996results about How to "Efficient emissions" patented technology

The present invention relates to organic light emitting devices (OLEDs), and more specifically to OLEDS that emit light using a combination of fluorescent emitters and phosphorescent emitters for the efficient utilization of all of the electrically generated excitons.

Presently, many variations of light treatment are used in health care. Prime examples are the in-vivo or ex-vivo photodynamic treatment (PDT) of skin diseases, cancer/tumors, psoriasis, mood disorders, bladder infections, promoting wound closure, recovering spinal cord injuries, and countering muscle/bone atrophy. PDT is a treatment that uses a drug, called a photo-sensitizer or photosensitizing agent, and a particular type of light. The invention relates to an improved PDT device.

A light emitting layer including a plurality of light emitting particles embedded within a host matrix material. Each of said light emitting particles includes a population of semiconductor nanoparticles embedded within a polymeric encapsulation medium. A method of fabricating a light emitting layer comprising a plurality of light emitting particles embedded within a host matrix material, each of said light emitting particles comprising a population of semiconductor nanoparticles embedded within a polymeric encapsulation medium. The method comprises providing a dispersion containing said light emitting particles, depositing said dispersion to form a film, and processing said film to produce said light emitting layer.

A specific derivative of heterocyclic compound having nitrogen atom and an organic electroluminescence device comprising the compound. An organic electroluminescence device comprising at least one of organic compound layers including a light emitting layer sandwiched between an anode and a cathode, wherein said at least one of the organic compound layers comprises the derivative of the heterocyclic compound having nitrogen atom as a sole component or as mixed component. The organic electroluminescence device achieves elevation of luminance and excellent efficiency of light emission, and also achieves long lifetime by an improvement of an electrode adhesion.

A plurality of mirror surfaces (5), which extend in a direction (X-axis direction) perpendicular to a light incident surface (2a), are formed side by side in a longitudinal direction (Y-axis direction) of the light incident surface (2a) on a light distribution control surface (4a) of both surfaces (4a, 4b) of a light guide plate (1) in a thickness direction (Z-axis direction) thereof, and a plurality of prisms (7) extending in the Y-axis direction are formed side by side in the X-axis direction in areas other than the mirror surfaces (5). The mirror surfaces 5 are formed in such a way that Y-axis direction widths thereof vary in the X-axis direction. This enables the setting of the light distribution characteristics and luminance distribution of emitted light, which are viewed in two directions, namely a longitudinal direction of the light incident surface of the light guide plate and the direction perpendicular to the light incident surface, to target light distribution characteristics and luminance distribution.

Disclosed herein is a secondary battery having a mechanical connection sensor, as a safety device, fixed to the outer surface of a prismatic or pouch-shaped battery cell while the mechanical connection sensor is set to OFF. The mechanical connection sensor is connected in series with a resistor having a predetermined resistance value and with a cathode and an anode of the battery cell. When the battery cell swells to a critical value or more due to the abnormal operation of the battery cell, the mechanical connection sensor is turned ON, and therefore, the mechanical connection sensor conducts with the result that the electrical energy of the battery cell is consumed at the resistor. In the secondary battery having the safety device according to the present invention, when the battery swells due to the abnormal response of the battery, energy accumulated in the battery is forcibly consumed, unlike a conventional battery that merely intercepts the current. As a result, the continuous occurrence of the abnormal response is fundamentally prevented, and therefore, more rapid process is possible with excellent pressure sensitivity. Consequently, the safety of the battery is improved.

Provided is an LED package. It is easy to control luminance according to the luminance and an angle applicable. Since heat is efficiently emitted, the LED package is easily applicable to a high luminance LED. The manufacturing process is convenient and the cost is reduced. The LED package includes a substrate, an electrode, an LED, and a heatsink hole. The electrode is formed on the substrate. The LED is mounted in a side of the substrate and is electrically connected to the electrode. The heatsink hole is formed to pass through the substrate, for emitting out heat generated from the LED.

The invention provides an oxynitride phosphor represented by a composition formula M_1-aCe_aSi_bAl_cO_dN_e, wherein M denotes La or a compound of which main component is La and sub-component is at least one kind of element selected from the group consisting of Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu; the a that represents a composition ratio of Ce is a real number satisfying 0.1≦a≦1; the b that represents a composition ratio of Si is a real number satisfying b=(6−z)×f; the c that represents a composition ratio of Al is a real number satisfying c=(1+z)×g; the d that represents a composition ratio of O is a real number satisfying d=z×h; the e that represents a composition ratio of N is a real number satisfying e=(10−z)×i; the z is a real number satisfying 0.1≦z≦3; the f is a real number satisfying 0.7≦f≦1.3; the g is a real number satisfying 0.7≦g≦3; the h is a real number satisfying 0.7≦h≦3; the i is a real number satisfying 0.7≦i≦1.3; and a JEM phase is contained in an amount of 50% or more, and a semiconductor light-emitting device that uses the oxynitride phosphor.

A light emitting device having a phosphor substrate, which comprises nitride containing at least one element selected from Group XIII (IUPAC 1989) having a general formula XN, wherein X is at least one element selected from B, Al, Ga and In, a general formula XN:Y, wherein X is at least one element selected from B, Al, Ga and In, and Y is at least one element selected from Be, Mg, Ca, Sr, Ba, Zn, Cd and Hg, or a general formula XN:Y,Z, wherein X is at least one element selected from B, Al, Ga and In, Y is at least one element selected from Be, Mg, Ca, Sr, Ba, Zn, Cd and Hg, and Z is at least one element selected from C, Si, Ge, Sn, Pb, O and S. The phosphor substrate is prepared by crystallization from supercritical ammonia-containing solution and the light emitting device is formed by a vapor phase growth on the phosphor substrate so as to obtain a light emitting device which has a wavelength distribution emitting a white light etc. and a good yield.

[Problem]To provide a light diffusing sheet which enables the light from a lightguide plate or light source of the backlight unit to be conducted to lens film after having been converted to diffused light having a small brightness peak angle, and which generates neither a moiré or interference fringe nor luminance unevenness, and is advantageous also from the standpoints of productivity and cost, and to provide a backlight unit having this light diffusing sheet incorporated therein. [Means for Solution]

The invention is composed of a light diffusing sheet 10 comprising a light-transmitting resin, characterized by having fine recesses formed in at least one of the surfaces 2 thereof, the fine recesses 3 having a shape which is any of the shape of an inverted polyangular pyramid, the shape of an inverted truncated polyangular pyramid, the shape of an inverted cone, and the shape of an inverted truncated cone. brightness peak angle of diffused light is reduced, which restrains both a moiré and interference fringe, according to light refraction due to inclined face of fine recess 3 or a taper face. The invention is composed of a backlight unit characterized by including the light diffusing sheet and has been disposed on upper side of lightguide plate 20, or in front of a light source, so that that surface of the sheet which has fine recesses formed therein serves as a light emission side.

A light-emitting device includes a light-emitting element emitting primary light and a wavelength conversion portion absorbing a part of the primary light and emitting secondary light having a wavelength equal to or longer than the wavelength of the primary light. The wavelength conversion portion includes a plurality of green or yellow light-emitting phosphors and a plurality of red light-emitting phosphors. The green or yellow light-emitting phosphor is implemented by at least one selected from a specific europium (II)-activated silicate phosphor (A-1) and a specific cerium (III)-activated silicate phosphor (A-2). The red light-emitting phosphor is implemented by a specific europium (II)-activated nitride phosphor (B). The light-emitting device emitting white light at efficiency and color rendering property higher than in a conventional example can thus be provided.

A light-scattering body includes at least light-transmitting resin, and first particles and second particles which are dispersed in the light-transmitting resin. An average grain size Da of the first particles is greater than an average grain size Db of the second particles. A refractive index na of the first particles is less than a refractive index nb of the second particles. The average grain size Db of the second particles is within a range of 150 nm≦Db≦300 nm.

An endoscope system has an insertion portion and a control portion connected to a base end portion of the insertion portion. An illumination system includes a light guide having a front end positioned near the front end of the insertion portion and a rear end positioned rearward of the base end of the insertion portion, phosphors disposed in the light guide toward the front end thereof and an illumination light source which is positioned toward the rear end of the light guide and emits stimulating light exciting the phosphors.

An image display device includes an image generating device, a light guide unit which includes a light guide plate and first and second deflection sections, and a light beam extension device which extends light incident from the image generating device, along a Z direction when an incident direction of light incident on the light guide plate is set to be an X direction and a direction of propagation of light in the light guide plate is set to be a Y direction, and emits the light to the light guide unit, wherein the light beam extension device includes a first reflecting mirror on which light from the image generating device is incident, and a second reflecting mirror which emits light incident from the first reflecting mirror to the light guide unit, and each of the first and second reflecting mirrors has a light reflecting surface having a sawtooth-shaped cross-sectional shape.

A discharge electrode emitting electrons into a discharge gas, encompasses an emitter and current supply terminals configured to supply electric current to the emitter. The emitter embraces a wide bandgap semiconductor having at 300 K a bandgap of 2.2 eV or wider. Acceptor impurity atoms and donor impurity atoms being doped in the wide bandgap semiconductor, the activation energy of the donor impurity atoms being larger than the activation energy of the acceptor impurity atoms.

A novel aromatic compound having an anthracene skeleton structure and an asymmetric molecular structure; and an organic electroluminescence device which comprises a cathode, an anode and an organic thin film layer comprising at least one layer containing a light emitting layer and sandwiched between the cathode and the anode in which at least one layer in the organic thin film layer contains the above novel aromatic compound singly or as a component of a mixture. The organic electroluminescence device exhibits a great luminance of emitted light, a great efficiency of light emission and a high purity of color, emits bluish light, is excellent in stability at high temperatures and has a long life. The organic electroluminescence device can be provided by utilizing the novel aromatic compound.

The planar lighting device includes a light guide plate including two symmetrical, inclined planes increasingly distanced from the light exit plane with the increasing distance from the light entrance planes toward the center, a curved portion joining the inclined planes, and scattering particles dispersed therein; light sources; a housing; a securing unit securing the light sources and light guide plate to keep their distance constant, and a sliding mechanism allowing the securing unit to slide. Distance between the light entrance planes, thicknesses at the light entrance planes and at the central curved portion, its radius of curvature and taper of the inclined planes are all held within respective given ranges as well as scattering particle diameter and density, light use efficiency and middle-high ratio of the brightness distribution. A thin planar lighting device yielding high light use efficiency with a minimized brightness unevenness and a high-in-the-middle brightness distribution.

A headlamp (1) includes a laser diode (2) for emitting a laser beam and a light-emitting section (5), which contains a fluorescent substance for emitting fluorescence upon receiving the laser beam emitted from the laser diode (2) and diffusing particles (15) for diffusing the laser beam.

An object is to provide a white light-emitting element which emits broad white light which is close to natural light and covers a wide wavelength range; that is, a white light-emitting element which has a broad spectrum waveform. Further, there are various different kinds of white light; however, in particular, an object is to provide a white light-emitting element which emits white light which is close to the standard white color of the NTSC. Over a substrate 100, a second light-emitting element 110 and a first light-emitting element 120 are stacked in series. The first light-emitting element 120 exhibits a light emission spectrum having two peaks (two peaks in the blue to green wavelength range) and is disposed close to a film of light-reflecting material. The second light-emitting element 110 exhibits a light emission spectrum having a peak in the orange to red wavelength range, and is disposed in a position which is not close to the film of light-reflecting material.

A light-emitting diode with high luminous efficiency is provided which is free from deformation or defects of a crystal caused by a dopant. The light-emitting diode emits no light of unnecessary wavelengths and has a wide selection of emission wavelengths. The light-emitting diode comprises a light-emitting layer made of an ambipolar semiconductor containing no dopant, and an electron implanting electrode, that is, an n-electrode and a hole implanting electrode, that is, a p-electrode joined to the light-emitting layer.

An EL element includes, between an anode and a cathode, an emissive element layer including a plurality of emissive layers. The emissive element layer includes two or more organic layers containing a hole transporting compound, and one or more of the plurality of emissive layers contain the hole transporting compound. The concentration of the hole transporting compound in the organic layer which is formed closest to the electron injecting electrode among the organic layers containing the hole transporting compound is lower than the concentration of the hole transporting compound in the organic layer which is formed closest to the hole injecting electrode. When three or more organic layers contain a hole transporting compound, the concentration of the hole transporting compound contained in each organic layer can be set such that, as the organic layer is further away from the hole injecting electrode, the concentration is lower. With this setting, the supply amount and supply timing of holes and electrons can be optimized easily with regard to each of the plurality of emissive layers, so that uniform light emission can be generated in any one of the emissive layers.