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Ground limestone-based bismuth and europium co-doped yellow fluorescent powder

A technology of heavy calcium carbonate and yellow phosphors, which is applied in the directions of luminescent materials, chemical instruments and methods, can solve the problems of poor stability of phosphors, limited application scope, and reduced quality, and achieves a short preparation period, Clear workflow and stable performance

Inactive Publication Date: 2014-01-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the calcium carbonate matrix, high temperature sintering over 650°C is easy to decompose it into CaO. Although the CaO-based Eu-doped phosphor has improved brightness due to the change of the matrix crystal form, the CaO matrix has a higher brightness than CaCO 3 Easy to deliquescence, resulting in poor stability of phosphors, lower quality, and limited application range

Method used

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  • Ground limestone-based bismuth and europium co-doped yellow fluorescent powder
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  • Ground limestone-based bismuth and europium co-doped yellow fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weighing raw material: CaCO 3 、Eu 2 o 3 、 Bi 2 o 3 , Li 2 CO 3 The molar ratio is weighed according to 100:1.5:3:1.5, and the raw materials are poured into a ball mill tank, fully ball milled for 1 hour, and mixed uniformly to obtain a precursor raw material powder with a particle size of 5-10 μm. Pour into a crucible. Then put it in a furnace at 500°C for pre-calcination for 4 hours, take out the sample, grind it, and emit red light under the excitation of ultraviolet light. CO at standard atmospheric pressure 2 In a protective atmosphere, calcinate in a high-temperature furnace at 900°C for 1 hour, take out the sample, and grind to obtain a white powder with a particle size of 15-25 μm, which emits yellow light when excited by ultraviolet light.

[0031] The specific X-ray diffraction data of the phosphor powder prepared by the above preparation method are as follows:figure 1 As shown, A in the figure is heavy CaCO 3 The X-ray diffraction pattern, B is sinter...

Embodiment 2

[0034] Weighing raw material: CaCO 3 , Eu(NO 3 ) 3 、 Bi 2 o 3 , Li 2 CO 3 、H 3 BO 3 Weigh the molar ratio according to 100:1:2:1:0.4, pour the raw materials into the agate tank of the ball mill, perform full ball milling for 1 hour, and mix evenly to obtain the precursor raw material powder with a particle size of 5-10 μm. Pour into the crucible. Then put it in a furnace at 500°C for calcination and pretreatment for 2h, take out the sample, and grind it. CO at standard atmospheric pressure 2 In a protective atmosphere, calcinate in a high-temperature furnace at 900°C for 2 hours, take out the sample, and grind to obtain a white powder with a particle size of 15-25 μm, which emits yellow light when excited by ultraviolet light.

Embodiment 3

[0036] Weighing raw material: CaCO 3 、Eu 2 o 3 , (BiO) 2 CO 3 、Na 2 CO 3 Weigh the molar ratio according to 100:1.5:4.5:1.5, pour the raw materials into the ball mill tank, perform full ball milling for 1 hour, and mix evenly to obtain the precursor raw material powder with a particle size of 5-10 μm, pour the precursor powder into crucible. Then put it in a furnace at 500°C for pre-calcination for 3 hours, take out the sample, grind it, and emit red light under the excitation of ultraviolet light. CO at standard atmospheric pressure 2 In a protective atmosphere, calcinate in a high-temperature furnace at 860°C for 3 hours, take out the sample, and grind to obtain a white powder with a particle size of 15-25 μm, which emits yellow light when excited by ultraviolet light.

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Abstract

The invention discloses ground limestone-based bismuth and europium co-doped yellow fluorescent powder. According to the fluorescent powder, ground limestone is used as matrix, EU<3+> is used as an activating agent, Bi<3+> ions are used as a sensitizing agent, and alkali carbonate is used as a fluxing agent and a charge compensation agent; and the molar ratio of ground limestone to EU<3+> to Bi<3+> to M2CO3 is 100:(1-5):(1-15):(0.5-2.5), wherein M is one or more of Li<+>, Na<+> or K<+>. The invention also discloses a preparation method for the ground limestone-based bismuth and europium co-doped yellow fluorescent powder; and the preparation method comprises the following steps of: accurately weighing raw materials, fully grinding the raw materials in a ball grinding mill, mixing uniformly to form powder and thus obtaining precursor, pre-treating in a high-temperature furnace, grinding, calcining the precursor at CO2 atmosphere of standard atmospheric pressure, and grinding to obtain a sample. The provided preparation method for the fluorescent powder is simple, and the fluorescent powder is stable in performance, and high in luminous intensity and has important application value.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to fluorescent powder and its preparation, especially to a heavy CaCO 3 Bismuth and europium co-doped yellow fluorescent powder as a matrix and a preparation method thereof. Background technique [0002] In recent years, phosphors have developed rapidly, and new systems have been continuously developed, such as titanate, silicate, oxide and aluminate systems. But based on carbonates, especially CaCO 3 Based on the phosphor powder, there are few researches at home and abroad. Calcium carbonate has excellent potential to become a phosphor matrix. On the one hand, there are three crystal forms of calcium carbonate, vaterite, calcite and aragonite. Different crystal forms lead to different positions replaced by dopant ions and different luminescent properties. On the other hand, calcium carbonate is also a very important chemical raw material, which is widely used in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/74
Inventor 鄢波刘金智卢忠隋成华魏高尧
Owner ZHEJIANG UNIV OF TECH
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