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Silicate luminescent material and preparation method thereof

A technology of luminescent materials and silicates, which is applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of low color rendering and high color temperature, and achieve simple process steps, easy control of process conditions, and good photoluminescence performance Effect

Inactive Publication Date: 2011-02-02
OCEANS KING LIGHTING SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, in view of the defects of low color rendering and high color temperature of the fluorescent materials used in the LED white light emission in the prior art, it is necessary to provide an LED that is suitable for excitation in the ultraviolet region and can emit green light efficiently. silicate luminescent material

Method used

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  • Silicate luminescent material and preparation method thereof
  • Silicate luminescent material and preparation method thereof
  • Silicate luminescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Example 1, the chemical formula of the main component is 0.4CaO 0.6Al 2 o 3 1.0 SiO2 2 : Preparation of 0.01Ce, 0.04Tb silicate luminescent material:

[0026] Weigh calcium carbonate (CaCO 3 ) 0.4g, alumina (Al 2 o 3 ) 0.612g, silicon dioxide (SiO 2 ) 0.601g, cerium oxide (CeO 2 )0.0172g and terbium oxide (Tb 4 o 7 ) 0.0748g, put the weighed raw materials into a corundum crucible after grinding and mixing them evenly in an agate mortar, then put the corundum crucible with raw materials into a high-temperature tube furnace, at a volume ratio of 95% N 2 +5%H 2 Raise the temperature to 1300°C in a reducing atmosphere, keep warm and calcinate for 10 hours under this condition, cool to room temperature, and grind the cooled product to obtain the chemical formula of the main component as 0.4CaO·0.6Al 2 o 3 1.0 SiO2 2 : 0.01Ce, 0.04Tb silicate luminescent material, the silicate luminescent material of this embodiment emits 430nm broadband blue light and 544nm narro...

Embodiment 2

[0027] Example 2, the chemical formula of the main component is 2.5CaO·1.2Al 2 o 3 1.0 SiO2 2 : Preparation of 0.1Ce, 0.05Tb silicate luminescent material:

[0028] Weigh calcium oxide (CaO) 1.4g, aluminum oxide (Al 2 o 3 ) 1.224g, silicon dioxide (SiO 2 ) 0.601g, cerium oxide (CeO 2 )0.1721g and terbium oxide (Tb 4 o 7 ) 0.0935g, put the weighed raw materials into a corundum crucible after grinding and mixing them evenly in an agate mortar, put the corundum crucible into a high-temperature box furnace, raise the temperature to 1400°C and heat-preserve and calcinate for 20 hours, then cool to room temperature , to obtain the intermediate product, after grinding the intermediate product evenly, put it into the corundum crucible again, then put the corundum crucible into the high-temperature tube furnace, in H 2 Raise the temperature to 1000°C in a reducing atmosphere, keep it warm and calcined for 20 hours under this condition, then cool to room temperature, and grind t...

Embodiment 3

[0029] Example 3, the chemical formula of the main component is 1.9CaO 0.68Al 2 o 3 1.0 SiO2 2 : Preparation of 0.02Ce, 0.08Tb silicate luminescent material:

[0030] Weigh calcium carbonate (CaCO 3 ) 1.9g, alumina (Al 2 o 3)0.6936g, silicon dioxide (SiO 2 ) 0.601g, cerium oxide (CeO 2 )0.0344g and terbium oxide (Tb 4 o 7 ) 0.1495g, put the weighed raw materials into a corundum crucible after grinding and mixing them evenly in an agate mortar, put the corundum crucible into a high-temperature box furnace, raise the temperature to 1430°C and heat-preserve and calcinate for 6 hours, then cool to room temperature , to obtain an intermediate product, after grinding the intermediate product evenly, put it into a corundum crucible again, and then put the corundum crucible into a high-temperature tube furnace, at a volume ratio of 95% N 2 +5%H 2 Raise the temperature to 1350°C in a reducing atmosphere, keep it warm and calcined for 4 hours under this condition, then cool to...

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Abstract

The invention discloses a silicate luminescent material and a preparation method thereof. The chemical formula of the luminescent material is aCaO.bAl2O3.cSiO2:xCe,yTb. The preparation method of the luminescent material comprises the following steps: using at least one of oxide, carbonate and oxalate of Ca, Al2O3, SiO2 and Tb4O7 as raw materials; weighing the raw materials according to the mol ratio of elements in the chemical formula aCaO.bAl2O3.cSiO2:xCe,yTb; and evenly mixing the raw materials, heating to 1000-1500 DEG C in the reducing atmosphere, calcining at constant temperature for 4-20 hours, cooling to room temperature, and grinding to obtain the luminescent material. The silicate luminescent material is suitable for LED excitation in ultraviolet regions, and can emit green light in high efficiency. The preparation method has the advantages of simple technique and low cost.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a silicate luminescent material and a preparation method thereof. The luminescent material is suitable for excitation of LEDs in the violet light region and realizes high-efficiency green light emission. Background technique [0002] Because semiconductor lighting (LED lighting) has many advantages such as no need for idling time, fast response (about 10^-9 seconds), small size, energy saving, high reliability, and flexible application, it is widely used in automobiles. , communication industry, computer, traffic lights, backlight for LCD panels, LED screens and general lighting, especially the new semiconductor lighting source represented by the third-generation semiconductor material gallium nitride, the power consumption is only 1 / 10 of ordinary incandescent lamps, life can reach more than 100,000 hours. [0003] At present, the main way to realize LE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 周明杰马文波时朝璞
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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