Abstract: The invention provides a method for providing luminescent particles (100) with a hybrid coating, the method comprising (i) providing a first coating layer (110) onto the luminescent particles (100) by application of a sol-gel coating process, thereby providing coated luminescent particles; and (ii) providing a second coating layer (120) onto the coated luminescent particles by application of an atomic layer deposition process. The invention also provides luminescent particles (100) comprise a luminescent core (102), a first coating layer (110) having a first coating layer thickness (d1) in the range of 50-300 nm, and a second coating layer (120) having a second coating layer thickness (d2) in the range of 5-250 nm.

Abstract: The invention relates to a light emitting device comprising a light source, especially a LED, and a luminescent material, which is a ceramic multiphase material essentially of the composition M2?zCezSi5?x?y?(z?z1)Ay+(z?z1)N8?4x?y+z1O4x+y?z1. This material has been found to have a composition of at least two phases, which leads to a better producibility as well as photostability and conversion efficiency.

Abstract: The invention relates to an improved green emitting material of the form MI3-x-yMIIx Si6-xAlxO12N2:Euy, whereby MI is an earth alkali metal and MII is a rare earth metal or Lanthanum. This material can be made as a ceramic using a low temperature sintering step, resulting in a better and more uniform ceramic body.

Abstract: The invention relates to a ceramic luminescent material for LEDs with reduced scattering made by a uniaxial hot-pressing step.

Abstract: The invention relates to a light emitting device, especially a LED with a ceramic composite material essentially of the composition M1?yA2?xBxO2?2xN2+X:Euy, where M is selected out of the group comprising Sr, Ca, Ba, Mg or mixtures thereof, A is selected out of the group comprising Si, Ge or mixtures thereof, B is selected out of the group comprising Al, B, Ga or mixtures thereof and x and y are independently selected from >0 to ?1. This material has been found to be a two-phase composition, one phase being an amber to red emitting phase, the other one being a cyan to green emitting phase.

Abstract: The invention relates to a light emitting device comprising a light source, especially a LED, and a luminescent material, which is a ceramic multiphase material essentially of the composition M2?zCezSi5?x?y?(z?z1)Ay+(z?z1)N9?4x?y+z1O4x+y?z1.

Abstract: An illumination system comprising a radiation source and a composite monolithic ceramic luminescence converter comprising a composite luminescent material comprising at least one first phosphor and at least one second phosphor capable of absorbing a part of the light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light provides improved light mixing and chromaticity control of the emitted light mixture. The invention relates also to a composite monolithic ceramic luminescence converter and a method of manufacturing such composite monolithic ceramic luminescence converter.