The invention provides a light generating system (1000), comprising a plurality of light sources (10), an elongated luminescent body (100), and a body holder structure (2000), wherein: —the plurality of light sources (10) are configured to provide light source light (11), wherein the light sources (10) are solid state light sources, wherein the plurality of light sources (10) are configured in a light source array (15); —the elongated luminescent body (100) has a length (L) and a width (W), wherein the elongated luminescent body (100) comprises luminescent material (120) configured to convert at least part of light source light (11) into luminescent material light (8), wherein the elongated luminescent body (100) and the light source array (15) are configured parallel; —the body holder structure (2000) comprises an elongated slit (205) for hosting the elongated luminescent body (100), wherein the elongated slit (205) has a cavity wall (1205) defining the elongated slit (205) and a slit opening (1206), wherein the slit opening (1206) has a slit opening width (WS1), wherein the cavity wall (1205) and the elongated luminescent body (100) have first shortest distances (d11) that vary over the cavity wall (1205), wherein at least part of the cavity wall (1205) is reflective for light source light (11); —the light sources (10) are configured at second shortest distances (d21) from the elongated luminescent body (100), wherein the second shortest distance (d21) is selected from the range of 40-1000 μm, and wherein one or more of the plurality of light sources (10) are configured to irradiate with the light source light (11) the elongated luminescent body (100) both (i) directly and (ii) indirectly via the cavity wall (1205).

The invention provides an elongated luminescent body (100) comprising an elongated support (170) and a coating layer (180), wherein the elongated luminescent body (100) further comprises a body axis (BA), and a length parameter P of a body dimension perpendicular to the body axis (BA), wherein the length parameter P is selected from height (H), width (W) and diameter (D), wherein: —the elongated support (170) comprises a support material (171), a support material index of refraction n1, wherein the support material index of refraction n1 is at least 1.4, a support surface (172), and a support length (L1); —the coating layer (180) is configured on at least part of the support surface (172) over at least part of the support length (L1), wherein the coating layer (180) comprises a coating layer material (181), a coating layer index of refraction n2, wherein coating layer index of refraction n2 is at least 1.4, and a coating layer thickness (d1), wherein the coating layer material (181) has a composition different from the support material (171), wherein the coating layer material (181) comprises a luminescent material (120) configured to absorb one or more of UV radiation and visible light, and to convert into luminescent material light (8) having one or more wavelengths in one or more of the visible and the infrared; and —the support material (171) is transmissive for the luminescent material light (8), and (i) −0.2≤n1−n2≤0.2 and (ii) d1/P≤0.25 apply.

A light-emitting system includes an optical fiber, a first light source unit, a second light source unit, and a light-guiding member. The optical fiber includes a wavelength-converting portion containing a wavelength-converting element. The wavelength-converting element may be excited by excitation light to produce a spontaneous emission of light having a longer wavelength than the excitation light and may also be excited by an amplified spontaneous emission of light. The first light source unit makes the excitation light incident on the optical fiber. The second light source unit makes seed light, causing the wavelength-converting element that has been excited by either the excitation light or the amplified spontaneous emission of light to produce a stimulated emission of light, incident on the optical fiber. The light-guiding member guides the light coming from the optical fiber and lets the light emerge therefrom.

An illuminated container for the growth of biological entities is provided. The container is illuminated by a flexible light diffusing fiber. The light diffusing fiber includes a core formed from a silica-based glass and a cladding in direct contact with the core. The light diffusing fiber also includes an outer polymer coating layer surrounding the cladding, the outer polymer coating layer being the cured product of a liquid polymer blend including a scattering material and a luminophore.

In an embodiment, a radiation emitting device comprises a radiation emitting layer comprising a host material and a luminescent agent; and a radiation source that emits a source radiation; wherein the radiation emitting layer comprises an edge and two broad surfaces, wherein the edge has a height of d and the broad surfaces have a length L, wherein length L is greater than height d, and the ratio of L to d is greater than or equal to 10; and wherein the radiation source is coupled to the edge, wherein the source radiation is transmitted from the radiation source through the edge and excites the luminescent agent, whereafter the luminescent agent emits an emitted radiation, wherein at least a portion of the emitted radiation exits through at least one of the broad surfaces through an escape cone.

A wide-area solid-state illumination system employing a waveguide with two-sided segmented light emission and one or more compact solid-state light sources, such as LEDs, coupled to an edge of the waveguide. The waveguide is made of a thin sheet of optically transmissive material with a uniform thickness and has a plurality of light extraction areas distributed over the waveguide's area according to a two-dimensional pattern. The light extraction areas are separated from one another by separation areas and have different densities of light extraction surface structures. The surface structures are configured to distribute light from both sides of the waveguide. At least some of the light extraction surface structures are formed by discrete surface microstructures spaced apart from one another by distances which are greater than sizes of the individual discrete surface microstructures and at least five times less than a width of the separation areas.

A kit for illuminating the hair of a user, comprises: at least one light emitting diode emitting light at a wavelength, an optical fiber (26) coupled to the or each light emitting diode, a fastening element (22) to fasten the or each light emitting diode and/or the optical fiber to the hair of a user,

The kit comprises a fluorescent material (30), the optical fiber (26) being configured to transmit the light emitted by the or each light emitting diode to the fluorescent material (30), the fluorescent material (30) being excited at the wavelength of the or each light emitting diode.

An electronic device with a e-paper display that internally integrates photovoltaic cells and are not apparent from the exterior of the device. A light source of the device injects light into a light guide to front-light the e-paper. Light that leaks from edges of the light guide is captured by the photovoltaic cells. The plastic light guide is also impregnated with a photoluminescent material that absorbs near infrared energy that is incident on a face of the display and re-emits it isotropically to be guided by the light guide to the photovoltaic cells. By combining multiple techniques to illuminate hidden photovoltaic cells, the utility of the hidden cells is maximized.

A display device includes a light source unit which provides light, a light guide plate which includes a plurality of faces, a plurality of optical patterns configured to convert a wavelength of incident light received from the light source unit, and disposed on at least one face of the plurality of faces, and a display panel which is disposed on the light guide plate and configured to display an image by receiving light emitted from the light guide plate, wherein each optical pattern of the plurality of optical patterns includes an optical resin including an organic phosphor which converts the wavelength of the incident light, and a base material.

The invention provides a lighting device (100) configured to provide lighting device light (101). The lighting device (100) comprises a plurality of light sources (200) configured to provide light source light (201), the plurality of light sources (200) comprising at least a first light source (210) configured to generate first light source light (211) and a second light source (220) configured to generate second light source light (221). The lighting device further comprises a light guide (300) comprising: a luminescent material (310) excitable by the light source light (201), and configured to provide luminescent material light (311), wherein the luminescent material (310) is configured to reabsorb at least part of its luminescent material light (311), a light exit window (330) for escape of the luminescent material light (311) from the light guide (300), and a plurality of light incoupling areas (320) arranged perpendicular to the light exit window (330) and comprising at least a first light incoupling area (321) configured at a first distance (d1) from the light exit window (330), and a second light incoupling area (322) configured at a second distance (d2) from the light exit window (330). The first light source (210) is configured to provide said first light source light (211) to the first light incoupling area (321), wherein the second light source (220) is configured to provide said second light source light (221) to the second light incoupling area (322), wherein the first distance (d1) is unequal to the second distance (d2). The lighting device further comprises a control unit (500) arranged for controlling the color temperature of the lighting device light by independently controlling the plurality (m) of light sources (200) dependent on the distance of each light source from the light exit window (330).