摘要:
According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.
摘要:
A coating system for a fluorescent lamp, and fluorescent lamps provided therewith. The coating system includes a phosphor-containing coating containing a mixture of phosphors that contain less than 10% weight rare earth phosphors. The phosphor-containing coating emits visible light having a color rendering index of at least 87 when excited by UV radiation.
摘要:
The present invention relates to a process for preparing rare earth trichromatic phosphor, comprising the following steps: (1) providing precursors for at least one composition formula selected from the group consisting of CaBPO5:xEu:yTb, CaAlrB1-rPO5:xEu:yTb and Ca2B5O9Cl:xEu:yTb, wherein x=0.02–0.05 (mole ratio), y=0.001–0.01 (mole ratio) and r=0.5–0.8; (2) grinding and mixing the precursors; and (3) calcining the product obtained in step (2) at 800–1000° C. for 3–5 hours. According to the present process, only one matrix material and two rare earth reactive ions (Eu3+ and Tb3+) are required to synthesize rare earth trichromatic phosphor. That is to say, no reducing reagent is needed; and absence of reducing agent(s) reduces environmental pollution.
摘要翻译:本发明涉及一种制备稀土三基色荧光粉的方法,包括以下步骤:(1)提供至少一种选自CaBPO 5:xEu:yTb的组成式的前体, u r r> u u u u u u u u u u u u u u u u u u u u u u u u u u u u::/ / / / / / / / / / / / / / / / / / / / / / / / 其中x = 0.02-0.05(摩尔比),y = 0.001-0.01(摩尔比)和r = 0.5-0.8;其中x = 0.02-0.05(摩尔比) (2)研磨和混合前体; 和(3)将步骤(2)中得到的产物在800-1000℃煅烧3-5小时。 根据本发明,只需要一种基质材料和两种稀土反应离子(Eu 3+ + 3+和Tb 3+)来合成稀土三色荧光体。 也就是说,不需要还原剂; 并且没有还原剂减少了环境污染。
摘要:
The long afterglow silicate luminescent materials which main chemical composition formula is: aMO-bM'O-cSiO.sub.2 -dR:Eu.sub.x Ln.sub.y, wherein M represents one or more elements selected from a group consisting of Sr, Ca, Ba and Zn; M' represents one ore more elements selected from a group consisting of Mg, Cd and Be; R represents one or two components selected from B.sub.2 O.sub.3 and P.sub.2 O.sub.5 ; Ln represents one or more elements selected from a group consisting of Nd, Dy, Ho, Tm, La, Pr, Tb, Ce, Mn, Bi, Sn and Sb; a, b, c, d, x and y are mole coefficients; wherein 0.6.ltoreq.a.ltoreq.6, 0.ltoreq.b.ltoreq.5, 1.ltoreq.o.ltoreq.9, 0.ltoreq.d.ltoreq.0.7, 0.00001.ltoreq.x.ltoreq.0.2, and 0.ltoreq.y.ltoreq.0.3; these luminescent materials have long afterglow characteristic after absorbing short wavelength lights.
摘要翻译:主要化学组成式为:aMO-bM'O-cSiO2-dR:EuxLny的长余辉硅酸盐发光材料,其中M表示选自Sr,Ca,Ba和Zn中的一种或多种元素; M'表示选自Mg,Cd和Be中的一种以上元素; R表示选自B 2 O 3和P 2 O 5中的一种或两种组分; Ln表示选自Nd,Dy,Ho,Tm,La,Pr,Tb,Ce,Mn,Bi,Sn和Sb中的一种或多种元素; a,b,c,d,x和y是摩尔系数; 其中0.6≤i≤6,0≤b≤5,0≤b≤0.0,0.0≤n≤0.7,0.00001≤x≤0.2 ,0
摘要:
A low-pressure mercury vapor discharge lamp having a very satisfactory color rendition, (R(a,8).gtoreq.85), a color temperature of 2300-3300 K and a color point on or near the Planckian curve. The lamp is provided with a luminescent layer comprising:a. a luminescent alkaline earth metal halophosphate activated by Sb.sup.3+ and Mn.sup.2+ having a color temperature of 2900-5000 K;b. a luminescent material activated by Eu.sup.2+ with an emission maximum van 470-500 nm and a half-value width of at most 90 nm, andc. a luminescent rare earth metal metaborate activated by Ce.sup.3+ and Mn.sup.2+, having a fundamental lattice Ln(Mg,Zn,Cd) B.sub.5 O.sub.10, in which Ln represents the elements Y, La and/or Gd, which borate has red Mn.sup.2+ emission.Further, the lamp is provided with means for absorbing blue radiation having wavelengths below 480 nm. Preferably, the luminescent layer further contains:d. a luminescent material activated by Tb.sup.3+ which exhibits green Tb.sup.3+ emission.Besides a very satisfactory color rendition at a low color temperature, these lamps have a high luminous flux and a high maintenance of the luminous flux during their life.
摘要:
Yellow emitting fluorescent lamp phosphors comprise cerium and manganese activated calcium-strontium fluoroapatite compositions represented by the approximate formula(Ca.sub.1-t Sr.sub.t).sub.v Ce.sub.w Mn.sub.x (PO.sub.4).sub.y F.sub.zwhereint is from 0 to 1v is from about 4.12 to about 4.30w is about 0.295x is from about 0.147 to about 0.295y is about 3.0z is from about 1.72 to about 2.21.An improved two step firing process for producing the disclosed phosphors is described and an improved fluorescent lamp employing the disclosed phosphors is also described.
摘要:
In a radiographic image conversion method in which a stimulating light is irradiated to a panel storing a radiation energy in the form of an image to reproduce and then to read out the image, the response speed of a stimulation and the reading speed of a radiographic image area increased by making use of (1) a phosphate type phosphor having the composition, xM.sub.3 (PO.sub.4).sub.2.NX.sub.2 :yA or M.sub.3 (PO.sub.4).sub.2 :yA, which is a highly sensitive phosphor capable of readily releasing the stored energy when a stimulating light is irradiated to the phosphor, and (2) the stimulating light having the range of the wavelengths from a visible ray of not shorter that 500 nm to an infrared ray.
摘要:
Disclosed is a blue-green emitting halophosphate phosphor activated with divalent europium, which is represented by the general formula:M.sub.5-x X(PO.sub.4).sub.3 :Eu.sup.2+.sub.(x)wherein M consists of Ba, Ca and Mg, X is one or more of F, Cl or Br, and x is a positive number of less than 5.
摘要:
Improved fluorescent lamps utilize phosphors which comprise a major amount of a particulate phosphor such as a cool white alkaline earth halophosphate coated with a minor amount of a protective coating consisting of NaCs.sub.2 PrCl.sub.6.