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Yellow long-lasting phosphor material and preparation method thereof

A long-lasting luminescence and yellow technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of alternating current flickering, etc., and achieve the effect of low raw material cost, easy availability of raw materials, and simple preparation method

Inactive Publication Date: 2015-01-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AC LEDs can be directly driven by AC100~220V, but the fatal problem is the strobe caused by AC

Method used

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  • Yellow long-lasting phosphor material and preparation method thereof
  • Yellow long-lasting phosphor material and preparation method thereof
  • Yellow long-lasting phosphor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Example 1: 1.65SrO 0.35CaO SiO 2 0.50Eu 2 o 3 0.50Dy 2 o 3 Phosphor Synthesis

[0025] Weigh 0.8549g of strontium oxide (SrO), 0.0981g of calcium oxide (CaO), silicon dioxide (SiO 2 ) 0.3004g, europium trioxide (Eu 2 o 3 ) 0.8798g, Dysprosium trioxide (Dy 2 o 3 ) 0.9325g, fully ground in an agate mortar and mixed evenly, and then sintered in two steps: first, pre-sintered at a lower temperature of 500°C for 4 hours, cooled to room temperature, taken out and fully ground again and mixed evenly, in a carbon monoxide CO atmosphere Sintering at 1200°C for 8 hours. The sample is taken out and ground to finally obtain the sample. After being irradiated with light of 250nm-550nm, the sample emits a strong yellow long afterglow.

Embodiment 2

[0026] Example 2: 2.54SrO 0.45CaO SiO 2 0.005Eu 2 o 3 0.005Dy 2 o 3 Phosphor Synthesis

[0027] Weigh strontium nitrate [Sr(NO 3 ) 2 ] 2.6877g, calcium carbonate (CaCO 3 ) 0.2252g, silicon monoxide (SiO) 0.2204g, europium trioxide (Eu 2 o 3 ) 0.0088g, Dysprosium trioxide (Dy 2 o 3 ) 0.0093g, fully ground in an agate mortar and mixed evenly, then sintered in two steps: first, pre-sintered at a lower temperature of 550°C for 3 hours, cooled to room temperature, taken out and fully ground again and mixed evenly, under carbon reduction Sinter at 1350°C for 7.5 hours. The sample is taken out and ground to finally obtain the sample. After being irradiated with light of 250nm-550nm, the sample emits a strong yellow long afterglow.

Embodiment 3

[0028] Example 3: 2.37 SrO 0.6CaO SiO 2 0.01Eu 2 o 3 0.02Dy 2 O = Synthesis of Phosphor Powder

[0029] Weigh 1.2279g of strontium oxide (SrO), calcium nitrate [Ca(NO 3 ) 2 4H 2 O] 0.7084g, silicon dioxide (SiO 2 ) 0.3004g, europium trioxide (Eu 2 o 3 ) 0.0176g, Dysprosium trioxide (Dy 2 o 3 ) 0.0373g, fully ground in an agate mortar and mixed uniformly, and then sintered in two steps: first, pre-sintered at a lower temperature of 600°C for 2.5 hours, cooled to room temperature, taken out and thoroughly ground again and mixed uniformly, in hydrogen and nitrogen Sintering at 1400°C for 6.5 hours in a mixed atmosphere. The sample is taken out and ground to finally obtain the sample. After being irradiated with light of 250nm-550nm, the sample emits a strong yellow long afterglow.

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Abstract

The invention provides a yellow long-lasting phosphor material with a chemical composition general formula being aSrO.bCaO.SiO2.cEu2O3.dDy2O3, wherein a, b, c and d are mole numbers, a+b+c+d=3, b is 0.35-1.7, c is 0.001-0.5 and d is 0.001-0.5. The invention further provides a preparation method of the fluorescent powder which can be excited by light in a range of 250-500nm. When exciting light irradiation of the wave band or sunlight irradiation is stopped, the stronger yellow long-lasting phosphor effect can be generated, wherein the main peak is 570nm.

Description

technical field [0001] The present invention relates to the field of long-lasting luminescent materials, and more specifically, to a yellow long-lasting luminescent material and a preparation method thereof. Background technique [0002] Traditional long afterglow materials are mainly zinc sulfide (ZnS:Cu) and alkaline earth sulfide (CaS:Bi, Ca, SrS:Bi) phosphors. Although rare-earth-activated sulfide long-lasting luminescent materials have the advantages of bright body color, fast absorption under weak light, and various luminous colors, they still have the chemical instability of traditional sulfide long-lasting materials, which will dissolve in the air under sunlight. The water reaction releases H 2 Disadvantages such as S gas. In the 1960s, Japanese researchers discovered SrAl 2 o 4 :Eu 2+ The long afterglow phenomenon; in the mid-1990s, scientific and technological workers developed a new type of SrAl with significantly improved performance 2 o 4 :Eu 2+ , Dy 3+...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 王静李烨李保红欧阳雨苏锵
Owner SUN YAT SEN UNIV