Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Lumileds Lighting U.s., LLC

U.S. Philips Cororation

Koninkiljke Phillips Electronics N.v.

Thomas J&uuml;stel

Hans Nikol

Cornelis Reinder Ronda

Walter Mayr

Wolfgang Busselt

Helmut Bechtel

Jacqueline Merikhi

Herbert Friedrich B&ouml;rner

Peter Josef Schmidt

Dirk Jan Broer

Hans-Helmut Bechtel

Gerd O Mueller

Herbert Friedrich Boerner

Regina B Mueller-Mach

Detlef Uwe Wiechert

Claus Feldmann

Robert Van Asselt

Cornelis Jojakim Jalink

Dick Van Der Voort

Harald Gl&auml;ser

J&uuml;rgen Dirscherl

Gerry Sorce

Maya Angelova Doytcheva

Gerard Harbers

Johannes T W De Hair

A metal M is chosen from the group formed by yttrium, aluminum and lanthanum, and a watery solution of a complex of M and an organic chelating agent is added to a suspension of luminescent material, which causes a layer of M O to be deposited on the luminescent material, which is them separated, dried and fired.

Method of coating a luminescent material

A device includes a semiconductor light emitting device and a wavelength-converting material comprising Sr&mdash;SiON:Eu . The Sr&mdash;SiON:Eu wavelength-converting material absorbs light emitted by the light emitting device and emits light of a longer wavelength. The Sr&mdash;SiON:Eu wavelength-converting material may be combined with other wavelength-converting materials to make white light. In some embodiments, the Sr&mdash;SiON:Eu wavelength-converting layer is combined with a red-emitting wavelength-converting layer and a blue light emitting device to generate emission in colors, which are not achievable by only mixing primary and secondary wavelengths. In some embodiments, the Sr&mdash;SiON:Eu wavelength-converting layer is combined with a red-emitting wavelength-converting layer, a blue-emitting wavelength-converting layer, and a UV light emitting device.

Phosphor converted light emitting device

A liquid crystal color display screen is provided with an electro-optical medium, two parallel transparent substrates by which the electro-optical medium is flanked, a device that influences the transmission state of the electro-optical medium, and a phosphor layer having at least two phosphors on the first substrate. A radiation source emits radiation having a maximum emission at a wavelength &lgr; <360 nm. The radiation source is situated at the side of the second substrate. The screen also includes a UV phosphor that transforms the radiation having a maximum emission at a wavelength &lgr; <360 nm to radiation having a maximum emission at a wavelength &lgr; >360 nm.

Liquid crystal color display screen comprising a phosphor layer

A gas discharge lamp fitted with a gas discharge vessel filled with a gas filling is suitable for a gas discharge which emits VUV radiation, with a luminophore coating containing a down conversion luminophore and with means for igniting and maintaining a gas discharge in which the down conversion luminophore has in a host lattice a pair of activators of the a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group of the copper (I) ion, silver (I) ion, gold (I) ion, zinc (II) ion, gallium (III) ion, indium (III) ion, thallium (III) ion, germanium (IV) ion, tin (IV) ion and lead (IV) ion, is environmentally friendly and has a high lamp efficiency &eegr; . The invention also concerns a down conversion luminophore which in a host lattice has a pair of activators of a first lanthanoid ion and a second lanthanoid ion and a sensitizer selected from the group of the copper (I) ion, silver (I) ion, gold (I) ion, zinc (II) ion, gallium (III) ion, indium (III) ion, thallium (III) ion, germanium (IV) ion, tin (IV) ion and lead (IV) ion.

Gas discharge lamp with down conversion luminophore

A plasma picture screen fitted with a phosphor layer comprising a red phosphor activated by Eu shows an improved red color point (x&gE;0.64 and y&lE;0.35) and shorter decay times &tgr; as compared with the standard phosphor (Y,Gd)BO . The phosphor according to the invention has a lattice in which the activator Eu occupies a location which has no inversion symmetry.

Plasma picture screen with red phosphor

The invention describes a liquid crystal color picture screen with an improved luminous efficacy and an improved viewing angle. The liquid crystal color picture screen comprises a photoluminescent layer ( ) which contains a dichroically absorbing color agent and an isotropically emitting color agent.

Liquid crystal color picture screen

A plasma picture screen, in particular an AC plasma picture screen with a coplanar arrangement having an enhanced luminance. A UV light emitting layer ( ) is provided on the front plate ( ), which comprises a glass plate ( ) on which a dielectric layer ( ) and a protective layer ( ) are provided, or on the carrier plate ( ) with the phosphor ( ). The layer ( ) comprises a VUV phosphor which converts the VUV light of the plasma discharge into UV light with a wavelength between 200 and 350 nm and emits this in the direction of the phosphor layer ( ).

Plasma picture screen with UV light emitting layer

A plasma display screen including a carrier plate, a transparent front plate, a ribbed structure which divides the space between the carrier plate and the front plate into plasma cells, which are filled with a gas, and including one or more electrode arrays for generating corona discharges in the plasma cells, and including a phosphor layer which includes a phosphor for generating red radiation selected from the group formed by rare earth metal borates of the general formula EA M M Eu B O , where EA&equals;Ca, Sr, Ba; M &equals;Gd, La; M &equals;Y, Lu, Sc, In and 0<x&lE;0.5, 0.01&lE;y&lE;0.4, and M Y Eu BO , where M &equals;Sc,, In, Lu and 0.01&lE;r&lE;0.99, 0.01&lE;s&lE;0.15, is characterized by a red point which has shifted in the direction of a higher color saturation. In addition, the color contrast at brighter ambient lighting conditions is increased.

Plasma display screen comprising a red phosphor

A metal M is chosen from the group formed by Y, Al and La, and a watery solution of a complex of M and an organic chelating agent is added to a suspension of luminescent material, which causes a layer of M O to be deposited on the luminescent material, which is then separated, dried, and fired.

Coating for a luminescent material

Willemite (Zn SiO :Mn) is doped with one or more ions selected from the group formed by Gd , Eu , Co , Ce , Pr , Nd , Sm , Tb , Dy , Ho , Er , Tm and Yb . This results in a increase in absorption and quantum yield and a decrease of the decay time.

Zinc silicate luminescent materials and related luminescent screen products

A luminescent material is dispersed in a watery solution of sodium polyphosphate, a watery solution of a nitrate of the metal M is added, after which the luminescent material is separated, dried and fired. The metal is chosen from the group consisting of Ca, Sr, and Ba, whereby a protective layer of metal polyphosphate is formed on the luminescent material.

Luminescent material coated with a protective layer

The device for disinfecting water comprises a gas discharge lamp including a discharge vessel with walls composed of a dielectric material, which walls are provided on their outer surfaces with at least a first and a second electrode, and which discharge vessel contains a gas filling containing xenon, the inner surface of the walls being at least partly covered with a coating containing a phosphor emitting in the UV-C range. Such a device for disinfecting water can always be made 100% operation within milliseconds, and the UV-radiation of the device has a spectral composition which lies exclusively in the range relevant for disinfecting, i.e. between 230 and 300 nm.

Device for disinfecting water comprising a UV-C gas discharge lamp

An organic light-emitting diode comprising a laminated structure including, in succession, a substrate layer, a first electrode layer, a layer including a p-conductive material, a layer including a complex compound of terbium with organic ligands, a layer including an n-conductive material and a second electrode, the complex compound of terbium with organic ligands having the following composition: TbL(C H OH) , wherein L&equals;N,N&prime;,N&Prime;-Tris-(3-R &mdash;,5-R -2-X-benzyl)-1,4,7-triazacyclononane, wherein X&equals;&mdash;O&mdash;, &mdash;COO&mdash;, R &equals;CH , C H , C H , i-C H , t-C H , OCH , OC H , OC H , O C H , F, Cl, Br, NO and R &equals;CH , C H , C H , i-C H , t-C H , OCH , OC H , OC H , O C H , F, Cl, Br, NO .

Organic light-emitting diode with terbium complex

As a white light source, the lighting system (,) has at least three light-emitting diodes (,) for providing visible light at preselected wavelengths. The invention is characterized in that the lighting system (,) is provided with at least one fourth light-emitting diode (,) which, in operation, emits visible light in a further wavelength region, the maximum of the spectral emission of the fourth light-emitting diode (,) lying in the further wavelength region from 575 to 605 nm. Preferably, the further wavelength region ranges from 585 to 600 nm. Preferably, the color rendition of the lighting system (,) is above 60. Preferably, the luminous efficacy of the lighting system (,) is above 30 lm/W, preferably above 40 lm/W. In another preferred embodiment, the color temperature of the lighting system (,) can be adjusted by selectively switching the light-emitting diodes (,).

LED lighting system for producing white light

A lighting system includes at least two light-emitting diodes each emitting, in operation, visible light in a preselected wavelength range. A converter converts part of the visible light emitted by one of the diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system. The diodes include a blue light-emitting diode and a red light-emitting diode. Further, the converter includes a luminescent material for converting a portion of the light emitted by the blue light-emitting diode into green light.

Growing community of inventors

Aachen, Germany

Thomas Jüstel

Growing community of inventors

Aachen, Germany

Thomas J&uuml;stel

Thomas Jüstel