Abstract: The present invention provides a method of monitoring performance of a discharge lamp. The discharge lamp includes electrodes and a discharge vessel filled with gas and equipped with a luminescent layer, wherein the gas is intended to emit a first ultraviolet light in a first spectral range when the gas is excited by an electric field produced by the electrodes, and at least part of the first ultraviolet light is intended to be changed into a second ultraviolet light in a second spectral range of longer wavelength than the first spectral range by the luminescent layer. The method comprises the steps of finding the value of a first intensity of the first ultraviolet light; finding the value of a second intensity of the second ultraviolet light; and determining the conversion efficiency of the luminescent layer for converting the first ultraviolet light into the second ultraviolet light on the basis of the ratio of the value of the second intensity to the value of the first intensity.

Abstract: The invention relates to a light emitting device (1) with high colour rendering comprising a wavelength converting member (2) with a luminescent medium for wavelength conversion of blue light and/or ultraviolet light (10) into red light and/or yellow and/or green light and a light source (3) emitting blue light (10) and/or ultraviolet light arranged to pump the luminescent medium, said luminescent medium essentially having a main phase of a solid state host material which is doped with Ce3+-ions. According to the invention the host material comprises ions of a further rare-earth material Ln, wherein the host material is selected such that the emission energy of the 5d-4f emission on Ce3+-ions is energetically higher than the absorption energy into an upper 4fn state of the further rare-earth material Ln, and wherein the light emission of wavelength converted light is caused by an intra-atomic 4fn-4fn transition within the ions of the further rare-earth material.

Abstract: The present invention relates to a light source, which produces light leaving the light source with modifiable color and luminosity, with at least one light emitting diode for emitting primary radiation, comprising a layer connected with said diode, wherein said layer includes at least one luminescent material for converting the primary radiation into a secondary radiation.

Abstract: The invention relates to a solid-state laser device (1) comprising a gain medium (10) essentially having a main phase of a solid state host material (15) which is doped with rare-earth ions.

Abstract: The present invention is directed to a Gd2O2S:M fluorescent ceramic material with a very short afterglow, wherein M represents at least one element selected from the group Pr, Th, Yb, Dy, Sm and/or Ho and the Gd2O2S:M fluorescent ceramic material comprises further: europium of ?1 wt. ppm based on Gd2O2S, and cerium of ?0.1 wt. ppm to ?100 wt. ppm based on Gd2O2S, wherein the content of cerium is in excess of the content of europium with a ratio of europium to cerium of 1:10 to 1:150.

Abstract: The present invention relates to a fluorescent ceramic having the general formula Gd2O2S doped with M, whereby M represents at least one element selected form the group Ce, Pr, Eu, Tb, Yb, Dy, Sm and/or Ho, whereby said fluorescent ceramic comprises a single phase in its volume; to a method for manufacturing a fluorescent ceramic using single-axis hot pressing; a detector for detecting ionizing radiation and to a use of said detector for detecting ionizing radiation. The method for manufacture of a fluorescent ceramic material using a single-axis hot pressing, comprises the steps: a) selecting a pigment powder of Gd2O2S doped with M, and M represents at least one element selected from the group of Eu, Tb, Yb, Dy, Sm, Ho, Ce and/or Pr, whereby the grain size of said powder used for hot-pressing is of 1 ?m, and said hot-pressing is carried out at—a temperature of 1000° C. to 1400° C.; and/or—a pressure of 100 Mpa to 300 MPa; air annealing at a temperature of 700° C. to 1200° for a time period of 0.

Abstract: A tungstate-based scintillating material and a method for using a tungstate-based scintillating material is provided. In addition, a radiation detector and an imaging device incorporating a tungstate-based scintillating material are provided.

Abstract: The invention relates to a Gd2O2S:Nd fluorescent material and the use of Nd3+ as emitter in suitable materials.

Abstract: A tanning device is described that includes semiconductor light-emitting diodes (LEDs) as a light source, which LEDs are preferably composed of (InGa)N, (AlGa)N, (AlInGa)N or (AlInGa)P as their semiconductor material.

Abstract: The invention relates to a light emitting diode device comprising a light emitting layer (103) and a filter layer (105) arranged on a surface of the light emitting layer (103), the filter layer (105) being adopted to receive light from the light emitting layer, to pass light components within a predetermined angular range and not to pass light components outside the predetermined angular range.

Abstract: The present invention relates to light-based communication, and more particularly it relates to methods for configuration of at least one remote light-sensing device, to a central light-emitting unit and to a light-sensing device. According to the invention, spatial configuration of remote light-sensing devices (e.g. peripherals such as loudspeakers or light devices), will be achieved by transmission of embedded identifiers or configuration information in light emitted in a plurality of directions from a central light-emitting unit. With a different identifier or different configuration information for each direction of transmission, the directions can be distinguished from each other. The invention enables a user to place remote light-sensing devices in a desired spatial position and the central light-emitting unit will be able to determine location and spatial function, i.e. for example whether the peripheral is an audio device and/or a lighting device.

Abstract: The invention relates to an illumination device (10) for illuminating a surface, with a lighting element (20) and an illuminating body (30), wherein the lighting element (20) emits an artificial light (21,21?), a housing element (40) comprises the lighting element (20) and supports the illuminating body (30), the illuminating body (30) comprises a transparent light conductive material and is generally overlying the surface, being illuminated. The invention discloses, that the illuminating body (30) comprises a light extraction layer (50), configured to receive and to deflect the artificial light (21,21?) from the lighting element (20) onto the surface.

Abstract: An illumination device (1) for illuminating an object comprising a light source (2) to emit light (21), an adjustable optical element (3) for adjusting the light (21) originated from the light source (2) into adjusted light (31), and a controller (4) for controlling at least one element of a group of elements comprising the adjustable optical element (3) and the light source (2) in response to an adjusting control signal (71) via at least one driving signal (75, 76).

Abstract: The invention relates to an illumination system with a material having a low or negative thermal expansion coefficient in order to compensate for the thermal expansion of the further materials present in the illumination system.

Abstract: The present invention relates to a light source, which produces light leaving the light source with modifiable colour and luminosity, with at least one light emitting diode for emitting primary radiation, comprising a layer connected with said diode, wherein said layer includes at least one luminescent material for converting the primary radiation into a secondary radiation.

Abstract: A scintillation element comprises a scintillation material, and a reflective layer, wherein the reflective layer is formed as an intrinsic part of the scintillation material. Preferably, a plurality of scintillation elements may be arranged to form a scintillation array. A method for producing a scintillation element comprises providing a scintillation material, and producing a reflective layer at the scintillation material by exposing the scintillation material to physical and/or chemical conditions in such a way that the reflective layer is formed out of a part of the scintillation material.

Abstract: A cathode for electron emission, comprising a heating device (1, 2) for generating temperatures above 300° C., an electrically conductive cathode support (3) which is connected to the heating device (1, 2), and a cathode coating which is applied to the cathode support (3) and consists of an electron-emitting material (4) comprising at least one alkali metal selected from the group consisting of sodium, potassium, rubidium and cesium, with an emission current density >10 A/m2 at an operating temperature between 300° C. and 600° C.

Abstract: A device (100) for activating a physiologically effective substance (101) by ultrasonic waves (103, 105), the device comprising an ultrasonic transducer (102) adapted to generate ultrasonic waves (103), a focusing element (104) adapted to focus the generated ultrasonic waves (103), and an adjustment unit (107) adapted to adjust a position (106) to which the focusing element (105) focuses the generated ultrasonic waves (103) in a manner that the focused ultrasonic waves (103) are bringable in interaction with the physiologically effective substance (101) at the adjusted position (106).

Abstract: The invention relates to a marking system comprising lighting devices, for example LEDs (11), that are used on a sport area (1) to indicate demarcations (100) of different games. By activating the associated lighting devices (11), the demarcations (100) of a particular game can selectively be made visible. The marking system may further comprise detection devices that can detect the occurrence of certain game events. Thus photodetectors (12) may for example detect if a ball (2) crosses a demarcation (100). A controller (13) may then activate the lighting devices (11) or separate signaling devices (14, 15) to indicate the detected event. The controller (13) may further communicate wirelessly with persons on the sport area, particularly with the referee to assist his/her decisions.

Abstract: The invention relates to nanoparticles coated with an inorganic nanoscale material herein referred to as core-shell nanoparticle, in which the core material has a wider band gap than the shell material. The described core-shell nanoparticles are very suitable for the application in photodynamic therapy due to their enhanced energy transfer ability.