A luminaire that includes a light emitting diode (LED) array configured to produce light in a first direction along a propagation path. An optical waveguide is spaced apart from the LED array by a gap and with the optical waveguide and the gap disposed along the propagation path. The optical waveguide is configured to receive the light along the propagation path at the first waveguide surface and transmit the light away from the luminaire at the second waveguide surface. A housing is mounted to the LED array and the optical waveguide and includes a slot directly adjacent to the gap.

A light diffusing optical fiber includes a glass core, a cladding, a phosphor layer surrounding the cladding, and a plurality of scattering structures positioned within the glass core, the cladding, or both. The phosphor layer includes two or more phosphors and is configured to convert guided light diffusing through the phosphor layer into emission light such that the color of the emission light has a chromaticity within a u-v chromaticity region on a CIE 1976 chromaticity space defined by: a first u-v boundary line and a second u-v boundary line that extend parallel to a planckian locus at a distance of 0.02 Duv from the planckian locus, a third u-v boundary line that extends along an isothermal line for a correlated color temperature of about 2000 K, and a fourth u-v boundary line that extends along an isothermal line for a correlated color temperature of about 10000 K.

A solid body made of an inactive, light transmissive material (3) has embedded therein an optical fiber (6) having a lengthwise segment (9) in which a scattering structure is formed that is to redirect primary propagating light sideways out of the fiber (6). An active photoluminescent layer integrated in the optical fiber (6) is to wavelength-convert the primary light into secondary light. The solid body is generally cylindrical but without rotational symmetry about the center longitudinal axis (2) of the fiber (6). A portion of the outer side surface of the body is curved and is covered by an external reflector (4), while another portion of the outer side surface is uncovered by the reflector in order for the secondary light to emerge. Other embodiments are also described and claimed.

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.

An improved waveguide is disclosed. The waveguide utilizes a luminescent material disposed within or around its perimeter to introduce additional light into the waveguide. For example, the waveguide may include a plurality of planar layers having different refractive indexes. A luminescent material may be disposed along the outer edge of these layers. When light from within the waveguide strikes the luminescent material, it emits light, thereby adding to the light in the waveguide. Not only does the luminescent material introduce more light into the waveguide, it also introduces more light sources, thereby making it more difficult to introduce a probe without blocking at least a portion of the light destined for the image sensor. The luminescent material may be a phosphor.

The invention provides a lighting system (1) comprising: a light source (10) configured to provide light source light (11); an elongated luminescent body (100) having a length (L), the elongated luminescent body (100) comprising: a plurality of side faces (140) over at least part of the length (L), wherein the side faces (140) comprise a first side face (143), comprising a radiation input face (111), and a second side face (144) configured parallel to the first side face (143), wherein the side faces (143, 144) define a height (H), wherein the elongated luminescent body (100) further comprises a radiation exit window (112) bridging at least part of the height (H) between the first side face (143) and the second side face (144); a garnet type A.sub.3B.sub.5O.sub.12 luminescent material (120) comprising trivalent cerium, with a height dependent concentration selected from a concentration range defined by a minimum concentration y.sub.min=0.036*x.sup.1 and a maximum concentration y.sub.max=0.17*x.sup.1, wherein y is the trivalent cerium concentration in % relative to the A element, and wherein h is the height (H) in mm, wherein the garnet type A.sub.3B.sub.5O.sub.12 luminescent material (120) is configured to convert at least part of the light source light (11) into converter light (101); one or more heat transfer elements (200) in thermal contact with one or more side faces (140); anda reflector (2100) configured at the second side face (144) and configured to reflect light source light (11) escaping from the elongated luminescent body (100) via second face (144) back into the elongated luminescent body (100).

The present disclosure provides a display module and a display device including the same. The display module includes a backplate, an optical film, a quantum dot film, a phosphor layer, and a light source. The optical film is disposed on the backplate. The optical film has a light incident surface, a light emitting surface, and a first side surface. The first side surface is perpendicular to the backplate, and the light emitting surface is parallel to the backplate. The quantum dot film is disposed on the light emitting surface of the optical film. The phosphor layer is disposed on the first side surface of the optical film. The light incident surface of the optical film is located on the backplate in a light emission direction of the light source.

A display device includes a display panel, and a backlight unit which provides first light to the display panel, the first light being a combination of light having a first peak wavelength and light having a second peak wavelength. The display panel includes a wavelength conversion layer which converts a peak wavelength of the first light. The backlight unit includes laser diodes emitting the light having the second peak wavelength, and where the wavelength conversion layer includes quantum dots or phosphor.

A phosphor element comprises: a support substrate; an optical waveguide for propagating an excitation light through the waveguide, the optical waveguide comprising a phosphor generating a fluorescence, and the optical waveguide comprising an emission side end surface emitting the excitation light and the fluorescence, an opposing end surface opposing the emission side end surface, a bottom surface, a top surface opposing the bottom surface and a pair of side surfaces; a bottom surface side clad layer covering the bottom surface of the optical waveguide; a top surface side clad layer covering the top surface of the optical waveguide; side surface side clad layers covering the side surfaces of the optical waveguide, respectively; a top surface side reflection film covering the top surface side clad layer; side surface side reflection films covering the side surface side clad layers, respectively; and a bottom surface side reflection film provided between the support substrate and the bottom surface side clad layer.

A white light generating device, for generating white light from an excitation light of a laser light having a wavelength of 280 nm or longer and 495 nm or shorter, includes a fluorescent body generating a fluorescence having a wavelength longer than a wavelength of the excitation light. The fluorescent body includes an emission-side end surface emitting excitation light and fluorescence, an opposing end surface on an opposite side of the emission-side end surface, and an outer peripheral surface. The emission-side end surface has an area larger than an area of the opposing end surface, and the outer peripheral surface of the fluorescent body includes a part inclined with respect to a central axis of the fluorescent body by 3.4 or larger and 23 or smaller over an entire periphery of the fluorescent body. The emission-side end surface has an area of 0.3=.sup.2 or larger and 1.52=.sup.2 or smaller.