摘要:
A novel process for the preparation of ultra-fine powders of metal oxide wherein a surfactant is added to the solution for the preparation of the metal oxide to provide nanometer metal oxide powders without the utilization of vacuum or high pressure conditions is disclosed.
摘要:
Preparation of superconducting epitaxial film using the method of liquid phase epitaxial growth comprising the steps of:(1) melting the oxides of bismuth, calcium, strontium, and copper or the oxides of thallium, calcium, barium, and copper at temperature in the range of 900.degree. C. to 950.degree. C. to form a melt;(2) contacting the melt in (1) with magnesium oxide or mono crystalline materials;(3) lowering the temperature of the melt at a rate of 0.3.degree.-2.degree. C./min until the temperature is within the range of 820.degree. C. to 890.degree. C.;(4) separating the melt and the magnesium oxide substrate or mono crystalline material to obtain a superconducting epitaxial film; and(5) quenching said film in (4) until the temperature thereof is at room temperature, whereby a superconducting epitaxial film having a thickness of 40 to 150 .mu.m is obtained.
摘要:
A white-light emitting device and its preparation method are provided. The white-light emitting device comprises an ultraviolet (UV) light emitting diode (LED) chip, a first phosphor, and a second phosphor, wherein the UV LED chip generates a first radiation; the first phosphor is composed of Zn(C3N2H4)2 powder and is excited by the first radiation to generate a second radiation; and the second phosphor is excited by the first radiation and/or the second radiation to generate a third radiation. The third radiation is then mixed with the first radiation and/or the second radiation to generate a white light.
摘要翻译:提供了一种白光发射装置及其制备方法。 白光发射装置包括紫外(UV)发光二极管(LED)芯片,第一荧光体和第二荧光体,其中UV LED芯片产生第一辐射; 第一荧光体由Zn(C 3 N 2 H 4)2粉末组成,并被第一辐射激发以产生第二辐射; 并且第二荧光体被第一辐射和/或第二辐射激发以产生第三辐射。 然后将第三辐射与第一辐射和/或第二辐射混合以产生白光。
摘要:
This application discloses a light-emitting device with narrow dominant wavelength distribution and a method of making the same. The light-emitting device with narrow dominant wavelength distribution at least includes a substrate, a plurality of light-emitting stacked layers on the substrate, and a plurality of wavelength transforming layers on the light-emitting stacked layers, wherein the light-emitting stacked layer emits a first light with a first dominant wavelength variation; the wavelength transforming layer absorbs the first light and converts the first light into the second light with a second dominant wavelength variation; and the first dominant wavelength variation is larger than the second dominant wavelength variation.
摘要:
A method for manufacturing metal nano particles having a hollow structure is provided. First, a suitable reducing agent is added into a first metal salt solution, and first metal ions are reduced to form first metal nano particles. Next, after the reducing agent is decomposed, a second metal salt solution with a higher reduction potential than that of the first metal is added. Then, the first metal particles are oxidized to form first metal ions when the second metal ions are reduced on the surface of the first metal by electrochemical oxidation reduction reaction, and thus, second metal nano particles having a hollow structure and a larger surface area are obtained. The method is simple and the metal nano particles with uniform particle size are obtained by this method.
摘要:
Disclosed is a phosphor and a method for preparing the same. The phosphor comprises a material having a general composition formula expressed by M1Si6N8−xOx (satisfying 0≦x≦1), where M is alkaline earth metal.
摘要:
A phosphor is represented by below formula: AaBbCcDdEe:Mm wherein, M represents at least one activator selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb and combinations thereof; A represents at least one element selected from Ca2+, Sr2+, Ba2+ and combinations thereof; B represents C4+, Si4+ or Ge4+; C represents B3+, Al3+ or Ga3+; D and E each independently represent at least one element selected from N, O, F and combinations thereof; m+a=2; 0.00001≦m≦0.1; 0.5≦b+c≦8; and 0.5≦d+e≦10. The phosphor has a color render index of greater than 50 and is suitable to be applied in a white LED to improve the color rendering property of the white light. A method of preparing the phosphor is also provided.
摘要翻译:荧光体由下式表示:AaBbCcDdEe:Mm其中,M表示选自Mn,Ce,Pr,Nd,Sm,Eu,Tb,Dy,Ho,Er,Tm,Yb中的至少一种活化剂及其组合; A表示选自Ca 2+,Sr 2+,Ba 2+及其组合中的至少一种元素; B表示C4 +,Si4 +或Ge4 +; C表示B3 +,Al3 +或Ga3 +; D和E各自独立地表示选自N,O,F及其组合中的至少一种元素; m + a = 2; 0.00001≦̸ m≦̸ 0.1; 0.5≦̸ b + c≦̸ 8; 和0.5≦̸ d + e≦̸ 10。 荧光体具有大于50的着色指数,并且适用于白色LED中以提高白光的显色性能。 还提供了制备荧光体的方法。
摘要:
This application discloses a light-emitting device with narrow dominant wavelength distribution and a method of making the same. The light-emitting device with narrow dominant wavelength distribution at least includes a substrate, a plurality of light-emitting stacked layers on the substrate, and a plurality of wavelength transforming layers on the light-emitting stacked layers, wherein the light-emitting stacked layer emits a first light with a first dominant wavelength variation; the wavelength transforming layer absorbs the first light and converts the first light into the second light with a second dominant wavelength variation; and the first dominant wavelength variation is larger than the second dominant wavelength variation.
摘要:
The present disclosure provides an illuminating system including a light emitting device and a luminescent material disposed approximate the light-emitting device. The luminescent material includes a strontium silicon nitride (SrSi6N8) doped by one of cerium (Ce3+) and cerium (Ce3+) and lithium (Li+).
摘要翻译:本公开提供一种照明系统,包括发光装置和近似于发光装置的发光材料。 发光材料包括由铈(Ce 3+)和铈(Ce 3+)中的一种和锂(Li +)之一掺杂的氮化硅锶(SrSi 6 N 8)。
摘要:
The present invention relates to a method for preparing catalyst platinum supported on lithium cobalt oxide for sodium borohydride hydrolysis. The catalyst with crystalline platinum is produced by mixing dihydrogen hexachloroplatinumate and black lithium-cobalt-oxide powder with the impregnation method, and then by a two-step sintering. Platinum is the major catalytic activity site, and lithium cobalt oxide is the support thereof. The manufacturing process of the present invention is simple, and can be applied to catalytic reactions or electrocatalytic reactions in fuel cells. Thereby, the present method is very practical to industry.