Abstract:
A display backlight, comprising: an excitation source (42) for generating blue excitation light with a dominant emission wavelength in a range 445 nm to 465 nm; a red photoluminescence material with a peak emission wavelength in a range 610 nm to 650 nm; and a europium activated sulfide phosphor having a peak emission wavelength in a range 525 nm to 545 nm.
Abstract:
Disclosed are improved photoluminescence wavelength conversion components and lamps that incorporate such components. The photoluminescence wavelength conversion component comprises a hollow cylindrical tube having a given bore of diameter and an axial length. The relative dimensions and shape of the component can affect the radial emission pattern of the component and are configured to give a required emission pattern (typically omnidirectional). The photoluminescence material can be homogeneously distributed throughout the volume of the component during manufacture of the component. An extrusion method can be used to form the improved photoluminescence wavelength conversion component. Injection molding or casting can also be used to form the component. Another possible approach is to manufacture the component is by forming a flexible sheet material to include the phosphor and/or quantum dots, and then rolling the sheet material into the desired shape and dimensions for the component. The improved wavelength conversion components and lamps that incorporate these components provide for improved emission characteristic, while allowing for relatively cost-effective manufacturing costs. A further advantage of components is that their light emission resembles a filament of a conventional incandescent light bulb.
Abstract:
A light emitting device (LED-Filament) comprises: a light-transmissive substrate; at least one blue LED chip mounted on a face of the light-transmissive substrate; and a photoluminescence material at least partially covering the at least one blue LED chip. The photoluminescence material comprises phosphor particles of at least one Group IIA/IIB selenide sulfide-based phosphor material that generates red light with a peak emission wavelength in a range of 600 nm to 640 nm and a full width at half maximum emission intensity of 50 nm to 55 nm. The LED-filament can be incorporated in a lamp, with a yellow to green-emitting phosphor that generates yellow to green light with a peak emission wavelength in a range of 520 nm to 570 nm, to provide light with a color temperature in a range of 1500 K to 4000 K and a General Color Rendering Index (CRI Ra) of greater than or equal to 90 and a CRI R9 greater than or equal to 50.
Abstract:
A narrow band red phosphor may have a general composition MSxSeyAz:Eu, wherein M is at least one of Mg, Ca, Sr and Ba, A is at least one of C, N, B, P and a monovalent combining group NCN (cyanamide), and may in some embodiments further include one or more of O, F, Cl, Br and I. In embodiments 0.8
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:
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:
Red-emitting phosphors may comprise a nitride-based composition represented by the chemical formula MaSrbSicAldNeEuf, wherein: M is at least one of Mg, Ca, Sr, Ba, Y, Li, Na, K and Zn, and 0 2+d/v and v is the valence of M. Furthermore, nitride-based red-emitting phosphor compositions may be represented by the chemical formula MxM′2Si5-yAlyN8:A, wherein: M is Mg, Ca, Sr, Ba, Y, Li, Na, K and Zn, and x>0; M′ is at least one of Mg, Ca, Sr, Ba, and Zn; 0≦y≦0.15; and A is at least one of Eu, Ce, Tb, Pr, and Mn; wherein x>y/v and v is the valence of M, and wherein the red-emitting phosphors have the general crystalline structure of M′2Si5N8:A.
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 light emitting device comprises a light transmissive thermally conductive circuit board; an array of solid-state light emitters (LEDs) mounted on, and electrically connected to, at least one face of the circuit board; and a photoluminescence wavelength conversion component. The wavelength conversion component comprises a mixture of particles of at least one photoluminescence material (phosphor) and particles of a light reflective material. The emission product of the device comprises the combined light generated by the LEDs and the photoluminescence material. The wavelength conversion component can comprise a layer of the phosphor material and particles of a light reflective material applied directly to the array of LEDs in the form of an encapsulant. Alternatively the photoluminescence component is a separate component and remote to the array of LEDs such as tubular component that surrounds the LEDs.
Abstract:
The teachings are generally directed to phosphors having combination coatings with multifunctional characteristics that increase the performance and/or reliability of the phosphor. The teachings include highly reliable phosphors having coatings that contain more than one inorganic component, more than one layer, more than one thicknesses, more than one combination of layers or thicknesses, a gradient-interface between components, a primer thickness or layer to inhibit or prevent leaching of phosphor components into the coatings, a sealant layer to inhibit or prevent entry of moisture or oxygen from the environment, a mixed composition layer as a sealant and multifunctional combination coatings.