Lumileds LLC

Koninklijke Philips Corporation N.V.

Philips Lighting Holding B.v.

Lumileds Holding B.v.

Patrick John Baesjou

Marcel Rene Bohmer

Roelof Koole

Mark Thomas Johnson

Lucas Josef Maria Schlangen

Johannes Franciscus Maria Cillessen

Wilhelmus Cornelis Keur

Rifat Ata Mustafa Hikmet

Johan Lub

Peter Alexander Duine

Alwin Rogier Martijn Verschueren

Frank Verbakel

Cornelis Eustatius Timmering

Kamal Asadi

Eduard Matheus Johannes Niessen

Stefan Willi Julius Gruhlke

Dirk Jan Broer

Martinus Hermanus Wilhelmus Maria Van Delden

Paulus Cornelis Duineveld

Dagobert Michel De Leeuw

Franciscus Paulus Maria Budzelaar

Guofu Zhou

Sander Jurgen Roosendaal

Manuela Lunz

Godefridus Johannes Verhoeckx

Emile Johannes Karel Verstegen

Jan Cornelis Kriege

Dirk Veldman

Volker Schoellmann

Antonius Wilhelmus Maria De Laat

Paulus Hubertus Gerardus Offermans

Marcellinus Petrus Carolus Krijn

Gerardus Henricus Rietjens

Dagobert Michael De Leeuw

Joep Lodewijk Peters

The invention provides a luminescent material comprising wavelength converter nanoparticles () with siloxane polymer capping ligands () associated to the wavelength converter nanoparticles (), wherein the siloxane polymer capping ligands () comprise siloxane polymers which comprise at least one capping group comprising a terminal carboxylic acid group, wherein the capping group comprises in total at least six carbon atoms.

Siloxane ligands to be used for dispersing quantum dots in silicone hosts to obtain color converters for LED lighting

The invention provides a method for the production of a luminescent material, () based on coated quantum dots (), comprising: (i) providing luminescent quantum dots () in a liquid medium () wherein the luminescent quantum dots () have an outer layer () comprising first cations and first anions; and (ii) providing in a coating process a coating () on the outer layer () of the quantum dots () in the liquid medium (), wherein the coating () comprises a silica coating; wherein during the coating process, or after the coating process, or during and after the coating process, the liquid medium () comprises one or more of a third element and a fourth element, wherein the first cation and the third element belong to the same group of the periodic system, and wherein the first anion and the fourth element belong to the same group of the periodic system.

Silica coated quantum dots with improved quantum efficiency

The invention provides a luminescent material () based on quantum dots (), wherein the quantum dots () have inorganic capping agents (), wherein the luminescent material () comprises particles () having an inorganic salt matrix () hosting the quantum dots () with inorganic capping agents (), wherein the luminescent quantum dots () have an outer layer (). The invention also provides a method for the production of such luminescent material (). The new luminescent material can be used and processed as conventional particulate luminescent material.

Quantum dots with inorganic ligands in an inorganic matrix

The invention provides a process for the production of a wavelength converter containing a siloxane polymer matrix with wavelength converter nano particles embedded therein, the process containing (a) mixing (i) a first liquid containing (i1) short chain siloxane polymers and (i2) wavelength converter nano particles having an outer surface grafted with siloxane grafting ligands and (ii) curable siloxane polymers, and (b) curing the curable siloxane polymers, thereby producing the wavelength converter (); wherein the short chain siloxane polymers have s1 Si backbone elements, wherein the siloxane grafting ligands comprise siloxane grafting ligands having x1 Si backbone elements, wherein at least one Si backbone element of each siloxane grafting ligand comprises a group having a grafting functionality; and wherein the curable siloxane polymers have y1 Si backbone elements, wherein x1/s1&#x2265;0.8, s1&#x3c;y1 and wherein x1&#x3c;y1.

PDMS-based ligands for quantum dots in silicones

The invention provides a luminescent material () comprising quantum dots (), wherein the luminescent material () further comprises a capping agent () coordinating to the quantum dots (), wherein the capping agent comprises MO(OH), wherein M is selected from the group consisting of B, Al, P, S, V, Zn, Ga, Ge, As, Se, Nb, Mo, Cd, In, Sn, Sb, Te, Ta and W, wherein x&#x2265;1, y+z&#x2265;1, and wherein n indicates a positive or negative charge of the capping agent.

Oxo- and hydroxo-based composite inorganic ligands for quantum dots

The invention provides a lighting device comprising (a) a light converter comprising a light receiving face; and (b) a solid state light source configured to generate a light source light with a photon flux of at least 10 W/cmat the light receiving face, wherein the light converter is configured to convert at least part of the light source light into light converter light having a first frequency, wherein the light converter comprises a semiconductor quantum dot in an optical structure selected from a photonic crystal structure and a plasmonic structure, wherein the optical structure is configured to increase the photon density of states in the light converter resonant with the first frequency for reducing saturation quenching, and wherein the quantum dot has a quantum efficiency of at least 80%.

Quantum dots with reduced saturation quenching

The invention provides a process for the production of a light converter comprising a siloxane polymer matrix with light converter nano particles embedded therein, the process comprising (a) mixing (i) light converter nano particles having an outer surface grafted with grafting ligands and (ii) curable siloxane polymers, and (b) curing the curable siloxane polymers, thereby producing the light converter; wherein the grafting ligands comprise siloxane grafting ligands having x1 Si backbone elements, wherein at least one Si backbone element of each siloxane grafting ligand comprises a side group having a grafting functionality; wherein the curable siloxane polymers have y1 Si backbone elements; and wherein x1 is at least 20, wherein y1 is at least 2, and wherein x1/y1&#x2265;0.8.

The invention provides a process for the production of a (particulate) luminescent material comprising particles, especially substantially spherical particles, having a porous inorganic material core with pores, especially macro pores, which are at least partly filled with a polymeric material with luminescent quantum dots embedded therein, wherein the process comprises (i) impregnating the particles of a particulate porous inorganic material with pores with a first liquid ('ink') comprising the luminescent quantum dots and a curable or polymerizable precursor of the polymeric material, to provide pores that are at least partly filled with said luminescent quantum dots and curable or polymerizable precursor; and (ii) curing or polymerizing the curable or polymerizable precursor within pores of the porous material, as well as a product obtainable thereby.

Encapsulated quantum dots in porous particles

Method for producing a light emitting semiconductor device comprising a zinc magnesium oxide based layer as active layer, wherein the zinc magnesium oxide based layer comprises an aluminum doped zinc magnesium oxide layer having the nominal composition ZnMgO with 1-350 ppm Al, wherein x is in the range of 0&#x3c;x&#x2266;0.3. The invention further provides a method for the production of such aluminum doped zinc magnesium oxide, the method comprising heat treating a composition comprising Zn, Mg and Al with a predetermined composition at elevated temperatures, and subsequently annealing the heat treated composition to provide said aluminum doped zinc magnesium oxide.

Method for producing light emitting semiconductor device

The present invention relates to a drive method for an electrophoretic cell and a device adapted to implement the method. The cell comprises a first storage electrode (), a second storage electrode (), a first target area electrode (), a second target area electrode (), a first type of particle () and a second type of particles (), said second type of particles being of opposite polarity to the first type of particles. An area () extending between the target area electrodes () is a target area. The method comprises a reset phase (), wherein said first and second type of particle are reset to determined reset positions, a first write phase (), wherein the first type of particles are moved to and/or from the storage electrodes and change in amount in said target area (), a second write phase () similar to the first write phase but for the second type of particles, and a spread phase () so that the particles in said target area () distribute and mix. The method allows for short distance movements and two particle type in the same cell can be written comparatively fast.

Drive method for an electrophoretic cell and an electrophoretic device

The invention provides a light emitting semi conductor device comprising a zinc magnesium oxide based layer as active layer, wherein the zinc magnesium oxide based layer comprises an aluminum doped zinc magnesium oxide layer having the nominal composition Zn-xMgxO with 1-350 ppm Al, wherein x is in the range of 0&#x3c;x&#x2266;0.3. The invention further provides a method for the production of such aluminum doped zinc magnesium oxide, the method comprising heat treating a composition comprising Zn, Mg and Al with a predetermined composition at elevated temperatures, and subsequently annealing the heat treated composition to provide said aluminum doped zinc magnesium oxide.

II-VI based light emitting semiconductor device

An electrophoretic dispersion with at least two particle species is proposed in which a minimal number (and concentration) of free compounds is present in solution. All chemicals needed to color and stabilize the pigment particles are preferably covalently attached to or within the particles. This enhances the robustness of the system and minimizes the conductivity of the dispersion so that the driving voltage for an electrophoretic display is reduced.

Robust multi particle system for color electrophoretic displays with very low driving voltages comprising a low amount of electrolytes

The electrophoretic display panel() for displaying a picture and subsequently displaying a subsequent picture has a pixel() having an electrophoretic medium () having first and second charged particles () and an optical state depending on the positions of the particles () in the common region () of the pixel (). Furthermore, transition control means are able to control a transition of the first and the second particles () being in substantially separated domains of the common region () for displaying the picture to substantially separated domains of the common region () for displaying the subsequent picture. For the display panel () to be able to have an attainable optical state for displaying the subsequent picture which is unequal to the optical state determined by the mixture of the first and second particles (), even if the particles () have substantially equal electrophoretic mobilities, the transition control means are further able to control the first and the second particles () to be in substantially separated domains of the common region () during the transition.

Electrophoretic display panel

The light modulator for modulating light has a light modulating element, having a medium with a particle () and an optical state depending on the position of the particle (), and a particle controller () being arranged to enable a movement of the particle () to one of the positions for modulating the light. For the light modulator to have a particle () which can relatively easily be moved, the particle () has a carrier particle () which contributes in operation to the ability of the particle () to be moved and is substantially non-contributing to the optical state, and an optical particle () which has an optical property for contributing to the optical state, is associated with the carrier particle (), and has a position depending on the position of the carrier particle ().

Light modulator

The present invention provides a novel design for color electrophoretic displays. In the display, each pixel () comprises at least two sub-pixels (), and each sub pixel is fitted with a color filter () and contains an electrophoretic media comprising two particle types (). The color filters () in the sub-pixels of each pixel have essentially non-overlapping absorption bands, and together cover essentially all of the wavelengths over which the display is operative. Furthermore, the absorption bands of the particles in each sub-pixel () each cover a portion of the wavelengths that is not covered by the filter () in the respective sub-pixel. The wavelength bands typically correspond to different colors. Thereby each wavelength band, or color, can be emitted by more than one sub-pixel in each pixel, resulting in increased brightness. According to one particular embodiment, each pixel comprises three sub-pixels having a cyan, magenta, and yellow absorbing filter, respectively.

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Eindhoven, Netherlands

Patrick John Baesjou