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Bismuth-doped vanadate fluorescent powder and preparation method thereof

A technology of vanadate and phosphor, applied in the field of bismuth-doped vanadate phosphor and its preparation, can solve the problems of weak luminescence, low color rendering index, lack of yellow phosphor, etc., and achieve the effect of avoiding saturation effect

Inactive Publication Date: 2013-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this kind of WLED is that it emits weak light in the red spectrum region, which directly leads to the high color temperature of commercial WLEDs (usually at 4500-6500K), and the low color rendering index (abbreviated as CRI below), usually less than 80
[0003] In addition, in addition to the above WLED preparation technology, WLED can also be prepared by combining ultraviolet LED chips with blue and yellow phosphors that can be excited by ultraviolet light. UV-WLED devices prepared using this idea have not been reported. largely due to the lack of yellow phosphors that can be excited by ultraviolet light

Method used

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  • Bismuth-doped vanadate fluorescent powder and preparation method thereof
  • Bismuth-doped vanadate fluorescent powder and preparation method thereof
  • Bismuth-doped vanadate fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Select yttrium oxide, lutetium oxide, scandium oxide, ammonium vanadate, bismuth oxide as starting compound raw materials, press Y a Lu b sc c VO 4 : The element molar ratio ratio shown in d%Bi, respectively weigh five kinds of compound raw materials, a total of 9 groups, the ratio is as follows:

[0029] (1) Y: Lu: Sc: V = 1: 0: 0: 1, corresponding to a = 1, b = 0, c = 0, bismuth replaces 2% of Y, that is, d% = 2%;

[0030] (2) Y: Lu: Sc: V = 0.8: 0.2: 0: 1, corresponding to a = 0.8, b = 0.2, c = 0, bismuth replaces 2% (Y, Lu), that is, d% = 2%;

[0031] (3) Y: Lu: Sc: V = 0.6: 0.4: 0: 1, corresponding to a = 0.6, b = 0.4, c = 0, bismuth replaces 2% (Y, Lu), that is, d% = 2%;

[0032] (4) Y: Lu: Sc: V = 0.4: 0.6: 0: 1, corresponding to a = 0.4, b = 0.6, c = 0, bismuth replaces 2% (Y, Lu), that is, d% = 2%;

[0033] (5) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 2% of Lu, that is, d% = 2%;

[0034] (6) Y: Lu: Sc: V = 0: 0.8: ...

Embodiment 2

[0044] Select yttrium nitrate, lutetium nitrate, scandium nitrate, vanadium oxide, bismuth powder as starting compound raw materials, press Y a Lu b sc c VO 4 : The element molar ratio ratio shown in d%Bi, respectively weigh five kinds of compound raw materials, a total of 7 groups, the ratio is as follows:

[0045] (1) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 0.01% of Lu, that is, d% = 0.01%;

[0046] (2) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 1.00% of Lu, that is, d% = 1.00%;

[0047] (3) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 2.00% of Lu, that is, d% = 2.00%;

[0048] (4) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 3.00% of Lu, that is, d% = 3.00%;

[0049] (5) Y: Lu: Sc: V = 0: 1: 0: 1, corresponding to a = 0, b = 1, c = 0, bismuth replaces 5.00% of Lu, that is, d% = 5.00%;

[0050] (6) Y: Lu: Sc: V = 0: ...

Embodiment 3

[0055] Select yttrium nitrate, lutetium nitrate, scandium nitrate, vanadium oxide, bismuth subcarbonate as starting compound raw materials, press Y a Lu b sc c VO 4 : The molar ratio of the elements shown in d%Bi, respectively weigh five kinds of compound raw materials, a total of 1 group, the specific ratio is as follows: Y:Lu:Sc:V=1:0:0:1, corresponding to a=1, b=0, c=0, bismuth replaces 2.00% of Y, that is, d%=2.00%; the total weight of the control mixture is 5 grams. After grinding and mixing 5 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Precisely controlling the heating rate, the sample was pre-fired at 500°C for 5 hours. Take out the pre-fired sample, grind and mix it again, put it into a crucible, burn it at 900°C for 15 hours under oxygen, take it out and grind it again, burn it at 900°C for 15 hours under oxygen, and cool it naturally with the furnace , that is, bismuth-doped fluoresce...

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Abstract

The invention discloses bismuth-doped vanadate fluorescent powder. An expression general formula of the bismuth-doped vanadate fluorescent powder is YaLubSccVO4: d%Bi; a crystal structure belongs to a tetragonal system, and an active ion is bismuth. The invention further discloses a preparation method of the fluorescent powder. The preparation method comprises the following steps: respectively weighing chemical raw materials containing yttrium, lutecium, scandium, vanadium and bismuth according to the element molar ratio expressed by the general formula, grinding and uniformly mixing, pre-sintering for 1-10 hours at 400-800 DEG C in the presence of oxidizing atmosphere, taking out, grinding and uniformly mixing, firing for 1-15 hours at 900-1500 DEG C in the presence of oxidizing atmosphere, taking out, grinding and uniformly mixing, and firing for 1-15 hours at 900-1500 DEG C in the presence of oxidizing atmosphere. The fluorescence peak of the fluorescent powder prepared by the invention is controllable and adjustable by changing the proportion of elements Y, Lu and Sc and changing the doping concentration of the Bi; and the fluorescent powder can be applied to the field of preparing a white light LED (light-emitting diode) apparatus through a combination scheme of an ultraviolet LED chip and the fluorescent powder.

Description

technical field [0001] The invention relates to luminescent materials, in particular to a bismuth-doped vanadate fluorescent powder and a preparation method thereof. Background technique [0002] At present, commercial white light LEDs (hereinafter referred to as WLEDs) use blue light InGaN LEDs to excite Y 3 Al 5 o 12 : Ce 3+ Yellow phosphor, yellow light mixed with transmitted blue light to produce white light. The disadvantage of this kind of WLED is that it emits weakly in the red spectral region, which directly leads to the high color temperature of commercial WLEDs (usually at 4500-6500K), and the low color rendering index (abbreviated as CRI below), usually less than 80. To solve this problem, a red phosphor (which can be excited by blue light) can be introduced into commercial WLEDs, or try to use an LED chip emitting 350-410nm ultraviolet light to excite red, blue and green three primary color mixed phosphors to make another phosphor. kinds of WLEDs. The CRI o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/82
Inventor 彭明营康逢文邱建荣
Owner SOUTH CHINA UNIV OF TECH
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