Abstract: According to an aspect of the present invention, a lighting device (2) is provided. The lighting device (2) comprises a wavelength converting layer (21) having a curved shape and a light source (22) arranged to emit light towards the wavelength converting layer (21). The wavelength converting layer (21) intersects a plane extending through the light source (22) and being parallel with the optical axis of the light source (22), at a curve given, in a polar coordinate system centered at the light source (22), by the equation: R(?)=k·I(?)1/2±D, wherein k is a constant, 0 is an angle with respect to said optical axis, /(?) is a function defining a luminous intensity profile of the light source and D is a deviation ranging from zero to 20% of the maximum value of said curve, Rmax. The present invention is advantageous in that the lighting device (2) has a more uniform color distribution of emitted light across the wavelength converting layer (21) and the risk of color gradients and artifacts is reduced.

Abstract: According to an aspect of the present invention, a lighting device (2) is provided. The lighting device (2) comprises a wavelength converting layer (21) having a curved shape and a light source (22) arranged to emit light towards the wavelength converting layer (21). The wavelength converting layer (21) intersects a plane extending through the light source (22) and being parallel with the optical axis of the light source (22), at a curve given, in a polar coordinate system centered at the light source (22), by the equation: R(?)=k·I(?)1/2±D, wherein k is a constant, 0 is an angle with respect to said optical axis, /(?) is a function defining a luminous intensity profile of the light source and D is a deviation ranging from zero to 20% of the maximum value of said curve, Rmax. The present invention is advantageous in that the lighting device (2) has a more uniform color distribution of emitted light across the wavelength converting layer (21) and the risk of color gradients and artifacts is reduced.

Abstract: The invention provides a luminescent optical device (10) having an optical waveguide (200). The luminescent optical device (10) further has a photo-luminescent structure (100) on or inside the optical waveguide (200). The photo-luminescent structure (100) comprises a plurality of photo-luminescent domains (110) containing photo-luminescent material (120). The photo-luminescent material (120) is capable of emitting emission light upon excitation by excitation light. The photo-luminescent domains (110) are arranged to emit, upon excitation by excitation light, at least part of the emission light into the optical waveguide layer (200). The luminescent optical device (10) further may comprise a lens structure (300) on the optical waveguide (200).

Abstract: The invention provides a luminescent optical device (10) having an optical waveguide (200). The luminescent optical device (10) further has a photo-luminescent structure (100) on or inside the optical waveguide (200). The photo-luminescent structure (100) comprises a plurality of photo-luminescent domains (110) containing photo-luminescent material (120). The photo-luminescent material (120) is capable of emitting emission light upon excitation by excitation light. The photo-luminescent domains (110) are arranged to emit, upon excitation by excitation light, at least part of the emission light into the optical waveguide layer (200). The luminescent optical device (10) further may comprise a lens structure (300) on the optical waveguide (200).

Abstract: The present disclosure relates to method of forming organosiloxane nanofibers on substrates, in particular by contacting an activated substrate with a vapor comprising vinyltrichlorosilane. The disclosure relates to the substrates thus formed and to various uses thereof. The disclosure further relates to a general method of preparing hydrophilic siloxane nanofibers on a substrate comprising by annealing any substrate coated with organosiloxane nanofibers under conditions to remove substantially all of the organic portions of the organosiloxane nanofibers.