1763 results about "Electron injection layer" patented technology

An organic electroluminescent display element has at least a positive electrode, an organic luminescent film, an electron injection layer and a negative electrode. Each of the positive and negative electrodes is formed of a transparent conductive film, the electron injection layer is formed of a thin transparent film made of a halogenide of an alkali metal or an alkaline earth metal, or an organic metal complex containing an alkali metal or an alkaline earth metal as a metal, and the organic metal complex is at least one complex selected from the group consisting of acetylacetonate complexes, alpha-nitroso-beta-naphthol complexes, salicylaldoxime complexes, cupferron complexes, benzoinoxime complexes, bipyridine complexes, phenanthroline complexes, crown complexes, proline complexes and benzoylacetone complexes.

The present invention relates to a spiro-compound for an electroluminescence display device and an electroluminescence display device including the same. More particularly, the present invention relates to a spiro-compound comprising at least one selected from the group consisting of a compound represented as the following Formulae 1 and 2 and an electroluminescence display device including the same: In the above Formulae 1 and 2, the definition of the substituents is the same as in the specification. The spiro-compounds represented by the above Formulae 1 and 2 are applicable to any one of a hole injection layer (HIL), a hole transport layer (HTL), an electroluminescent layer, an electron transport layer (ETL), and an electron injection layer (EIL) of the electroluminescence display device. The spiro-compound can realize various colors with low energy, emit blue light even at a low voltage, and have an advantage of excellently increasing luminance and luminous efficiency.

An organic electroluminescence device comprising a cathode, an anode and at least one layer comprising a phosphorescent light emitting material and a host material which is sandwiched between the cathode and the anode and further comprising an electron injecting layer which is adhered to the light emitting layer and is capable of transporting electrons, wherein an ionization potential of the host material is 5.9 eV or smaller, and wherein an energy gap of the electron transporting material in the electron injecting layer is smaller than that of the host material in the light emitting layer or wherein a triplet energy of the electron transporting material in the electron injecting layer is smaller than that of the host material in the light emitting layer. It emits phosphorescent light with enhanced efficiency because it comprises a light emitting layer and an electron injecting layer both satisfying specified condition and employs a light emitting layer capable of electron transporting.

An OLED includes an anode, a light-emitting layer disposed over the anode, and a first electron-injecting layer disposed over the light-emitting layer, wherein the first electron-injecting layer includes at least one organic host material having a reduction potential less than −1.0 V vs. a Saturated Calomel Electrode and at least one dopant material capable of reducing the organic host material. The OLED also includes a second electron-injecting layer disposed in contact with the first electron-injecting layer, wherein the second electron-injecting layer includes at least one organic material having a reduction potential greater than −1.0 V vs. a Saturated Calomel Electrode, and a cathode disposed over the second electron-injecting layer.

An organic EL device has a hole injecting electrode (2), an electron injecting electrode (6), an organic layer participating in a light emitting function disposed between the electrodes. The organic layer includes a light emitting layer (4) comprising a conjugated polymer. The device further includes an inorganic insulative hole injecting layer (3) or an inorganic insulative electron injecting layer (5). The device can take advantage of both organic and inorganic materials, and has an improved efficiency, an extended effective life, and a low cost.

A hole injection layer, a hole transport layer, a blue light emitting layer, an orange light emitting layer, an electron transport layer, an electron injection layer, and a cathode are formed in this order on an anode. The blue light emitting layer is composed of a host material doped with an assisting dopant and a luminescent dopant emitting blue light. A material used for the hole transport layer is used for the assisting dopant. The orange light emitting layer is composed of a host material doped with a luminescent dopant emitting orange light.

A cathode adapted for use in an organic optoelectronic device is provided. The cathode has an electron injection layer, an organic buffer layer, a conducting layer, and a transparent conductive oxide layer disposed, in that order, over the organic operative layers of the optoelectronic device. A method of fabricating the cathode is also provided.

An organic electroluminescence device includes an anode, an emitting layer, a blocking layer, an electron injecting layer, and a cathode in sequential order. The emitting layer includes a host and dopant. The blocking layer includes an aromatic heterocyclic derivative. A triplet energy ETb (eV) of the blocking layer is larger than a triplet energy ETh (eV) of the host. An affinity Ab (eV) of the blocking layer and an affinity Ab (eV) of the electron injecting layer satisfy a relationship of Ae−Ab<0.2.

An OLED device includes an anode, a cathode, and at least one individually selected organic light-emitting layer disposed between the anode and cathode. The device also includes an electron-transporting layer disposed between the at least one light-emitting layer and the cathode, such electron-transporting layer including a first electron-transporting material, and an electron-injecting layer disposed between the electron-transporting layer and the cathode, such electron-injecting layer including a metal dopant having a work function less than 4.0 eV and an electron-transporting material that is different from the first electron-transporting material.

An organic electroluminescence device includes: an anode; a cathode opposed to the anode; and a plurality of emitting units including at least a first emitting unit and a second emitting unit. The plurality of emitting units each includes: an emitting layer; and an intermediate unit between the first emitting unit and the second emitting unit. The intermediate unit includes an electron injecting layer, a zinc oxide layer and a hole injecting layer in this sequence from the anode. The electron injecting layer contains an electron donating material and is adjacent to the first emitting unit. The hole injecting layer contains an organic electron accepting material and is adjacent to the second emitting unit.

An organic electroluminescence device containing an anode, an emitting layer, a blocking layer, an electron-injecting layer and a cathode in sequential order; wherein the emitting layer contains a host and a dopant which gives fluorescent emission of which the main peak wavelength is 550 nm or less; the affinity Ad of the dopant is smaller than the affinity Ah of the host; the triplet energy ETd of the dopant is larger than the triplet energy ETh of the host; the triplet energy ETb of the blocking layer is larger than ETh; the affinity Ab of the blocking layer and the affinity Ae of the electron-injecting layer satisfies Ae−Ab≦0.2 eV; and the electron mobility of the material constituting the blocking layer is 10−6 cm2 / Vs or more in an electric field intensity of 0.04 to 0.5 MV / cm.

A scanning line, signal line, first current supply line, and second current supply line are formed on a glass substrate. A first electrode is formed thereon; and, an organic layer, including a hole transport layer, light-emitting layer, electron transport layer, and electron injection layer is formed on the first electrode. A second electrode is formed as a cathode on the electron injection layer. The first electrode, serving as an anode, is connected to a plus terminal of a power source through driving devices and first current supply line, whereas the second electrode is connected to a minus terminal of the power source and is connected to the second current supply line in the display region of each pixel, with a contact hole serving as a feeding point, whereby the wiring resistance of the second electrode is reduced, and variations in the brightness of the panel is reduced.

The invention claims an organic electroluminescence device with stable luminescence, which comprises a substrate, a first electrode layer, a functional layer and a second electrode. The first electrode layer is arranged on the surface of the substrate; the functional layer is arranged on the first electrode layer and the second electrode is arranged above the functional layer, wherein the functional layer at least comprises an electron injection layer, an electronic transmission layer, a luminous layer, a hole transmission layer and a hole injection layer; the luminous layer is a compound doping luminous layer consisting of a double-layer doping luminous layer; the double-layer doping luminous layer respectively uses electronic transmission materials and hole transmission materials as a main material. By adopting the conventional phosphorescence dyes and fluorescent dyes with excellent performance as doping object materials in the luminous layer, through adjusting the thickness and the components of the luminous layer, the invention prepares the organic electroluminescence device with stable luminescence and high performance to meet the use requirement on information display and illumination.

The invention discloses a nitride luminescent device and a production method thereof, which relate to a semiconductor luminescent device and provide a nitride luminescent device with an asymmetric coupled multi-quantum well structure being the active area. The device at least comprises an n-type electron injection layer, a p-type hole injection layer and a multi-quantum well active layer which is sandwiched between the n-type electron injection layer and the p-type hole injection layer, and the active layer is composed of asymmetric coupled quantum well structures. The barrier layer of the quantum well is thinner, thus being easy to realize the tunneling of current carriers; transition energy between ground-state energy level in the quantum wells is gradually changed; the quantum wells with high transition energy are close to the p-type hole injection layer; and the quantum wells with low transition energy are close to the n-type electron injection layer. The active area structure can enhance the tunneling transportation of the holes in the quantum well active area, simultaneously block the tunneling transportation of electrons in the quantum well active area, improve the uneven distribution of current carriers in the active area of the nitride luminescent device, reduce electron leakage and energy band filling effect, and realize high-efficiency luminescence.

An object of the present invention is to provide an organic light-emitting display device using a number of organic light-emitting elements that emit lights of different colors, wherein the life of the organic light-emitting elements that emits light of a color having a short life can be prolonged. According to the present invention, a hole injection layer 7, an α-NPD vapor deposited film 8, an n doped electron transportation layer 11 and a p doped hole transportation layer 12, which are patterned to the same size as B sub-pixels, a DNA vapor deposited film 13, an electron injection layer 14 and an upper electrode 15 are formed on a lower electrode 5 in a B sub-pixel. The α-NPD vapor deposited film 8 and the DNA vapor deposited film 13 function as a blue light-emitting layer and exhibit the same properties as when a blue light-emitting element made up of a lower electrode 5, a hole injection layer 7, an α-NPD vapor deposited film 8 and an n doped electron transportation layer 11 and a blue light-emitting element made up of a p doped hole transportation layer 12, a DNA vapor deposited film 13, an electron injection layer 14 and an upper electrode 15 are connected in series. Therefore, it becomes possible to lower the value of a current required for certain brightness, and thus, the life can be prolonged.

The invention relates to a GaN-based light emitting diode and a preparation method thereof. An initial growth layer, a GaN buffer layer, an n-type electronic injection layer, a quantum well structure electronic emission layer, a quantum well structure light emitting active layer, a p-type AlInGaN electronic stopping layer and a p-type cavity injection layer are grown on an epitaxial substrate of the light emitting diode sequentially; in the quantum well structure of the electronic emission layer, the width of a forbidden band of the AlInGaN quantum well layer in the emission layer is greater than that of the forbidden band of the AlInGaN quantum well in the light emitting active layer; and the AlInGaN quantum well layer of the quantum well structure electronic emission layer is triangular. The GaN-based light emitting diode has the advantages that the quantum well structure electronic emission layer can improve the efficiency of an electronic injection light emitting active layer effectively; and by the triangular quantum well structure of the electronic emission layer, the polarization effect of the epitaxial substrate of the light emitting diode can be reduced, and the working voltage of the light emitting diode is decreased.

An electroluminescent device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL), the device further containing an electron transport layer (ETL) on the cathode side of the LEL and an organic electron injection layer (EIL) contiguous to the ETL on the cathode side, wherein the ETL contains a monoanthracene compound bearing aromatic groups in the 2-, 9-, and 10-positions.

The invention relates to a device structure of an organic light-emitting diode (OLED), and especially relates to a highly-efficient organic electroluminescent device based on a fluorescence doped luminescent layer. The organic electroluminescent device comprises a transparent substrate, a transparent anode, a cavity transmission layer, a first exciton barrier layer, a luminescent layer, a second exciton barrier layer, an electronic transmission layer, an electronic injecting layer and a metal cathode. The luminescent layer is formed by mixing a main body and a guest body. The main body material is organic small molecules whose energy difference between a first kind single heavy excitation state and a triplet excitation state is quite small. The guest body material is dye molecules with high fluorescence efficiency, like quinacridone derivatives. The highly-efficient organic electroluminescent device based on a fluorescence doped luminescent layer is advantageous in that the external quantum efficiency exceeds 5% of theoretic limit efficiency of a conventional fluorescence device, and the luminescence efficiency of a fluorescent OLED device can be effectively improved; the luminescent device of the invention is high in brightness, low in starting voltage, high in efficiency, and low in efficiency roll-off.

A white organic light emitting device includes: first and second electrodes formed to face each other on a substrate; a first stack configured with a hole injection layer, a first hole transportation layer, a first light emission layer and a first electron transportation layer which are stacked between the first and second electrodes; a second stack configured with a second hole transportation layer, a second light emission layer, a third light emission layer, a second electron transportation layer and an electron injection layer which are stacked between the first stack and the second electrode; and a charge generation layer interposed between the first and second stacks and configured to adjust a charge balance between the two stacks.

The concentration of oxygen, which causes problems such as decreases in brightness and dark spots through degradation of electrode materials, is lowered in an organic light emitting element having a layer made from an organic compound between a cathode and an anode, and in a light emitting device structured using the organic light emitting element. The average concentration of impurities contained in a layer made from an organic compound used in order to form an organic light emitting element having layers such as a hole injecting layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer, is reduced to 5×1019 / cm2 or less, preferably equal to or less than 1×1019 / cm2, by removing the impurities with the present invention. Formation apparatuses are structured as stated in the specification in order to reduce the impurities in the organic compounds forming the organic light emitting elements.

A tandem OLED includes an anode, a cathode, and at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-injecting layer, one hole-transporting layer, one organic light-emitting layer, one electron-transporting layer, and one electron-injecting layer. The OLED also includes at least one intermediate connector, wherein each of the intermediate connectors includes at least one layer, and wherein each of the intermediate connectors is disposed between electroluminescent units, wherein the thickness of each layer in each of the electroluminescent units and the intermediate connectors is selected to satisfy the test condition that the voltage drop from the anode to the cathode is less than 4.0 V×N (the number of electroluminescent units) at 20 mA / cm2.

The object of the invention is to provide an organic EL device which possesses the merits of both an organic material and an inorganic material, has an extended life, an improved efficiency, a low driving voltage and high luminance, and is fabricated at low cost. This object is achieved by the provision of an organic EL device comprising a substrate, a hole injecting electrode and a cathode formed on the substrate, and at least one organic layer located between these electrodes. An inorganic insulating electron injecting layer is located between the cathode and the organic layer. The inorganic insulating electron injecting layer comprises as an oxide having a low work function at least one oxide having a work function of lower than 2.5 eV, and as an oxide having a high work function at one oxide having a work function of 2.5 to 4 eV.

The invention provides an application of crosslinkable conjugated polymer materials in a flip organic photoelectric device. The conjugated polymer materials possess a conjugated main chain and functionalized side chain groups, wherein the functionalized side chain groups comprise a crosslinkable substituent group and a strong polar group possessing water alcohol solubility. Under the condition ofillumination or heating, the conjugated polymer materials can be processed to be insoluble and nonfusible interpenetrating polymer networks through using a strong polar solvent. When constructing a multilayer device, an interface miscibility phenomenon between layers can be overcome. The interpenetrating polymer networks can be regarded as materials of an electron injecting layer or an electron transmission layer to prepare a flip organic electroluminescent device or a flip organic solar cell device. The electron can be directly injected or extracted from a high work function transparency electrode. By using the crosslinkable conjugated polymer materials, processes of the flip organic electroluminescent device and the flip organic solar cell device can be simplified, and an object of preparing the efficient organic photoelectric device by using a low cost technology can be realized.

An organic light-emitting device and an organic light-emitting display apparatus including the same are provided. The organic light-emitting device comprises pixels, each pixel comprising three sub-pixels, each sub-pixel comprising a layered structure, the individual layers comprising organic compounds. The layered structure can comprise organic light emission layers, resonance auxiliary layers that provide a thickness allowing the establishment of microcavity effects that increase luminance, and layers that facilitate electron transfer between the electrodes and the organic emission layers, such as doping auxiliary layers, hole injection layers, hole transport layers, electron injection layers and electron transport layers.

In the present invention, an electron injection composition for a light-emitting element, comprising a pyridine derivative represented by general formula 1 and at least one of an alkali metal, an alkali earth metal, and a transition metal, is used to form an electron injection layer in a portion of a layer including luminescent material in a light-emitting element, and it is also an object of the present invention to provide, by using the composition, a light-emitting element that has more superior characteristics and a longer lifetime as compared to conventional ones. (where each of R1 to R8 represents hydrogen, halogen, a cyano group, an alkyl group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group.)

The application discloses an OLED (organic light-emitting diode) display device and a manufacture method thereof; the OLED display device comprises a substrate, an anode layer, a pixel definition layer, a hole injection layer, a hole transport layer, a light-emitting layer, an electronic transport layer, an electronic injection layer, spacer pillars, passivating pillars positioned on the spacer pillars, and a cathode layer, wherein conductive pillars are electrically connected to the cathode layer. By electrically connecting the conductive pillars to the cathode layer, it is equivalent that a conductive resistor is connected parallelly to the cathode layer, resistance of the cathode layer is decreased, voltage drop of the cathode layer is decreased accordingly, and the OLED display device can provide more uniform displaying at the premise of not increasing the thickness of the cathode layer or decreasing the light transmittance of the cathode layer. With the presence of the passivating pillars, lateral leaking current between adjacent light-emitting pixels is decreased, the problem of brightness possessing by pixels is avoided, color mixing rate is deceased, and product yield is increased.

Provided are an electron injecting layer formed by spin-coating a solution of a superacid salt, a lithium salt or a mixture thereof dissolved in a solvent, a photovoltaic device including the same, a method of manufacturing the photovoltaic device, and an organic light-emitting device including the electron injecting layer.

A highly transparent non-metallic cathode is disclosed that comprises a metal-doped organic electron injection layer that is in direct contact with a transparent non-metallic electron injecting cathode layer, such as indium tin oxide (ITO), wherein the metal-doped organic electron injection layer also functions as an exciton blocking or hole blocking layer. The metal-doped organic electron injection layer is created by diffusing an ultra-thin layer of about 5-10 Å of a highly electropositive metal such as Li throughout the layer. A representative embodiment of the highly transparent non-metallic cathode comprises a layer of ITO, a layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), which acts as an electron injection, exciton blocking, and hole blocking layer, and an ultra-thin layer of lithium, which degenerately dopes the layer of BCP, improving the electron injecting properties of the BCP layer. This cathode is demonstrated for use in an OLED having a transparency of about 90% or higher combined with a device external quantum efficiency of about 1% or higher.