Abstract:
A camera flash comprises a solid-state light source (laser chip) operable to emit excitation light having an emission peak wavelength in a first wavelength range and a photoluminescence wavelength conversion component located remote to the light source. The photoluminescence wavelength conversion component comprises at least one photoluminescence material (phosphor) that is excitable by the excitation light and in response emits light having an emission peak wavelength in a second wavelength range. The light source is configured such that excitation light is incident on an area of the photoluminescence wavelength conversion component less than about 0.01 mm2. The photoluminescence wavelength conversion component can comprise a light reflective or light transmissive component.
Abstract:
A lighting system comprises at least one excitation source (5), preferably an LED, operable to generate and radiate excitation radiation of a first wavelength (λ1); a shade (4) configured to at least in part surround the at least one source (5) and remotely located thereto; and at least one phosphor (16) provided in or on at least a part of the shade (4), wherein the phosphor (16) emits radiation of a different wavelength in response to incident excitation radiation. The phosphor can be provided on a part of an outer or inner surface of the shade. Alternatively, or in addition, the phosphor is incorporated within the shade. The lighting system finds particular application as a hanging, a desk, a floor standing, a wall mountable, a spot, an outdoor or an accent lighting fixture.
Abstract:
A photoluminescence sheet comprises a polymer sheet having particles of at least one photoluminescence material homogeneously distributed throughout its volume. The polymer sheet comprises a UV-curable polymer that is partially cured and which is thermally re-flowable before being fully cured by exposure to UV light.
Abstract:
A red-emitting phosphor comprises a nitride-based composition represented by the chemical formula M(x/v)M′2Si5-xAlxN8:RE, wherein: M is at least one monovalent, divalent or trivalent metal with valence v; M′ is at least one of Mg, Ca, Sr, Ba, and Zn; and RE is at least one of Eu, Ce, Tb, Pr, and Mn; wherein x satisfies 0.1≦x
Abstract:
A solid-state linear lamp comprises a co-extruded component, the co-extruded component comprising multiple photoluminescence portions corresponding to different color temperatures, a diffuser portion, and a top portion, where the photoluminescence portion, the diffuser portion, and the top portion are integrally formed into the co-extruded component.
Abstract:
Yellow-green to yellow-emitting, lutetium aluminate-based terbium (Tb) containing phosphors for use in white LEDs, general lighting, and LED and backlighting displays are disclosed herein. The phosphor may further contain gadolinium (Gd). In one embodiment of the present invention, the phosphor comprises a cerium-activated, yellow-green to yellow-emitting lutetium aluminate-based phosphor having the formula (Lu1-xAx)3Al5O12:Ce wherein A is at least one of Gd and Tb and 0.1≦x≦1.0, wherein the phosphor is configured to emit light having a peak emission wavelength ranging from about 550 nm to about 565 nm, and wherein the phosphor contains at least some Tb.
Abstract:
A photoluminescence material paste comprises: a first inorganic photoluminescence material having a first density, a second inorganic photoluminescence material having a second density and a light transmissive non-curable silicone fluid that is not curable by itself. The first density of the first inorganic photoluminescence material is different from the second density of the second inorganic photoluminescence material. The first and second inorganic photoluminescence materials are substantially homogenously distributed within the light transmissive non-curable silicone fluid to form the photoluminescence material paste. A weight loading of the first and second photoluminescence materials in the photoluminescence material paste is in a range of about 60% to about 95%.
Abstract:
A solid-state lamp is described that includes a wavelength conversion component located at one end of the lamp. The solid-state lamp comprises: one or more solid-state light emitting devices (typically LEDs); a thermally conductive body; at least one duct; and a photoluminescence wavelength conversion component remote to the one or more LEDs, located at one end of the lamp. The lamp is configured such that the duct extends through the photoluminescence wavelength conversion component and defines a pathway for thermal airflow through the thermally conductive body to thereby provide cooling of the body and the one or more LEDs.
Abstract:
Disclosed herein are green-emitting, garnet-based phosphors having the formula (Lu1-a-b-cYaTbbAc)3 (Al1-dBd)5(O1-eCe)12: Ce,Eu, where A is selected from the group consisting of Mg, Sr, Ca, and Ba; B is selected from the group consisting of Ga and In; C is selected from the group consisting of F, Cl, and Br; and 0≦a≦1; 0≦b≦1; 0
Abstract:
An LED-based light source for generating light having a selected dominant wavelength λds comprises a package housing a plurality of LEDs consisting of LEDs from first and second wavelength bins. The first wavelength bin comprises LEDs having a dominant wavelength λd1 that is within a first wavelength range and the second wavelength bin comprises LEDs having a dominant wavelength λd2 that is within a second wavelength range. The first wavelength bin can comprise LEDs having a dominant wavelength that is shorter than the selected dominant wavelength whilst the second wavelength bin comprises LEDs having a dominant wavelength that is longer than the selected dominant wavelength. The wavelength bins and number of LEDs are selected such that in operation the dominant wavelength of the combined light emitted by the source is the selected dominant wavelength. Lighting arrangements and light emitting devices incorporating such light sources are disclosed.