Seoul Semiconductor Co., Ltd.

Li-tec Gmbh

Toyoda Gosei Co., Ltd.

Bundesdruckerei Gmbh

Leuchtstoffwerk Breitungen Gmbh

Tridonic Optoelectronics Gmbh

Litec Gbr

Leuchstoffwerk Breitungen Gmbh

Other

Ledon Lighting Jennersdorf Gmbh

Bundesdruckeri Gmbh

Triodonic.atco Optoelectronics Gmbh

Fa. Leuchtstoffwerk Breitungen Gmbh

Tridonic Jennersdorf Gmbh

Detlef Starick

Walter Tews

Gundula Roth

Chung Hoon Lee

Wolfgang Kempfert

Peter Pachler

Stefan Tasch

Manfred Paeschke

Sylke Rösler

Sven Rösler

Monika Voh

Koichi Ota

Atsuo Hirano

Akihito Ota

Benedikt Ahlers

Andreas Deichsel

Arnim Franz-Burgholz

Olga Kulikovska

Frank Kappe

Florian Peters

Cheng-Jun Duan

Wolfgang Schmidt

Joerg Fischer

Jörg Fischer

Oliver Muth

Anett Bailleu

Paul Hartmann

Ilya Komarov

Frank Fritze

Matthias Koch

Roland Heise

Guido Haussmann

Hans Hoschopf

Christian Kunath

Hubertus Thoresia Hintzen

Jakob Kuen

Sven Roesler

Anne Charlotte Antoinette Delsing

Yuan Qiang Li

Hans-Jürgen Limburg

Adrie Bos

Arnim Franz-Burgholtz

Hubertus Theresia Hitzen

Theresia Hubertus Hintzen

Thomas Jüstel

Lazar Kulikovsky

Viktor Anselm

Anne Charlotte Anoinette Delsing

Hubertus Theresia Jozef Maria Hintzen

Rösler Sylke

Hubertus Theresia Hintzen

Frank Kasten

Mario Eberhardt

Beata Malysa

Guido HAUßMANN

Gustav Martin Bartel

Andre Joseph

Cornelia Vandahl

Stefan Tschorn

Mario Vonrüty

Tatjana Sauer

A security feature is presented for a security or value document. The security feature comprises a zinc sulfide luminophore in the form of particles. The zinc sulfide luminophore has the general chemical formula ZnS:Cu, M, X; here, M represents one or more elements from a group comprising the chemical elements Co, In and Ni; X represents one or more elements from a group comprising the halides F, Cl, Br and I; and the following applies: 0<x<0.002 and 0::; y<0.00015 and 0::; z<0.00050. The particles each have cubic phase portions and hexagonal phase portions. When excited by an electrical field, the zinc sulfide luminophore emits a first radiation in the range of the light spectrum between 580 nm and 780 nm. When excited by heating the luminophore to a temperature between 100° C. and 150° C., the zinc sulfide luminophore emits a second radiation in the light spectrum.

Security feature and method for the detection thereof, and security or value document

The present invention firstly relates to a security feature for a security or value document. The security feature comprises a zinc sulfide luminophore in the form of particles. The zinc sulfide luminophore has the general chemical formula ZnS: Cu, M, X; here, M represents one or more elements from a group comprising the chemical elements Co, In and Ni; X represents one or more elements from a group comprising the halides F, Cl, Br and I; and the following applies: 0<x<0.002 and 0≤y<0.00015 and 0≤z<0.00050. The particles each have cubic phase portions and hexagonal phase portions. When excited by an electrical field, the zinc sulfide luminophore emits a first radiation in the range of the light spectrum between 580 nm and 780 nm. When excited by heating the luminophore to a temperature between 100° C. and 150° C., the zinc sulfide luminophore emits a second radiation in the light spectrum. Furthermore, the invention relates to a security and value document, which may for example be a bank note or a passport, an identity card, a driving license or a postage stamp. The invention also relates to a method for detecting and/or verifying the security feature according to the invention.

A light emitting device including a housing, a plurality of heat-sinks adjoined to the housing and insulated from each other, a bottom surface of the heat-sinks being exposed to the outside, a light emitting diode mounted on at least one of the heat-sinks via a conductive adhesive, and a molding member encapsulating the light emitting diode and including thermosetting resin, in which a fluoride luminophore including I and IV group elements with fluorine and other luminophore are dispersed in the molding member, and the luminophores are configured to absorb at least a portion of light emitted from the light emitting diode and emit light having a wavelength different from that of the absorbed light.

Light-emitting device having surface-modified luminophores

A method and a device check a security element of a security document. The security element contains at least one particulate substance with electroluminescent properties and at least one field suppression element. The method includes applying an electric excitation field to the security element, generating an optical image of at least one region of the security element after or during the production of the electric excitation field, and detecting local intensity maxima in the optical image. The security element is verified if a number of local intensity maxima present at different image positions is greater than or equal to a specified number, the number being at least two.

Method and device for checking a security element

Method and device for testing a security element () of a security document, the security element () being able to contain at least one substance () which has optically variable properties, including the following method steps: illuminating the security element () with at least one predetermined illumination parameter, filtering the light reflected by the security element into a first component (RLp) having a first polarisation, determining an intensity (I) of the first component (RLp) of reflected light reflected at a reflection angle (&#x3d5;), for at least one reflection angle (&#x3d5;), and verifying the presence of a substance () which has optically variable properties as a function of the intensity (I) of the first component (RLp).

Method and device for testing a security element of a security document

A light-emitting device including a substrate, a first light-emitting diode disposed on the substrate, a molding member encapsulating the first light-emitting diode, and luminophores dispersed in the molding member and including a surface-modified luminophore, in which the surface-modified luminophore includes a fluorinated coating and a fluoride luminophore including a manganese activator. The fluoride luminophore is selected from the group consisting of KSiF, NaSiF, RbSiF, KGeF, NaGeF, and RbGeF.

The present invention relates to a zinc sulphide phosphor and to a process for producing same. The invention further relates to a security document or document of value, to a security feature and to a method for detecting same. The phosphor according to the invention can act as electroluminescent phosphor and thus be excited by an electrical field, and this can result in emission of electroluminescent light in the blue and/or green color region of the visible spectrum. The phosphor can moreover be excited by UV radiation in the wavelength range than 345 nm to 370 nm, and can thus emit photoluminescent light in the blue color region of the visible spectrum. The phosphor can moreover be excited by UV radiation in the wavelength range from 310 nm in 335 nm, and can thus emit photoluminescent light in the green color region of the visible spectrum.

Zinc sulphide phosphor having photo- and electroluminescent properties, process for producing same, and security document, security feature and method for detecting same

A light-emitting device including a light-emitting diode and a surface-modified luminophore. The surface-modified luminophore includes a luminophore including a manganese activator and a fluorine compound fixed to the luminophore.

Light emitting device having surface-modified luminophores

A surface-modified quantum dot luminophore includes a quantum dot luminophore and a coating includes a fluorinated coating including a fluorinated inorganic agent, a fluorinated organic agent, or a combination of fluorinated inorganic and organic agents, the fluorinated coating generating hydrophobic surface sites and the coating is disposed on the surface of the silicate luminophore.

Surface-modified quantum dot luminophores

Exemplary embodiments of the present invention relate to a light emitting device including a light emitting diode and a surface-modified luminophore. The surface-modified luminophore includes a quantum dot luminophore and a fluorinated coating arranged on the quantum dot luminophore.

Light emitting device having surface-modified quantum dot luminophores

Exemplary embodiments of the present invention relate to light emitting devices including strontium oxyorthosilicate-type phosphors. The light emitting device includes a light emitting diode, which emits light in the UV or visible range, and phosphors disposed around the light emitting diode to absorb light emitted from the light emitting diode and emit light having a different wavelength from the absorbed light. The phosphors include an oxyorthosilicate phosphor having a general formula of SrCaMSiO: Euwith a calcium molar fraction in the range of 0&#x3c;x&#x2266;0.05.

Light emitting device having strontium oxyorthosilicate type phosphors

A surface-modified silicate luminophore includes a silicate luminophore and a coating includes at least one of (a) a fluorinated coating including a fluorinated inorganic agent, a fluorinated organic agent, or a combination of fluorinated inorganic and organic agents, the fluorinated coating generating hydrophobic surface sites and (b) a combination of the fluorinated coating and at least one moisture barrier layer. The moisture barrier layer includes MgO, AlO, YO, LaO, GdO, LuO, and SiOor the corresponding precursors, and the coating is disposed on the surface of the silicate luminophore.

Surface-modified silicate luminophores

Exemplary embodiments of the present invention disclose inorganic luminescent substances with Eu-doped silicate luminophores, in which solid solutions in the form of mixed phases between alkaline earth metal oxyorthosilicates and rare earth metal oxyorthosilicates are used as base lattices for the Euactivation leading to the luminescence. These luminophores are described by the general formula (1-x) MSiO.xSESiO:Eu, in which Mpreferably represents strontium ion or another alkaline earth metal ion, or another divalent metal ion selected from the group consisting of the magnesium, calcium, barium, copper, zinc, and manganese. These ions may be used in addition to strontium and also as mixtures with one another.

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Exemplary embodiments of the present invention relate to a light emitting device including a light emitting diode and a surface-modified luminophore. The surface-modified luminophore includes a silicate luminophore and a fluorinated coating arranged on the silicate luminophore.

Light emitting device having surface-modified silicate luminophores

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

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Greifswald, Germany

Detlef Starick