Lumileds LLC

Other

Koninklijke Philips Corporation N.v.

Andreas Tücks

Peter Josef Schmidt

Volker Weiler

Jens Meyer

Erik Maria Roeling

Philipp-Jean Strobel

Bernd Ackermann

Peter Lürkens

Jorg Meyer

Baby Seriyati Schreinemacher

This specification discloses methods of enhancing the stability and performance of Eudoped narrow band red emitting phosphors. In one embodiment the resulting phosphor compositions are characterized by crystallizing in ordered structure variants of the UCrCcrystal structure type and having a composition of AELiAlSiON:Eu(AE=Ca, Sr, Ba, or a combination thereof, 0<x<0.04, 0≤y<1, 0<z<0.05, y+z≤1). It is believed that the formal substitution (Al,O)by (Si,N)reduces the concentration of unwanted Euand thus enhances properties of the phosphor such as stability and conversion efficiency.

Narrow band emitting SiAION phosphor

The invention provides a method for providing a luminescent particle with a hybrid coating, the method comprising: (i) providing a luminescent core comprising a primer layer on the luminescent core; (ii) providing a main ALD coating layer onto the primer layer by application of a main atomic layer deposition process, the main ALD coating layer comprising a multilayer with two or more layers having different chemical compositions, and wherein in the main atomic layer deposition process a metal oxide precursor is selected from a group of metal oxide precursors comprising Al, Zn, Hf, Ta, Zr, Ti, Sn, Nb, Y, Ga, and V; (iii) providing a main sol-gel coating layer onto the main ALD-coating layer by application of a main sol-gel coating process, the main sol-gel coating layer having a chemical composition different from one or more of the layers of the multilayer.

Phosphor particle coating

The invention provides a method for providing a luminescent particle () with a hybrid coating, the method comprising: (i) providing a luminescent core () comprising a primer layer () on the luminescent core (); (ii) providing a main ALD coating layer () onto the primer layer () by application of a main atomic layer deposition process, the main ALD coating layer () comprising a multilayer () with two or more layers () having different chemical compositions, and wherein in the main atomic layer deposition process a metal oxide precursor is selected from a group of metal oxide precursors comprising Al, Zn, Hf, Ta, Zr, Ti, Sn, Nb, Y, Ga, and V; (iii) providing a main sol-gel coating layer () onto the main ALD-coating layer () by application of a main sol-gel coating process, the main sol-gel coating layer () having a chemical composition different from one or more of the layers () of the multilayer ().

This specification discloses a method of enhancing the stability and performance of Eudoped narrow band red emitting phosphors. The resulting phosphor compositions are characterized by crystallizing in ordered structure variants of the UCrCcrystal structure type and having a composition of AELiAlSiON:EU(AE=Ca, Sr, Ba; 0&#x3c;x&#x3c;0.04, 0&#x2264;y&#x3c;1, 0&#x3c;z&#x3c;0.05, y+z&#x2264;1). It is believed that the formal substitution (Al,O)by (Si,N)reduces the concentration of unwanted Euand thus enhances properties of the phosphor such as stability and conversion efficiency.

Narrow band emitting SiAlON phosphor

The invention provides a method for providing luminescent particles () with a hybrid coating, the method comprising (i) providing a first coating layer () onto the luminescent particles () by application of a sol-gel coating process, thereby providing coated luminescent particles; and (ii) providing a second coating layer () onto the coated luminescent particles by application of an atomic layer deposition process. The invention also provides luminescent particles () comprise a luminescent core (), a first coating layer () having a first coating layer thickness (d) in the range of 50-300 nm, and a second coating layer () having a second coating layer thickness (d) in the range of 5-250 nm.

Phosphor with hybrid coating and method of production

A lighting device for generating colored and white light. According to the invention the lighting device comprises at least one light source () emitting blue or ultraviolet light and a color conversion unit () for converting said blue or ultraviolet light into visible light comprising at least two sections (), at least one section () of which being a transparent or translucent color converting section, said color conversion unit () being arranged for alternately illuminating said at least two sections () with said blue or ultraviolet light, said at least one color converting section containing luminescent material, wherein said luminescent material is a luminescent organic dye in a polymer matrix or a crystalline inorganic luminescent material.

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Aachen, Germany

Andreas Tücks