Leuchtstoffwerk Breitungen Gmbh

Ledon Lighting Jennersdorf Gmbh

Tridonic Jennersdorf Gmbh

Cheng-Jun Duan

Detlef Starick

Sylke Rösler

Wolfgang Kempfert

Sven Rösler

Sven Roesler

Anne Charlotte Antoinette Delsing

Rudolf Dennstedt

Hubertus Theresia Hitzen

Theresia Hubertus Hintzen

Hubertus Theresia Hintzen

Anne Charlotte Anoinette Delsing

Rösler Sylke

This invention is related to efficient inorganic borophosphate phosphors which can applied in various technical applications such as fluorescent lamps, colored light or white light emitting diodes, and other devices where phosphors are used to convert especially near UV radiation into the visible light. Further, this invention is related to light sources comprising the efficient borophosphate phosphor. The inventive phosphor absorbs radiation in a first wavelength range of the electromagnetic spectrum and emits radiation in a second wavelength range of the electromagnetic spectrum. This phosphor is a borophosphate activated with divalent rare earth metal ions.

Borophosphate phosphor and light source

The present invention relates to alkaline earth metal silicate luminophores having improved long-term stability and to a corresponding method for improving the long-term stability of alkaline earth metal silicate luminophores. The luminophore according to the invention is a luminophore comprising a base lattice according to the general chemical formula EASiO, where x, y, z&#x3e;0. The component EA is formed by one or more alkaline earth metals. An activator, for example Euor Mn, is doped into the base lattice. The luminophore has the fundamental property to absorb radiation in a first wavelength range and emit radiation in a second wavelength range that is different from the first wavelength range. The luminophore is designed in the form of crystals. According to the invention, the surfaces of the crystals of the luminophore are chemically modified such that at least portions of the surfaces thereof are formed by a chemical compound of the general formula EaZ. The component Z is formed by anions, which can be chemically combined with the EA cations of the luminophore. The variable u is equal to an ion charge of the anions Z. The chemical modification is therefore not a coating.

Alkaline earth metal silicate luminophores and method for improving the long term stability thereof

The invention relates to a method of manufacturing a rare-earth doped alkaline-earth silicon nitride phosphor of a stoichiometric composition. Said method comprising the step of selecting one or more compounds each comprising at least one element of the group comprising the rare-earth elements (RE), the alkaline-earth elements (AE), silicon (Si) and nitrogen (N) and together comprising the necessary elements to form the rare-earth doped alkaline-earth silicon nitride phosphor (AESiN:RE). The method further comprises the step of bringing the compounds at an elevated temperature in reaction for forming the rare-earth doped alkaline-earth silicon nitride phosphor (AESiN:RE). In such a method normally a small amount of oxygen, whether intentionally or not-intentionally added, will be incorporated in the rare-earth doped alkaline-earth silicon nitride phosphor (AESiN:RE). According to the invention the creation of defects by formation of a non-stoichiometric oxygen containing phosphor is at least partly prevented by partly substituting for the ions (AE, Si, N) of the alkaline-earth silicon nitride phosphor (AESiN:RE) suitable further elements of the periodic system by which vacancies are created, filled or annihilated resulting in the formation of a modified alkaline-earth silicon nitride phosphor (AESiN:RE) having a stoichiometric composition. In this way a modified phosphor is obtained having excellent and stable optical properties. The invention further relates to a modified phosphor obtainable by the above-mentioned method and a radiation converting device comprising such a phosphor.

Rare-earth doped alkaline-earth silicon nitride phosphor, method for producing and radiation converting device comprising such a phosphor

This invention is related to efficient anorganic phosphors, which are based on an oxysulfide host lattice of the general formula ABOS:M. Furthermore, this invention is related to the use of these phosphors in various technical applications such as fluorescent lamps, colored light or white light emitting LEDs, scanning beam displays working with UV or purple laser as exciting source and other devices in order to convert especially UV or NUV radiation or short-wave visible light into an useful longer-wave visible radiation. This invention is also related to light sources and/or display applications that contain the inventive phosphor. An inventive phosphor shows the general formula ABOS:M, where A is at least one element selected from the group consisting of Ca, Mg, Sr, and Ba; B is at least one element selected from the group consisting of Zn and Mg; M is at least one first element selected from the group consisting of Mn, Cu, and Eu, Pb, Sb, Sn, Bi, Ce, Tb, and Pr; and additionally at least one second element selected from the group consisting of Mn, Cu, Cu, Ag, Pb, Sb, Sn, Bi, Eu, Ce, Tb, Prand Laas well as Li, Na, K, and Rb, wherein at least one of the second elements is different from every one of the first elements.

ABOS:M-based phosphors and light sources containing these phosphors

Growing community of inventors

Bad Salzungen, Germany

Cheng-Jun Duan