Green light-emitting fluorescent powder and preparation method thereof

A phosphor and green technology, applied in the field of green luminescent phosphor and its preparation, can solve the problems of intolerant ultraviolet radiation, demanding synthesis conditions and high synthesis temperature, and achieve the effects of energy saving, low preparation temperature and simple operation

Inactive Publication Date: 2010-06-09
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the rare earth phosphor of sulfide matrix is ​​not only not resistant to ultraviolet radiation, but also requires harsh synthesis conditions, so it is limited in practical application; although the rare earth phosphor of aluminate matrix is ​​stable, its synthesis temperature is very high, so it cannot Conducive to energy saving

Method used

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  • Green light-emitting fluorescent powder and preparation method thereof
  • Green light-emitting fluorescent powder and preparation method thereof
  • Green light-emitting fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1Ca 0.90 Tb 0.05 Na 0.05 O Green Luminescent Phosphor Powder

[0029] Weigh calcium carbonate CaCO 3 0.9008g, terbium oxide Tb 4 o 7 0.0935g, boric acid H 3 BO 3 0.1021g (10%) and sodium carbonate Na 2 CO 3 0.0265g. After the above-mentioned substances are fully ground in an agate mortar, they are put into a corundum crucible, and the volume ratio is 95:5 N 2 and H 2 Calcined at 900°C for 5 hours in a reducing atmosphere formed by a mixed gas, cooled naturally to room temperature, and ground to obtain white powder Ca 0.90 Tb 0.05 Na 0.05 O green luminescent phosphor.

[0030] Ca prepared in this example 0.90 Tb 0.05 Na 0.05 The excitation spectrum of O green luminescent phosphor is as followsfigure 1 As shown in 11, the emission spectrum is as figure 2 As shown in 21, it can be seen that the green luminescent material of this embodiment has a very high luminous intensity when excited by the excitation light with a wavelength of 172nm.

Embodiment 2

[0031] Example 2Ca 0.86 Gd 0.02 Tb 0.05 Na 0.07 O Green Luminescent Phosphor Powder

[0032] Weigh calcium carbonate CaCO 3 0.8608g, terbium oxide Tb 4 o 7 0.0935g, boric acid H 3 BO 3 0.1028g (10%), sodium carbonate Na 2 CO 3 0.0371g and gadolinium oxide Gd 2 o 3 0.0363g. After the above-mentioned substances are fully ground in an agate mortar, they are put into a corundum crucible, and the volume ratio is 95:5 N 2 and H 2 Calcined at 900°C for 5 hours in a reducing atmosphere formed by a mixed gas, cooled naturally to room temperature, and ground to obtain white powder Ca 0.86 Gd 0.02 Tb 0.05 Na 0.07 O green luminescent phosphor.

[0033] Ca prepared in this example 0.86 Gd 0.02 Tb 0.05 Na 0.07 The excitation spectrum of O green luminescent phosphor is as follows figure 1 As shown in 12, the emission spectrum is as figure 2 As shown in 22, it can be seen that the green luminescent material of this embodiment has a very high luminous intensity when ex...

Embodiment 3

[0034] Example 3Ca 0.76 Gd 0.02 Tb 0.10 Na 0.12 O Green Luminescent Phosphor Powder

[0035] Weigh calcium carbonate CaCO 3 0.7607g, terbium oxide Tb 4 o 7 0.1870g, boric acid H 3 BO 3 0.1048g (10%), sodium carbonate Na 2 CO 3 0.0636g and gadolinium oxide Gd 2 o 3 0.0363g. After the above-mentioned substances are fully ground in an agate mortar, they are put into a corundum crucible, and the volume ratio is 95:5 N 2 and H 2 Calcined at 1000°C for 5 hours in a reducing atmosphere formed by a mixed gas, naturally cooled to room temperature, ground, and then calcined at 900°C for 5 hours, naturally cooled to room temperature, ground to obtain white powder Ca 0.76 Gd 0.02 Tb 0.10 Na 0.12 O green luminescent phosphor.

[0036] image 3 Is the Ca prepared in this example 0.76 Gd 0.02 Tb 0.10 Na 0.12 Afterglow lifetime diagram of O green luminescent phosphor, such as image 3 As shown, the afterglow life τ = 2.4807ms, the afterglow time is short, which is bene...

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Abstract

The invention relates to a green light-emitting fluorescent powder, which is characterized in that the chemical formula thereof is M1-x-yRexNyO, wherein M is at least one of Ca, Sr and Ba; Re is at least one of Tb and Gd; N is Li, Na or K; the value of x is more than or equal to 0.001 and less than or equal to 0.3; and the value of y is more than or equal to 0 and less than or equal to 0.3. The preparation method comprises the following steps: weighing raw materials and fluxing agents in proportion; grinding and uniformly mixing the raw materials and the fluxing agents; roasting the mixture at the temperature of between 850 DEG C and 1,300 DEG C in reducing atmosphere for 1 to 24 hours for one to three times; and grinding the roasted mixture after cooling to obtain the green light-emitting fluorescent powder. The green light-emitting fluorescent powder has the advantages of simple preparation method, no pollution, contribution to industrialized production, short afterglow time, high luminous intensity and excellent luminous performance, can be widely used in PDP or mercury-free fluorescent lamps.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a fluorescent powder and a preparation method thereof, more specifically, to a green luminescent fluorescent powder which can be excited by vacuum ultraviolet light and a preparation method thereof. Background technique [0002] In recent years, with people's in-depth research on xenon (Xe), the technology for generating vacuum ultraviolet light has been quite mature, and the electro-optical conversion rate is close to 60%. In order to better use 172nm light in the field of lighting and display, efficient and stable red, green and blue phosphors are needed. At present, the green light-emitting phosphors in commercial phosphors are mainly Zn 2 SiO 4 :Mn 2+ and BaAl 12 o 19 :Mn 2+ , whose Mn 2+ As luminescent centers, however, due to the Mn 2+ spin-forbidden transition 4 T 1 → 6 A 1 It will cause the afterglow time to be too long, which is not conducive to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 周明杰刘军梁小芳廖秋荣
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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