摘要:
There is provided a blue-green illumination system, comprising a light emitting diode, and at least one luminescent material having at least two peak emission wavelengths, wherein the emission CIE color coordinates of the at least two peak emission wavelengths are located within an area of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: e) x=0.0137 and y=0.4831; b) x=0.2240 and y=0.3890; c) x=0.2800 and y=0.4500; g) x=0.2879 and y=0.5196; and h) x=0.0108 and y=0.7220. The illumination system may be used as the green light of a traffic signal. The luminescent material may be a blend of (Ba1-xEux)Mg2Al6O27 (“BAM”) and (Ba1-xEux)Mg2-yMnyAl16O27 (“BAMMn”) phosphors, where 0
摘要:
There is provided white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 575 to about 620 nm, a second luminescent material having a peak emission wavelength of about 495 to about 550 nm, which is different from the first luminescent material and a third luminescent material having a peak emission wavelength of about 420 to about 480 nm, which is different from the first and second luminescent materials. The LED may be a UV LED and the luminescent materials may be a blend of three or four phosphors. The first phosphor may be an orange emitting Eu2+, M+ activated strontium pyrophosphate, Sr2P2O7:Eu2+, Mn2+. The second phosphor may be a blue-green emitting Eu2+ activated barium silicate, (Ba,Sr,Ca)2SiO4:Eu2+. The third phosphor may be a blue emitting SECA phosphor, (Sr,Ba,Ca)5(PO4)3Cl:Eu2+. Optionally, the fourth phosphor may be a red emitting Mn4+ activated magnesium fluorogermanate, 3.5MgO*0.5MgF2*GeO2:Mn4+. A human observer perceives the combination of the orange, blue-green, blue and/or red phosphor emissions as white light.
摘要:
There is provided a blue-green illumination system, comprising a light emitting diode, and a luminescent material having emission CIE color coordinates located within an area of a of a pentagon on a CIE chromaticity diagram, whose corners have the following CIE color coordinates: i) x=0.0137 and y=0.4831; ii) x=0.2240 and y=0.3890; iii) x=0.2800 and y=0.4500; iv) x=0.2879 and y=0.5196; and v) x=0.0108 and y=0.7220. The light emitting diode may be a UV LED and the luminescent material may be a Ba2SiO4:Eu2+ phosphor, a Ba2(Mg,Zn)Si2O7:Eu2+ phosphor and/or a Ba2Al2O4:Eu2+ phosphor. The illumination system may be used as the green light of a traffic light or an automotive display.
摘要:
Phosphor compositions including those having the formulas A2-xEuxW1-yMoyO6, where A is selected from Y, Gd, Lu, La, and combinations thereof; and where 0.5≦x≦1.0, 0.01≦y≦1.0; MmOnX, wherein M is selected from the group of Sc, Y, a lanthanide, an alkali earth metal and mixtures thereof; X is a halogen; 1≦m≦3; and 1≦n≦4, and wherein the lanthanide doping level can range from 0.1 to 40% spectral weight; and Eu3+ activated phosphate or borate phosphors. Also disclosed are light emitting devices including a light source and at least one of the above phosphor compositions.
摘要翻译:包括具有下式的那些荧光体组合物:具有下式的化合物:其中, > 6,其中A选自Y,Gd,Lu,La及其组合; 并且其中0.5 <= x <= 1.0,0.01 <= Y <= 1.0; M,其中M选自Sc,Y,镧系元素,碱土金属及其混合物; X是卤素; 1 <= m <= 3; 和1 <= n <= 4,并且其中所述镧系元素掺杂水平可以在0.1至40%光谱重量范围内; 和Eu 3+激活的磷酸盐或硼酸盐荧光体。 还公开了包括光源和至少一种上述荧光体组合物的发光器件。
摘要:
There is provided white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 575 to about 620 nm, a second luminescent material having a peak emission wavelength of about 495 to about 550 nm, which is different from the first luminescent material and a third luminescent material having a peak emission wavelength of about 420 to about 480 nm, which is different from the first and second luminescent materials. The LED may be a UV LED and the luminescent materials may be a blend of three or four phosphors. The first phosphor may be an orange emitting Eu2+, Mn2+ activated strontium pyrophosphate, Sr2P2O7:Eu2+, Mn2+. The second phosphor may be a blue-green emitting Eu2+ activated barium silicate, (Ba,Sr,Ca)2SiO4:Eu2+. The third phosphor may be a blue emitting SECA phosphor, (Sr,Ba,Ca)5(PO4)3Cl:Eu2+. Optionally, the fourth phosphor may be a red emitting Mn4+ activated magnesium fluorogermanate, 3.5MgO*0.5MgF2*GeO2:Mn4+. A human observer perceives the combination of the orange, blue-green, blue and/or red phosphor emissions as white light.
摘要:
A sensing element or detector activated by radiation comprising a first scintillator activated by gamma radiation; and a neutron sensing layer comprising a second scintillator activated by neutron radiation.
摘要:
A lamp containing a radiation source, a luminescent material and a radiation scattering material located between the radiation source and the luminescent material is provided. The lamp may be a white emitting lamp. The radiation source may be a blue emitting LED. The luminescent material may be a yellow emitting phosphor or dye. The radiation scattering material may be ceramic particles, such as TiO2 particles, in a carrier medium, such as glass, epoxy or silicone.
摘要:
A method of forming high-purity elemental silicon is disclosed. The method includes the step of heating a silica gel composition, or an intermediate composition derived from a silica gel composition, wherein the silica gel composition or intermediate composition includes at least about 5% by weight carbon, and the heating temperature is above about 1550° C. The heating step results in the production of a product which includes elemental silicon. Another aspect of the invention relates to a method for making a photovoltaic cell. The method includes the step of forming a semiconductor substrate from elemental silicon prepared as described in this disclosure. Additional steps are then undertaken to fabricate the photovoltaic device.
摘要:
Disclosed herein is a method comprising disposing a casting composition within a sacrificial die; wherein internal features of the sacrificial die provide a replica of a desired casting; wherein the casting composition has a viscosity of about 1 to about 1,000 Pascal-seconds at room temperature when tested at a shear rate of up to 70 seconds−1; reacting the casting composition to form a gel matrix; removing the sacrificial die; extracting a solvent from the gel matrix to form a dried gel; and firing the dried gel to form a ceramic core. Disclosed herein too is a casting composition comprising a monomer and/or a polymer; and a metal and/or ceramic powder; wherein the casting composition has a viscosity of about 1 to about 1,000 Pascal-seconds at room temperature when tested at a shear rate of up to 70 seconds−1 and a flow index of less than 0.6.
摘要:
An apparatus including a crucible, an energy source, and a controller is provided. The crucible may be sealed to a nitrogen-containing gas, and may be chemically inert to at least ammonia at a temperature in a range of about 400 degrees Celsius to about 2500 degrees Celsius. The energy source may supply thermal energy to the crucible. The controller may control the energy source to selectively direct sufficient thermal energy to a predefined first volume within the crucible to attain and maintain a temperature in the first volume to be in a range of from about 400 degrees Celsius to about 2500 degrees Celsius. The thermal energy may be sufficient to initiate, sustain, or both initiate and sustain growth of a crystal in the first volume. The first temperature in the first volume may be controllable separately from a second temperature in another volume within the crucible. The first temperature and the second temperature differ from each other. Associated methods are provided.