Near-white luminescent powder having afterglow property
A technology of white luminescence and luminescent powder, applied in luminescent materials, chemical instruments and methods, energy-saving lighting, etc., can solve the problems of poor lighting, lower light source brightness, and affect light source luminous flux, etc., and achieve long afterglow time and high brightness Effect
Inactive Publication Date: 2008-08-27
LANZHOU UNIVERSITY
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Problems solved by technology
But this technology will have the following two problems: i) The long afterglow luminescent powder is opaque or colored, which will affect the luminous flux of the original light source after coating, reduce the brightness of the original light source, or change the color of the light
But this kind of material that emits blue-purple light is very easy to produce negative effects when it is applied to the indicator light in a special position, and the lighting used for special occasions is also not very good.
[0005] It will undoubtedly be very meaningful if a kind of white or near-white light and material with afterglow properties are used as instructions or lighting in special cases at stair passages, emergency exits, etc., but in the prior art There is no report of a white long afterglow material with better performance
Method used
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[0014] Examples of the invention are provided below.
[0015] According to molar ratio CaCO 3 : SrCO 3 :Al 2 o 3 :Eu 2 o 3 :Nd 2 o 3 1: 0.4: 1.0: 0.00125: 0.0025 respectively weigh calcium carbonate, strontium carbonate, aluminum oxide, europium oxide, and niobium oxide with a content of 99.9%, and the calcium oxide, strontium oxide, and niobium oxide used The purity of aluminum, europium trioxide and neodymium trioxide is 99.9%. Grind the weighed raw material powder in the organic grinding bucket until it is evenly mixed, put the mixed powder into the tunnel kiln, wait for the temperature to rise to 1350-1450°C, and pass nitrogen gas for 15 minutes to drive the oxygen out of the tunnel kiln, and then put Change the air flow to a mixed gas containing 80% nitrogen and 20% hydrogen, keep it warm for 3 hours to fully react the raw material powder, then stop heating, let the sample cool down to room temperature with the furnace, take out the sample, grind and sieve the sam...
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The invention discloses a luminescent material which has longer afterglow and can irradiate close to white light and the process for preparation. The chemical structural formula of the chemical structural formula of the invention is that CaO-0.4SrO-Al2O3:Eu2+, Nd3+. The luminescent powder if the invention adopts a high-temperature solid phase reaction method to prepare.
Description
technical field [0001] The invention relates to a luminescent powder with afterglow and a preparation method of the luminescent powder. To be precise, the present invention is a fluorescent material with long afterglow and capable of emitting near-white light, and a preparation method of this material. Background technique [0002] In order to solve the lighting under special circumstances, especially after a sudden power failure caused by a fire or earthquake that causes a failure of the power supply system, it is necessary to set up instructions and lighting in stair passages, emergency exits, etc., usually except in dark places such as stair passages and emergency exits. In addition to installing the lighting source and indicating light source with external batteries, incandescent lamps or other indicating light sources coated with long-lasting luminescent powder on the outer layer can also be placed in these places to play an emergency role. [0003] When using the inca...
Claims
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IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 王育华王雷徐旭辉李艳琴龚宇
Owner LANZHOU UNIVERSITY