Koninklijke Philips Corporation N.v.

Lumileds LLC

Loes Johanna Mathilda Koopmans

Rifat Ata Mustafa Hikmet

Marcel Rene Bohmer

Kentaro Shimizu

Roelof Koole

Hendrik Johannes Boudewijn Jagt

Dominique Maria Bruls

Durandus Kornelius Dijken

Manuela Lunz

Cornelis Eustatius Timmering

Martin Hillebrand Blees

Dirk Veldman

The invention provides a lighting device for providing light, the lighting device comprising a closed chamber with a light transmissive window and a light source configured to provide light source radiation into the chamber, wherein the chamber further encloses a wavelength converter configured to convert at least part of the light source radiation into wavelength converter light, wherein the light transmissive window is transmissive for the wavelength converter light, wherein the wavelength converter comprises luminescent quantum dots which upon excitation with at least part of the light source radiation generate at least part of the wavelength converter light, and wherein the closed chamber comprises a filling gas comprising one or more of helium gas, hydrogen gas, nitrogen gas or oxygen gas, the filling gas having a relative humidity at 19&#xb0; C. of at least 5%.

Quantum dots in enclosed environment

A wavelength converting member is provided, comprising a sealed capsule at least partly made of sintered polycrystalline ceramic, for example sintered polycrystalline alumina, said capsule defining at least one sealed cavity; and&#x2014;a wavelength converting material contained within said sealed cavity. The wavelength converting member has high total forward transmission of light, high thermal conductivity, high strength and provides excellent protection for the wavelength converting member against oxygen and water. The wavelength converting member can advantageously be applied in a light emitting arrangement or as a color wheel for a digital image projector.

Wavelength converting element comprising ceramic capsule

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Eindhoven, Netherlands

Loes Johanna Mathilda Koopmans