摘要:
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.
摘要:
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 Ce 3+ -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 Ce 3+ -ions is energetically higher than the absorption energy into an upper 4f n state of the further rare-earth material Ln, and wherein the light emission of wavelength converted light is caused by an intra-atomic 4f n - 4f n transition within the ions of the further rare-earth material. The invention further relates to a corresponding lighting system comprising the light-emitting device and a corresponding luminescent medium.
摘要:
The invention relates to GLS-look-alike LED light source (100) comprising two different types of LEDs (21, 22), preferably LEDs emitting with a near UV spectrum and a blue or white spectrum, respectively. The light source (100) further preferably comprises a transparent bulb (40) with a shape similar to an incandescent lamp that is coated by a luminescent layer (30) to achieve a white lamp spectrum. The luminescent layer may contain one or two luminescent compositions.
摘要:
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.
摘要:
The invention relates to a luminescent material comprising a luminescent particle (20) for generating light (4), wherein the luminescent particle (20) has a structured particle surface for effectively outcoupling the light (4) generated within the luminescent particle (20). Furthermore, the invention relates to a light source comprising a luminescent material according to the invention and a device for exciting the luminescent material.
摘要:
The invention relates to photonic materials with regularly arranged cavities, containing at least one colorant. The wall material of the photonic material has dielectric properties and acts as such in an essentially non-absorbing manner for the wavelength of an absorption band of the respective colorant and is essentially transparent to the wavelength of an emission of the colorant, which can be excited by the absorption wavelength, and the cavities are formed in such a manner that radiation of the wavelength of the weak absorption band of the colorant is stored in the photonic material. The invention also relates to the use of these photonic materials as luminous substance system in an illuminant, to corresponding illuminants and to production methods.
摘要:
The invention is concerned with an illumination system, comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is an oxido-nitrido-silicate of general formula EA2-zSi5-aBaN8-aOa:Lnz, wherein 0
摘要:
An EL structure is described, with a single ultraviolet or blue light emitting layer that is connected to a back electrode. The top surface comprises three separate segments for the primary colors red, green and blue. Another single phosphorescent blend or a two-component phosphorescent blend is deposited on at least two of the three segments. Each of the three segments can be individually driven by a corresponding top electrode. Thus, a single chip solution is provided for a LED with tunable visible light.
摘要:
A low-pressure vapor discharge lamp has a radiation-transmitting discharge vessel (1) enclosing, in a gastight manner, a discharge space (3) provided with a gas filling. The gas filling is substantially free of mercury and comprises an indium compound and a buffer gas. The discharge vessel (1) comprises discharge means (2) for maintaining a gas discharge in the discharge space (3). The discharge vessel (1) is provided with a luminescent layer (4). The luminescent layer (4) comprises a luminescent material based on a nitridosilicate or on an oxonitridosilicate. Preferably, the luminescent material comprises rare-earth emitters. Preferably, the luminescent material comprises europium, cerium, or ytterbium emitters.