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Green luminescent material and preparation method thereof

A luminescent material and green technology, applied in the field of green luminescent materials and their preparation, can solve the problems of long afterglow time, unfavorable dynamic picture display, decrease in luminous intensity, etc., and achieve improved luminous performance, good vacuum ultraviolet absorption capacity, good luminous intensity Effect

Inactive Publication Date: 2010-06-23
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

However, the green luminescent material Zn 2 SiO 4 :Mn 2+ and BaAl 12 o 19 :Mn 2+ Take Mn 2+ is the luminescent center, due to the Mn 2+ spin-forbidden transition 4 T 1 → 6 A 1 The afterglow time is too long, which is not conducive to the display of dynamic pictures
Although it is possible to increase the Mn 2+ The doping concentration of ions reduces the afterglow time, but the luminous intensity also drops sharply

Method used

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  • Green luminescent material and preparation method thereof
  • Green luminescent material and preparation method thereof
  • Green luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1Ca 0.76 Gd 0.02 Tb 0.10 Na 0.12 Al 2 B 2 o 7 Green luminescent material

[0031] Weigh calcium carbonate CaCO 3 0.3803g, aluminum hydroxide Al(OH) 3 0.7800g, boric acid H 3 BO 3 0.7419g (20% excess), sodium carbonate Na 2 CO 3 0.0318g, terbium oxide Tb 4 o 7 0.0934g and gadolinium oxide Gd 2 o 3 0.0181g. After fully grinding all the above-mentioned raw materials in an agate mortar, put them into a corundum crucible for pre-sintering at 500°C for 2 hours, then cool naturally to room temperature, and grind again. Finally, at a volume ratio of 95:5 N 2 and H 2 In the reducing atmosphere formed by the mixed gas, the fully ground pre-sintered product was calcined at 900 ° C for 10 h, cooled naturally to room temperature, and white powder Ca was obtained after grinding. 0.76 Gd 0.02 Tb 0.10 Na 0.12 Al 2 B 2 o 7 Green luminescent material.

Embodiment 2

[0032] Example 2Sr 0.76 Gd 0.02 Tb 0.10 Na 0.12 Al 2 B 2 o 7 Green luminescent material

[0033] Weigh strontium carbonate SrCO 3 0.5610g, aluminum hydroxide Al(OH) 3 0.7800g, boric acid H 3 BO 3 0.7419g (20% excess), sodium carbonate Na 2 CO 3 0.0318g, terbium oxide Tb 4 o 7 0.0934g and gadolinium oxide Gd 2 o 3 0.0181g. After fully grinding all the above-mentioned raw materials in an agate mortar, put them into a corundum crucible for pre-sintering at 500°C for 2 hours, then cool naturally to room temperature, and grind again. Finally, at a volume ratio of 95:5 N 2 and H 2 In the reducing atmosphere formed by the mixed gas, the fully ground pre-sintered product was calcined at 960 ° C for 10 h, and naturally cooled to room temperature. After grinding, the white powder Sr 0.76 Gd 0.02 Tb 0.10 Na 0.12 Al 2 B 2 o 7 Green luminescent material.

[0034] The Sr prepared in this embodiment 0.76 Gd 0.02 Tb 0.10 Na 0.12 Al 2 B 2 o 7 The emission spect...

Embodiment 3

[0035] Example 3Sr 0.76 Gd 0.02 Tb 0.10 Li 0.12 Al 2 B 2 o 7 Green luminescent material

[0036] Weigh strontium carbonate SrCO 3 0.5610g, aluminum hydroxide Al(OH) 3 0.7800g, boric acid H 3 BO 3 0.7419g (20% excess), lithium carbonate Li 2 CO 3 0.0221g, terbium oxide Tb 4 o 7 0.0934g and gadolinium oxide Gd 2 o 3 0.0181g. After fully grinding all the above-mentioned raw materials in an agate mortar, put them into a corundum crucible for pre-sintering at 500°C for 2 hours, then cool naturally to room temperature, and grind again. Finally, in H 2 In the reducing atmosphere formed, the fully ground pre-sintered product was calcined at 960 °C for 10 h, cooled to room temperature naturally, and white powder Sr was obtained after grinding. 0.76 Gd 0.02 Tb 0.10 Li 0.12 Al 2 B 2 o 7 Green luminescent material.

[0037] The Sr prepared in this embodiment 0.76 Gd 0.02 Tb 0.10 Li 0.12 Al 2 B 2 o 7 The emission spectra of green luminescent materials under ...

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Abstract

The invention relates to a green luminescent material and a preparation method thereof. The green luminescent material adopts a chemical formula of M1-x-y-zGdxTbyNzAl2B2O7, wherein M is at least one component among Ca, Sr and Ba, N is Li, Na and K, the value range of x meets the relationship, i.e., 0.02 Less than or equal x Less than or equal 0.3, the value range of y meets the relationship, i.e., 0.01 Less than or equal y Less than or equal 0.4, z=x+y, and 1-x-y-z>0. The preparation method comprises the following steps: weighing all the raw materials according to the proportion, then fully grinding the raw materials, presintering the ground raw materials at the lower temperature, calcining for 2 to 12 h at the temperature of 800-1200 DEG C under the reducing atmosphere, and then grinding after cooling to obtain the green luminescent material. The preparation method is simple, pollution-free and is beneficial to industrialized production; and the obtained green luminescent material is short in afterglow time and high in luminous intensity, has the excellent luminous performance and can be widely used for a PDP or mercury-free fluorescent lamp.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and more specifically relates to a green luminescent material and a preparation method thereof. Background technique [0002] In recent years, with the development of color plasma flat panel display (Plasma Display Panel, hereinafter referred to as PDP) technology and the increasing emphasis on environmental protection, the development of mercury-free light sources has become one of the key areas of research. Among them, the development of efficient and stable red Green, blue and three-color luminescent materials are one of the key technologies to solve the main problems in this field. [0003] At present, commercial luminescent materials mainly include red luminescent material Y 2 o 3 :Eu 3+ , (Y, Gd)BO 3 :Eu 3+ , the green luminescent material Zn 2 SiO 4 :Mn 2+ 、BaAl 12 o 19 :Mn 2+ and blue luminescent material Y 2 SiO 5 : Ce 3+ 、LaPO 4 :Tm 3+ 、BaMgAl 10 o 17 :Eu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 周明杰刘军梁小芳廖秋荣
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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