1194 results about "Color purity" patented technology

As a novel substance having a novel skeleton, an organometallic complex having high emission efficiency and improved color purity is provided. The color purity is improved by reducing the half width of an emission spectrum. The organometallic complex is represented by General Formula (G1). In General Formula (G1), at least one of R1 to R4 represents a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and the others each independently represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms. Note that the case where all of R1 to R4 represent alkyl groups each having 1 carbon atom is excluded. Further, R5 to R9 each independently represent hydrogen or a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.

As a novel substance having a novel skeleton, an organometallic complex with high emission efficiency which achieves improved color purity by a reduction of half width of an emission spectrum is provided. One embodiment of the present invention is an organometallic complex in which a β-diketone and a six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom are ligands. In General Formula (G1), X represents a substituted or unsubstituted six-membered heteroaromatic ring including two or more nitrogen atoms inclusive of a nitrogen atom that is a coordinating atom. Further, R1 to R4 each represent a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms.

Provided are an organic light emitting device including: a substrate; a first electrode; a second electrode; and an organic layer interposed between the first electrode and the second electrode and including an emission layer, wherein one of the first electrode and the second electrode is a reflective electrode and the other is a semitransparent or transparent electrode, and wherein the organic layer includes a layer having at least one of the compounds having at least one carbazole group, and a flat panel display device including the organic light emitting device. The organic light emitting device has low driving voltage, excellent current density, high brightness, excellent color purity, high efficiency, and long lifetime.

The invention relates to a perovskite / polymer composite luminescent material and a preparation method thereof, which belong to the technical field of composite materials and luminescent materials, wherein the structural formula of the perovskite is R1NH3AB3 or (R2NH3)2AB4, A and B form a ligand octahedral structure, R1NH3 or R2NH3 are filled into gaps of the ligand octahedral structure which is formed through the A and the B, R1 is methyl, R2 is a long-chain organic molecular group, the A is any one of metal Ge, Sn, Pb, Cu, Mn, Sb and Bi, the B is any one of Cl, Br and I. The perovskite / polymer composite luminescent material which is made through the preparation method is high in luminescent intensity, high in luminescent color purity, excellent in light and thermal stability and excellent chemical resistant property and mechanical property, and lays the foundation for theory research and application of the perovskite / polymer composite luminescent material in high-performance photoluminescence devices, flexible display, lasers, nonlinear optical devices. The preparation method can obtain composite materials which can cover a whole visible region through luminescent wavelengths, and has wide application prospect in the fields of wide gamut light emitting diode (LED) and high performance displays and the like.

A light excitation diffusion sheet for a backlight unit adapted to absorb a portion of light emitted from a light source of a blue wavelength or a mixed wavelength of a blue wavelength and at least one other wavelength, to emit light at different wavelengths from the light emitted from the light source, and to allow the rest of the light emitted from the light source to penetrate the sheet The light excitation-diffusion sheet comprises a light-exciting material exciting and amplifying the light from the light source and a light-diffusing material scattering and diffusing the light from the light source. The light-exciting material and the light-diffusing material are uniformly distributed in the light excitation-diffusion sheet The use of the light excitation-diffusion sheet enables production of edge light type and direct light type backlight units having diffusion and prism functions, good color purity and improved light efficiency at reduced costs.

Disclosed are a white light-emitting diode (LED) in which an emission layer comprising a red luminous body and a green luminous body is formed on a blue LED, and a preparation method thereof. The emission layer comprises both of at least one inorganic phosphor and at least one semiconductor nanocrystal. The white LED prepared according to the present invention has excellent color purity, high luminous efficiency and improved light stability so that it can be advantageously used as a light source for various display devices.

Provided is a colored photosensitive curing composition useful for color filters in primary colors, including blue, green, and red, having a high molar absorption coefficient and allowing a reduction in film thickness and superior color purity and fastness. A colored photosensitive curing composition, comprising, as its colorant, a dipyrromethene-based metal complex compound obtained from a metal or metal compound and a dipyrromethene-based compound represented by the following Formula (I): wherein in Formula (I), R1 to R6 each independently represent a hydrogen atom or a substituent group; and R7 represents a hydrogen or halogen atom, or an alkyl, aryl or heterocyclic group.

The present invention provides an organic electroluminescent element which is superior in luminance, reliability, and thermal stability and is capable of selectively emitting light with comparative long wavelengths such as red and good color purity and a light-emitting device or display device incorporated therewith. The organic electroluminescent element consists of a glass substrate (1), an anode (2), a hole transporting layer (10), an emitting layer (11), an electron transporting layer (12), and a cathode (3), which are sequentially laminated on top of the other. The emitting layer (11) is formed from a mixture composed of at least one species of the styryl compound represented by the general formula [I] below and a material with charge transporting capability. Y—CH═CH—X   General formula [I](where X denotes an aryl group (such as phenyl group) which has a substituent group (such as cyano group and methyl group), and Y denotes a group having a skeleton of aminophenyl group or the like.)

A hybrid type display apparatus capable of maintaining color purity in a case of transmission mode display, and improving lightness of color in a case of reflection mode display is provided. This hybrid type display apparatus is comprised of: a pair of substrates comprising a first substrate on a front side and a second substrate on a rear side, disposed in opposite directions spaced apart from each other; a first electrode provided on an internal surface of the first substrate; a second electrode provided on an internal surface of the second substrate; a color filter provided on the first substrate, aligned with a pixel in a portion between the first electrode and the second electrode spaced apart in the opposite directions from each other; a liquid crystal layer interposed between the first and the second substrates; and a reflection layer provided on the second substrate. The reflection layer has a hole provided for each pixel, which divides a plane of each pixel into a transmission portion within the hole and a reflection portion outside the hole. The color filter comprises a lamination of a colored layer and a transparent layer. The colored layer is formed thinner in the reflection portion than in the transmission layer, and the transparent layer is formed to cover a difference in level between the transmission portion and the reflection portion.

A blue light emitting compound and an organic electroluminescent device using the compound are provided. The device exhibits improved color purity of blue emission and excellent life characteristics so as to be used to manufacture a full-color display.

It is an object to provide a thin-type full-color display device with the long lifetime, inexpensively, in which desired emission luminance and desired color purity can be obtained at a low voltage. In a light-emitting device capable of full-color display, among a plurality of light-emitting elements emitting different emission colors (for example, colors of red (R), green (G), and blue (B)), at least one of the light-emitting elements of an emission color is a light-emitting element including an organic compound (an organic EL element), and the other light-emitting element of an emission color is a light-emitting element using an inorganic material as a light-emitting layer or a fluorescent layer (an inorganic EL element). It is to be noted that the organic EL element and the inorganic EL element are formed over the same substrate.

Color purity of a light emitting element is improved without an adverse effect such as reduction in voltage and luminance efficiency. The light emitting element has a light emitting laminated body including a light emitting layer between a pair of electrodes. A buffer layer is provided to be in contact with at least one of the electrodes. One of the electrodes is an electrode having high reflectance and the other is a translucent electrode. By employing a translucent electrode, light can be transmitted and reflected. An optical distance between the electrodes is adjusted in accordance with a thickness of the buffer layer, and accordingly, light can be resonated between the electrodes. The buffer layer is made of a composite material including an organic compound and a metal compound; therefore, voltage and luminance efficiency of the light emitting element is not affected even if a distance between the electrodes becomes long.

The invention provides a transflective liquid crystal display device which can achieve substantially the same color purity regardless of the selected mode (transmissive or reflective) by controlling the density of a uniformly thick color filter layer or the thickness of a uniformly dense color filter layer, or by having another color filter layer that affects light only in the transmissive mode. The invention emphasizes the thickness of the color filter through which light passes or the density of the color filter through which light passes, in order to achieve substantially uniform color purity.

The radius of curvature of the outer surface of a panel is 10,000 mm or more, and a shadow mask is made of a material containing 95% or more of iron. A sagging amount change curve along a curve C1 on the surface of the shadow mask, which a plane passing through a center P0 of a useful area of the shadow mask and parallel to a tube axis and a major axis crosses, satisfies a particular Condition 1. Assuming that an intersection between the curve C1 and a useful area end of the shadow mask is a major axis end PL, a distance from the center P0 to the major axis end PL along a major axis is W, and a point on the curve C1 away from the center P0 by ⅔×W in the major axis direction is P1, a sagging amount change curve along a curve C2 on the surface of the shadow mask, which a plane passing through the point P1 and parallel to the tube axis and the minor axis crosses, satisfies a particular Condition 2. Consequently, a color picture tube can be realized, which has satisfactory visibility, and less degradation in color purity caused by doming while having a shadow mask made of an inexpensive material with satisfactory moldability.

The invention provides a projection system, a light source system and a light source component. The light source system comprises an exciting light source, a wavelength conversion device, a filter device, a driving device and a first optical component, wherein the wavelength conversion device comprises at least one wavelength conversion region. The filter device is fixed relative to the wavelength conversion device and comprises at least one first filter region. The driving device is used for driving the wavelength conversion device and the filter device, so that the wavelength conversion region and the first filter region synchronously move; and the wavelength conversion region is periodically arranged on a propagation path of exciting light, so that the exciting light wavelength is converted into excited light. The first optical component guides the exciting light into the first filter region. The first filter region is used for filtering the excited light to improve the color purity of the excited light. Through the mode, the filter device is fixed relative to the wavelength conversion device and is driven by the same driving device; and the light source system has the advantages of simple structure, easiness for implementation, high synchronism and the like.

The invention discloses a quantum-dot light-emitting diode displayer and a display device. Electroluminescence structures are arranged in subpixel units of pixel units; a monochromatic quantum dot layer is arranged in the subpixel unit of at least one color of each pixel unit and positioned on light emerging sides of the electroluminescence structures; the monochromatic quantum dot layers emit monochromatic light corresponding to the colors of the subpixel units after excited by light emitted by the electroluminescence structures. Quantum dots are adopted to replace the existing inorganic doping system as a photochromic conversion material; the quantum dots can emit the monochromatic light after excited by the light emitted by the electroluminescence structures; since the quantum dots are narrow in emission spectrum and high in luminous efficiency, the color purity of the subpixel units forming the pixel units can be improved, and the display quality of the displayer is improved. In addition, since the quantum dots can scatter the light emitted by the electroluminescence structure, the light transmittance of photochromic conversion can be improved in comparison with the inorganic doping system material, and the luminous efficiency of the displayer is improved.

A hybrid type display apparatus capable of maintaining color purity in a case of transmission mode display, and improving lightness of color in a case of reflection mode display is provided. This hybrid type display apparatus is comprised of: a pair of substrates comprising a first substrate on a front side and a second substrate on a rear side, disposed in opposite directions spaced apart from each other; a first electrode provided on an internal surface of the first substrate; a second electrode provided on an internal surface of the second substrate; a color filter provided on the first substrate, aligned with a pixel in a portion between the first electrode and the second electrode spaced apart in the opposite directions from each other; a liquid crystal layer interposed between the first and the second substrates; and a reflection layer provided on the second substrate. The reflection layer has a hole provided for each pixel, which divides a plane of each pixel into a transmission portion within the hole and a reflection portion outside the hole. The color filter comprises a lamination of a colored layer and a transparent layer. The colored layer is formed thinner in the reflection portion than in the transmission layer, and the transparent layer is formed to cover a difference in level between the transmission portion and the reflection portion.

To provide a phosphor emitting green fluorescence and having such superior characteristics as excellent conversion efficiency of blue light or near-ultraviolet light and excellent color purity,a phosphor satisfying the following conditions (i) to (v):(i) the wavelength of emission peak thereof is 510 nm or longer and 542 nm or shorter, when excited with light of 400 nm or 455 nm(ii) the full width at half maximum of emission peak thereof is 75 nm or narrower, when excited with light of 400 nm or 455 nm,(iii) the external quantum efficiency, which is defined by the formula below, is 0.42 or larger, when excited with light of 400 nm or 455 nm,(external quantum efficiency)=(internal quantum efficiency)×(absorption efficiency)(iv) a part of its surface comprises substance containing oxygen, and(v) it contains a bivalent and trivalent metal element (MII element), and its molar ratio to the total bivalent elements is larger than 1% and smaller than 15%.

An organic electroluminescence device in which the following total optical thickness is set at a value which enhances the intensity of the central wave length lambda ( lambda being selected in the ranges of 440 to 490 nm, 500 to 550 nm, and 600 to 650 nm) of the electroluminescence light emitted from the organic multi-layer part having a refractive index of 1.6 to 1.8: (1) in the construction of a substrate / a transparent electrode of a high refractivity / an organic multi-layer part / a cathode, the total optical thickness of the transparent electrode of a high refractivity and the organic multi-layer part; (2) in the construction of a substrate / an underlayer of a high refractivity / a transparent electrode / an organic multi-layer part / a cathode, the total optical thickness of the underlayer of a high refractivity, the transparent electrode, and the organic multi-layer part or the total optical thickness of the transparent electrode and the organic multi-layer part; and (3) in the construction of a substrate / a underlayer of a low refractivity / a transparent electrode / an organic multi-layer part / a cathode, the total optical thickness of the transparent electrode and the organic multi-layer part. The device has a simple construction and the color purity of the blue light emission is particularly increased.

A blue-emitting phosphor is optimized by controlling mole fractions typically of Mg and Si in Sr3-eMgbSi2cO8d:Eue or by further including an optimal amount of at least one additional component such as Ba or Ca. The resulting phosphor exhibits a higher brightness and a higher color purity upon excitation by ultraviolet light emitted as a result of discharge of xenon gas. The optimized phosphor is incorporated into light emitting devices such as lamps and PDPs, and further into display devices.

It is an object of the present invention to provide a novel material capable of realizing excellent color purity of blue, and a light emitting element and a light emitting device using the novel material. Further, it is an object of the present invention to provide which is highly reliable, and a light emitting element and a light emitting device using the novel material. The structure for solving the above problems in accordance with the present invention is an anthracene derivative simultaneously having a diphenylanthracene structure and a carbazole skeleton in a molecule as represented by structural formula (1):

Provided are a cyclopentaphenanthrene-based compound and an organoelectroluminescent device employing the same. The cyclopentaphenanthrene-based compound is easy to prepare and excellent in solubility, color purity, color stability, and thermal stability. The cyclopentaphenanthrene-based compound is useful as a material for forming an organic layer, in particular, an emitting layer, in an organoelectroluminescent device, and as an organic dye or an electronic material such as a nonlinear optical material.

It is an object of the present invention to provide a substance that can emit phosphorescence. Further, it is an object of the present invention to provide a light emitting element with favorable color purity. The present invention provides an organometallic complex having a structure represented by a general formula (1). A light emitting element that can exhibit red or reddish emission of light with favorable color purity can be obtained by using the organometallic complex of the present invention as aluminescent substance. In addition, a light emitting element that can emit light efficiently can be obtained by using the organometallic complex of the present invention as a sensitizer.

Provided are an organic light-emitting compound of Formula 1 and an organic light-emitting device using the organic light-emitting compound: where Ar, R1, R2, R3, R4, and R5 are the same as defined in the detailed description. The organic light-emitting device manufactured using the organic light-emitting compound has a low turn-on voltage and high efficiency and color purity.

The invention provides a projection type image-displaying system in which a user can readily adjust brightness and color purity of a projected image, a projection type image-displaying apparatus, and a lamp lighting-controlling method. A projector apparatus (10) recognizes an apparatus (a PC apparatus (30) or a recording / reproducing apparatus (40)) connected to the projector apparatus (10), and a user or designer selects an image mode menu corresponding to an image signal input and causes the image mode menu thus selected to be displayed on a screen (50). As a result, when a projection type image-displaying system is used, the user or designer can readily and intuitively adjust brightness and color purity in order to obtain ones which he / she likes while looking at an image displayed on the screen (50).

The present invention relates to a thin film light emitting element which has low drive voltage. In particular, the present invention relates to a thin film light emitting element which has low drive voltage and in which color purity and luminous efficiency are not deteriorated. A structure of a light emitting element of the present invention comprises at least an electron transporting layer, a light emitting layer containing a luminescent substance, a first region, and a second region are provided between electrodes, wherein the electron transporting layer includes the second region between the light emitting layer and the first region, the first region includes a substance containing a plycyclic condensed ring, and the second region does not include the substance containing a polycyclic condensed ring.