Unlock instant, AI-driven research and patent intelligence for your innovation.

Emitting color-adjustable tungstate fluorescent powder and preparation method thereof

A technology of luminous color and tungstate, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low color temperature, high price, and low color rendering index of phosphors, and improve quantum efficiency and overall luminous intensity , enhanced luminous intensity, good chemical stability

Inactive Publication Date: 2018-03-20
XUZHOU NORMAL UNIVERSITY
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the red phosphor system is single, and the currently commercialized red phosphor is mainly Y 2 o 2 S:Eu 3+
Compared with blue and green phosphors, Y 2 o 2 S:Eu 3+ Phosphor powder has the following outstanding defects: expensive; cannot effectively absorb excitation light around 400nm; luminous brightness is less than 1 / 8 of commercial blue and green phosphors; chemical properties are unstable; service life is short, which greatly limits its application
[0005] At present, the production process of commercial phosphors is relatively mature, but there are still the following defects: ① Short-wavelength blue light excites phosphors to produce long-wavelength yellow light, which causes energy loss and reduces LED efficiency; ② Due to the lack of red light, it is difficult to achieve low The color temperature makes the phosphor color rendering index low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 prepares CaGd 0.98 (WO 4 ) 4 :0.49Tb 3+ ,0.02Eu 3+

[0023] According to the chemical formula CaGd 0.98 (WO 4 ) 4 :0.49Tb 3+ ,0.02Eu 3+ The stoichiometric ratio of each element in the above-mentioned analytically pure CaCO was weighed 3 2.227g, (NH 4 ) 10 h 2 (W 2 o 7 ) 6 22.712g, Gd 2 o 3 4.033g, Tb(NO 3 ) 3 ·6H 2 O10.08g and Eu 2 o 3 0.08g; put the weighed raw material in an agate mortar and grind for 30min to make it fully mixed; put the ground mixture in an alumina crucible, and perform high-temperature calcination in an air atmosphere at a temperature of 1000°C. The time is 4 hours; after the product is cooled to room temperature, take it out, and grind it into powder with an agate mortar to obtain the desired phosphor.

[0024] The prepared phosphor powder sample was tested by fluorescence spectrum (FL3-221, HOROBA, Jobin Yvon, France), and the emission peaks of the powder were mainly located at 545nm and 616nm under near-ultrav...

Embodiment 2

[0025] Embodiment 2 prepares CaGd 0.9 (WO 4 ) 4 :0.45Tb 3+ ,0.1Eu 3+

[0026] According to the chemical formula CaGd 0.9 (WO 4 ) 4 :0.45Tb 3+ ,0.1Eu 3+ The stoichiometric ratio of each element in the above-mentioned analytically pure CaCO was weighed 3 2.227g, (NH 4 ) 10 h2 (W 2 o 7 ) 6 22.712g, Ga(NO 3 ) 3 ·6H 2 O9.027g, Tb(NO 3 ) 3 ·6H 2 O10.08g and Eu(NO 3 ) 3 ·6H 2 O 0.994g; The raw material that weighs is placed in agate mortar and grinds 35min, makes it fully mix; The mixture that is ground is placed in alumina crucible, carries out high-temperature calcining under air atmosphere, and calcining temperature is 1100 ℃, The calcination time is 4.5 hours; after the product is cooled to room temperature, take it out, and grind it into powder with an agate mortar to obtain the desired phosphor.

[0027] The prepared phosphor powder sample was tested by fluorescence spectrum (FL3-221, HOROBA, Jobin Yvon, France), and the emission peaks of the powder we...

Embodiment 3

[0028] Embodiment 3 prepares CaGd 0.8 (WO 4 ) 4 :0.4Tb 3+ ,0.2Eu 3+

[0029] According to the chemical formula CaGd 0.8 (WO 4 ) 4 :0.4Tb 3+ ,0.2Eu 3+ The stoichiometric ratio of each element in the above-mentioned analytically pure CaCO was weighed 3 2.227g, (NH 4 ) 10 h 2 (W 2 o 7 ) 6 22.723g, Gd 2 o 3 3.231g, Tb(NO 3 ) 3 ·6H 2 O10.09g and Eu(NO 3 ) 3 ·6H 2 O 1.987g; The raw material that weighs is placed in the agate mortar and grinds 40min, makes it fully mix; The mixture that is ground is placed in the alumina crucible, carries out high-temperature calcining under air atmosphere, and calcining temperature is 1200 ℃, The calcination time is 4.5 hours; after the product is cooled to room temperature, take it out, and grind it into powder with an agate mortar to obtain the desired phosphor.

[0030] The prepared phosphor powder sample was tested by fluorescence spectrum (FL3-221, HOROBA, Jobin Yvon, France), and the emission peak of the powder was main...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses emitting color-adjustable tungstate fluorescent powder and a preparation method thereof. The fluorescent powder is prepared by the following steps: codoping and compounding tungstate as a matrix material with trivalent terbium ions and europium ions, wherein the chemical constitution general formulae of the trivalent terbium ions and the europium ions are respectively CaGd2(1-x-y)(WO4)4:xTb<3+> and yEu<3+>, x is the mole percent of a Tb<3+> doped Gd<3+> site, y is the mole percent of a Eu<3+> doped Gd<3+> site, x is more than or equal to 0 and less than or equal to 0.5,and y is more than or equal to 0 and less than or equal to 0.5; and preparing the fluorescent powder by virtue of a high-temperature solid-phase method. The tungstate fluorescent powder can be efficiently stimulated, and a Gd<3+> ion site is replaced by virtue of Tb<3+> or Eu<3+>, so that the color of a luminescence spectrum can be adjusted from yellow to red, the chemical stability is good, andthe color rendering index is high. The preparation process of the tungstate fluorescent powder is simple, low in cost, applicable to industrial production and environmentally friendly, and industrial''three wastes'' are not generated in the reaction process.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a tungstate fluorescent powder, in particular to a tungstate fluorescent powder with adjustable luminescent color and a preparation method thereof. Background technique [0002] As a new type of solid-state lighting device, white light-emitting diodes (LEDs) have been widely used in flat panel display, road lighting and other fields due to their advantages of energy saving, high efficiency, small size, no pollution and planarization. [0003] At present, white light LED mainly uses the combination of InGaN chip (370-410nm) and three primary color phosphors (red, green, blue) to emit white light. The white light emitted by this system is only composed of the light emitted by the phosphor, without the participation of the light emitted by the LED chip, which can reduce the drift of the white light point over time. Among them, the red phosphor system is singl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K11/78
CPCC09K11/7794
Inventor 张乐吴佳东贲玥魏帅高光珍王骋陈浩
Owner XUZHOU NORMAL UNIVERSITY