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:
Disclosed herein are yellow-green and yellow-emitting aluminate based phosphors for use in white LEDs, general lighting, and LED and backlighting displays. In one embodiment of the present invention, the cerium-activated, yellow-green to yellow-emitting aluminate phosphor comprises the rare earth lutetium, at least one alkaline earth metal, aluminum, oxygen, at least one halogen, and at least one rare earth element other than lutetium, wherein the phosphor is configured to absorb excitation radiation having a wavelength ranging from about 380 nm to about 480 nm, and to emit light having a peak emission wavelength ranging from about 550 nm to about 600 nm.
Abstract:
Phosphors comprising a nitride-based composition represented by the chemical formula: M(x/v)(M′aM″b)Si(c−x)AlxNd:RE, wherein: M is a divalent or trivalent metal with valence v; M′ is at least one divalent metal; M″ is at least one trivalent metal; 2a+3b+4c=3d; and RE is at least one element selected from the group consisting of Eu, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb. Furthermore, the nitride-based composition may have the general crystalline structure of M′aM″bSicNd, where Al substitutes for Si within the crystalline structure and M is located within the crystalline structure substantially at the interstitial sites.
Abstract translation:包括由化学式M(x / v)(M'aM“b)Si(c-x)Al x N d:RE表示的基于氮化物的组合物的荧光体,其中:M是价数v的二价或三价金属; M'是至少一种二价金属; M“是至少一种三价金属; 2a + 3b + 4c = 3d; RE为选自Eu,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb中的至少一种元素。 此外,基于氮化物的组合物可以具有M'aM“bSicNd”的一般结晶结构,其中Al代替晶体结构内的Si,M基本上位于间隙位置的晶体结构内。
Abstract:
Embodiments of the present invention are directed a β-SiAlON:Eu2+ based green emitting phosphor having the formula Eux(A1)6−z(A2)zOyN8−z(A3)2(x+z−y), where 0
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:
Phosphors comprising a nitride-based composition represented by the chemical formula: M(x/v)(M′aM″b)Si(c-x)AlxNd:RE, wherein: M is a divalent or trivalent metal with valence v; M′ is at least one divalent metal; M″ is at least one trivalent metal; 2a+3b+4c=3d; and RE is at least one element selected from the group consisting of Eu, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb. Furthermore, the nitride-based composition may have the general crystalline structure of M′aM″bSicNd, where Al substitutes for Si within the crystalline structure and M is located within the crystalline structure substantially at the interstitial sites.
Abstract translation:包含由化学式M(x / v)(M'aM“b)Si(c-x)Al x N d:RE表示的基于氮化物的组合物的荧光体,其中:M是价数v的二价或三价金属; M'是至少一种二价金属; M“是至少一种三价金属; 2a + 3b + 4c = 3d; RE为选自Eu,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb中的至少一种元素。 此外,基于氮化物的组合物可以具有M'aM“bSicNd”的一般结晶结构,其中Al代替晶体结构内的Si,M基本上位于间隙位置的晶体结构内。
Abstract:
An improved approach is provided for implementing LED lighting systems and lamps that address the issues identified above. A new type of LED package is disclosed that reduces manufacturing and production costs, while simultaneously allowing for improved thermal management and wide angle light distribution. A self-contained LED package is disclosed that can be mounted as an entire unit onto a lamp platform. The LED package permits the dimensional configuration of the package components to be aligned with desired emission angles. For example, overhangs between phosphor components and circuit boards in the package can be avoided, thereby ensuring that the final lighting system will provide any desired emission angles.
Abstract:
Embodiments of the present invention are directed to nitride-based, red-emitting phosphors in red, green, and blue (RGB) lighting systems, which in turn may be used in backlighting displays and warm white-light applications. In particular embodiments, the red-emitting phosphor is based on CaAlSiN3 type compounds activated with divalent europium. In one embodiment, the nitride-based, red emitting compound contains a solid solution of calcium and strontium compounds (Ca,Sr)AlSiN3:Eu2+, wherein the impurity oxygen content is less than about 2 percent by weight. In another embodiment, the (Ca,Sr)AlSiN3:Eu2+ compounds further contains a halogen in an amount ranging from about zero to about 2 atomic percent, where the halogen may be fluorine (F), chlorine (Cl), or any combination thereof. In one embodiment at least half of the halogen is distributed on 2-fold coordinated nitrogen (N2) sites relative to 3-fold coordinated nitrogen (N3) sites.
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.