composed of the barium compounds and the metal has the excellent electronic injection performance, the electronic mobility can be improved, the starting voltage of the organic electroluminescence device can be reduced, the quenching harmful effect of halogen atoms on emitted light can be avoided, and the luminous efficiency is high. The invention further provides a manufacturing method of the organic electroluminescence device, another organic electroluminescence device and the manufacturing method of the organic electroluminescence device.

The invention discloses a compound, an application thereof and an organic electroluminescence diode device containing the same. The compound has a structure of a formula (I) and is used as an electrontransmission material in the organic electroluminescence device; the organic electroluminescence device comprises a substrate, a first electrode, a second electrode and at least one organic layer inserted between the first electrode and the second electrode, wherein the organic layer contains any one or a combination of at least two of the compounds. The compound has higher electron injection capability and electron migration capability, and when the compound is applied to the organic electroluminescence device, the device can have higher luminous efficiency, lower starting voltage, longer service life and high stability.