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Vanadate upconversion material fluorescent powder, and preparation method and application thereof

A conversion material and vanadate technology, which is applied in luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., can solve the problems of color coordinate drift of mixed white light, UV pollution of LED chips, etc., and achieve the effect of avoiding pollution

Inactive Publication Date: 2012-07-18
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are not many phosphor materials that can be used for white light LEDs, and the LED chips excited by ultraviolet light may also produce ultraviolet pollution; due to the temperature rise of the three primary color mixed LED chips, it is easy to cause the drift of the color coordinates of the mixed white light

Method used

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  • Vanadate upconversion material fluorescent powder, and preparation method and application thereof
  • Vanadate upconversion material fluorescent powder, and preparation method and application thereof
  • Vanadate upconversion material fluorescent powder, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Y 0.89 VO 4 :0.01Tm 3+ / 0.1Yb 3+ Phosphor powder preparation

[0020] Weigh yttrium oxide (YVO 4 )0.5036g, vanadium pentoxide (V 2 o 5 )0.4547g, thulium oxide (Tm 2 o 3 ) 0.0096g, ytterbium oxide (Yb 2 o 3 ) 0.0985g, after grinding and mixing the above raw materials in an agate mortar, put them into a corundum crucible, pre-fire at 650°C (increase the temperature to 650°C at a constant speed of 1.5 hours), keep the temperature at 650°C for 6 hours, cool, take out and grind ; Then sinter at 1200°C for 3 hours (that is, heat up to 1200°C at a rate of 400°C / hour), and keep the temperature at 1200°C for 6 hours; after cooling, grind again, crush and sieve, and finally obtain the sample. The up-conversion spectrum of the sample under 980nm excitation with a power of 0.39mw is as follows figure 2 As shown, strong blue upconversion luminescence (0.1233, 0.1038) was observed.

Embodiment 2

[0021] Example 2: Y 0.888 VO 4 :0.01Tm 3+ / 0.002Er 3+ / 0.1Yb 3+ Phosphor powder preparation

[0022] Weigh yttrium oxide (YVO 4 )0.5069g, vanadium pentoxide (V 2 o 5 )0.4547g, thulium oxide (Tm 2 o 3 ) 0.0096g, erbium oxide (Er 2 o 3 ) 0.0019g, ytterbium oxide (Yb 2 o 3 ) 0.0985g, after grinding and mixing the above raw materials in an agate mortar, put them into a corundum crucible, pre-fire at 650°C (increase the temperature to 650°C at a constant speed of 1.5 hours), keep the temperature at 650°C for 6 hours; cool, take out and grind ; Sinter at 1200°C for 3 hours (that is, heat up to 1200°C at a rate of 400°C / hour), and keep the temperature at 1200°C for 6 hours; after cooling, grind again evenly, crush and sieve, and finally obtain the sample. The up-conversion spectrum of the sample under 980nm excitation with a power of 0.39mw is as follows image 3 As shown, strong green upconversion luminescence (0.2450, 0.7276) was observed.

Embodiment 3

[0023] Example 3: Y 0.887 VO 4 :0.01Tm 3+ / 0.003Ho 3+ / 0.1Yb 3+ Phosphor powder preparation

[0024] Weigh yttrium oxide (YVO 4 )0.5069g, vanadium pentoxide (V 2 o 5 )0.4547g, thulium oxide (Tm 2 o 3 ) 0.0096g, holmium oxide (Ho 2 o 3 ) 0.0029g, ytterbium oxide (Yb 2 o 3 ) 0.0985g, after grinding and mixing the above raw materials in an agate mortar, put them into a corundum crucible, pre-fire at 650°C (increase the temperature to 650°C at a constant speed of 1.5 hours), keep the temperature at 650°C for 6 hours; cool, take out and grind ; Sinter at 1200°C for 3 hours (that is, heat up to 1200°C at a rate of 400°C / hour), and keep the temperature at 1200°C for 6 hours; after cooling, grind again evenly, crush and sieve, and finally obtain the sample. The up-conversion spectrum of the sample under 980nm excitation with a power of 0.39mw is as follows Figure 4 As shown, a strong pink upconversion luminescence (0.3403, 0.2408) was observed.

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Abstract

The invention discloses vanadate upconversion material fluorescent powder, and a preparation method and application thereof. The vanadate upconversion material fluorescent powder has a chemical composition formula Y0.89-x-yVO4:0.01Tm<3+> / xEr<3+> / yHo<3+> / 0.1Yb<3+>, wherein x is 0 to 0.002, and y is 0 to 0.003. The invention also discloses the preparation method for the material, and the preparation method comprises the following steps of: weighing yttrium oxide, vanadium pentoxide, thulium oxide, holmium oxide, erbium oxide and ytterbium oxide in a molar ratio of the chemical composition formula, grinding and mixing uniformly, pre-sintering at the temperature of 650 DEG C, and keeping constant temperature of 650 DEG C for six hours; cooling, grinding again, sintering at the temperature of 1,200 DEG C, and keeping the constant temperature of 1,200 DEG C for six hours; and cooling to obtain the vanadate upconversion material fluorescent powder. The vanadate upconversion material fluorescent powder is high in luminous efficiency and stability and meets the requirement of a white light light-emitting diode (LED).

Description

technical field [0001] The invention relates to a vanadate up-conversion material fluorescent powder, a preparation method and application thereof. Background technique [0002] At present, the technology of realizing white light LED can be divided into three types. One is to assemble red, green and blue three primary color LED chips together to realize white light. However, due to the temperature rise of different LED devices, the degree of luminous brightness decline varies greatly. , the result is the drift of the color coordinates of the mixed white light. The second is to use the blue LED chip to excite the yellow-emitting YAG:Ce phosphor, and the combination of blue light and yellow light to obtain white light. Due to the lack of red spectral components in this white light, the light source The color rendering index is low. The third is to use the near-ultraviolet light emitted by the near-ultraviolet LED chip to excite the three primary color phosphors to obtain whit...

Claims

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Application Information

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IPC IPC(8): C09K11/82H01L33/50
CPCY02B20/181Y02B20/00
Inventor 孙家跃杜海燕朱吉成
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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