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White light emitting base metal rare earth tetrametaphosphate luminous material for non-hg fluorescent lamp and preparing process thereof

A technology of tetrametaphosphate and luminescent materials, which is applied in the field of luminescent materials for mercury-free fluorescent lamps and its preparation, can solve the problems of heavy metal mercury pollution in mercury-containing fluorescent lamps, achieve the effects of opening up utilization channels, good color purity, and reducing production costs

Inactive Publication Date: 2008-07-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of heavy metal mercury pollution in existing mercury-containing fluorescent lamps, and provide a luminescent material that can emit white light under the condition of no mercury excitation, and has good color purity of alkali metal rare earth tetrametaphosphate

Method used

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  • White light emitting base metal rare earth tetrametaphosphate luminous material for non-hg fluorescent lamp and preparing process thereof
  • White light emitting base metal rare earth tetrametaphosphate luminous material for non-hg fluorescent lamp and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh anhydrous lithium carbonate (Li 2 CO 3 ) 0.2217g, lanthanum oxide (La 2 o 3 )0.4887g, diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ] 3.1694g, dysprosium oxide (Dy 2 o 3 ) 0.5595g, fully grind in an agate mortar, mix evenly, put the obtained powder mixture into an alumina crucible with a size of 25mm×25mm, then put it into a heating furnace, heat up to 700°C, and After keeping the temperature in the air for 40 hours, cool down to room temperature naturally, take it out, and grind it in an agate mortar to get the final product.

Embodiment 2

[0016] Weigh anhydrous lithium carbonate (Li 2 CO 3 )0.2217g, gadolinium oxide (Gd 2 o 3 )0.5438g, diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ] 3.1694g, dysprosium oxide (Dy 2 o 3 ) 0.5595g, other conditions are with embodiment 1. In the air, keep 700°C, keep the temperature at a constant temperature for 40 hours, then cool down to room temperature naturally, take it out, and grind it in an agate mortar to get the final product.

Embodiment 3

[0018] Weigh anhydrous lithium carbonate (Li 2 CO 3 )0.2217g, lutetium oxide (Lu 2 o 3 ) 1.0744g, ammonium dihydrogen phosphate [NH 4 h 2 PO 4 ] 2.7607g, dysprosium oxide (Dy 2 o 3 ) 0.1119g, other conditions are with embodiment 1. Keep the temperature at 600°C in the air for 30 hours, then cool down to room temperature naturally, take it out, and grind it in an agate mortar to get the final product.

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Abstract

The invention discloses a white light luminescent alkali metal rare earth tetrametaphosphate luminescent material used for non-mercury discharge fluorescent lamp, in which the chemical composition expression is M(RE1-xDyx)(PO3)4. M chosen from Li<+>, Na<+>, K<+>, Rb<+> and Cs<+> is the alkali metal ion. RE chosen from La, Gd, Y and Lu is the rare earth element. Dy<3+> (trivalent rare earth dysprosium ion) is the active ion and x in which the value range is that 0.005 is less than or equal to x and the x is less than or equal to 0.50 is the molar content of the active ion (dysprosium ion) corresponding to the rare earth mental ion. The luminescent material has the strong absorption within the vacuum ultraviolet band; meanwhile, the rare earth dysprosium ion emits the white light under the activation of the vacuum ultraviolet light. The invention also discloses a preparation method of the luminescent material with simple preparation procedure. The prepared luminescent material emits the white light of the best purity with proper color coordinate which is suitable for the non-mercury discharge fluorescent lamp.

Description

technical field [0001] The invention relates to a luminescent material for a mercury-free fluorescent lamp and a preparation technology thereof. Background technique [0002] Fluorescent lamps and cold-cathode fluorescent lamps are the main indoor lighting sources and ideal backlights for liquid crystal devices. Three kinds of phosphors or two kinds of phosphors, yellow and blue, have an electrode at each end. When high voltage is applied to both ends of the lamp tube, the mercury vapor in the lamp tube is excited by electrons to form plasma, which can radiate 254 nanometer (nm) ultraviolet light, and the ultraviolet light excites the fluorescent light coated on the inner wall of the lamp tube. The powder emits light, and the red-green-blue or yellow-blue light emitted by the phosphor mixes to produce white light. [0003] Mercury in fluorescent lamps and cold-cathode fluorescent lamps is a volatile liquid heavy metal that is harmful to the environment. During the producti...

Claims

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Application Information

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IPC IPC(8): C09K11/81H01J61/44
CPCY02B20/181Y02B20/00
Inventor 梁宏斌钟玖平苏锵
Owner SUN YAT SEN UNIV
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