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Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof

A luminescent material, a technology of red luminescence, applied in luminescent materials, chemical instruments and methods, the use of gas discharge lamps, etc., can solve the problems of weak luminous intensity and complex synthesis process

Inactive Publication Date: 2011-03-02
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing rare earth-activated red luminescent materials such as Ca 2 Si 5 N 8 :Eu 2+ 、CaAlSrN 3 :Eu 2+ , CaS:Eu 2+ The complex synthesis process, weak luminous intensity and other factors affect its wide application

Method used

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  • Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof
  • Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof
  • Rare earth phosphor red luminous material for converting purple light emitting diode (LED) to white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] ①Material selection according to the chemical structure formula M 3-a-b-c NSi 2 o 8 :R a ·S b ·T c , when M is Ba element, N is Mg element, R is Mn element, S is Eu element, and T is Tb element, take the following high-purity materials by weight percentage:

[0020] BaCO 3 : 73.35% MgO: 5.33%

[0021] SiO 2 : 16.07% MnCl 2 4H 2 O: 2.66%

[0022] Eu 2 o 3 : 2.34% Tb 4 o 7 : 0.25%

[0023] ② After grinding and mixing the above-mentioned weighed materials evenly, put them into a small alumina crucible (30ml) and add a cover, put the small crucible into a large crucible (60ml), bury the small crucible with activated carbon and add a cover, such as attached figure 1 Shown: Then put it into a high-temperature furnace for calcination at 1300°C for 2 hours.

[0024] ③ After cooling, take it out and grind it, then put it into a small alumina crucible and cover it, put the small crucible into a large crucible, bury the small crucible with activated carbon and cov...

example 2

[0026] ①Material selection according to the chemical structure formula M 3-a-b-c NSi 2 o 8 :R a ·S b ·T c , when M is Ba element, N is Mg element, R is Mn element, S is Eu element, and T is Tb element, take the following high-purity materials by weight percentage:

[0027] BaCO 3 : 73.81% MgO: 5.33%

[0028] SiO 2 : 16.07% MnCl 2 4H 2 O: 2.66%

[0029] Eu 2 o 3 : 1.88% Tb 4 o 7 : 0.25%

[0030] ② After grinding and mixing the above-mentioned weighed materials evenly, put them into a small alumina crucible (30ml) and add a cover, put the small crucible into a large crucible (60ml), bury the small crucible with activated carbon and add a cover, such as attached figure 1 Shown: Then put it into a high-temperature furnace for calcination at 1350°C for 1.5 hours.

[0031] ③ After cooling, take it out and grind it, then put it into a small alumina crucible and cover it, put the small crucible into a large crucible, bury the small crucible with activated carbon and c...

example 3

[0033] ①Material selection according to the chemical structure formula M 3-a-b-c NSi 2 o 8 :R a ·S b ·T c , when M is Ba element, N is Mg element, R is Mn element, S is Eu element, and T is Tb element, take the following high-purity materials by weight percentage:

[0034] BaCO 3 : 72.84% MgO: 5.33%

[0035] SiO 2 : 16.09% MnCl 2 4H 2 O: 2.67%

[0036] Eu 2 o 3 : 2.82% Tb 4 o 7 : 0.25%

[0037] ② After grinding and mixing the above-mentioned weighed materials evenly, put them into a small alumina crucible (30ml) and add a cover, put the small crucible into a large crucible (60ml), bury the small crucible with activated carbon and add a cover, such as attached Figure 1 Shown: Then put it into a high-temperature furnace for calcination at 1250°C for 2.5 hours.

[0038] ③ After cooling, take it out and grind it, then put it into a small alumina crucible and cover it, put the small crucible into a large crucible, bury the small crucible with activated carbon and co...

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Abstract

The invention belongs to the technical field of luminescence and display, relating to a red luminous material in a novel rare earth phosphor luminous material for converting a purple light emitting diode (LED) to a white LED. The structure formula of the red luminous material is M[3-a-b-c]NSi2O8:Ra.Sb.Tc, when M is metal element Ba, N is metal element Mg, R is transition metal element Mn, S is rare earth element Eu and T is rare earth element Tb, MnCl2.4H2O is an activating agent and a fluxing agent in the reaction, thus reducing the reaction temperature, shortening the reaction time, lowering phonon energy in substrate lattice and improving the luminous efficiency. The preparation method comprises the following steps: weighting the materials with the structure formula by weight percent, evenly grinding, placing and calcining the ground material in a high-temperature furnace, cooling, porphyrizing, calcining at high temperature again, and porphyrizing again after cooling, thus obtaining the product. The red luminous material is mixed with a silicate rare earth luminous material capable of emitting blue light and green light in proportion to be coated on the core of the purple LED so as to emit white light.

Description

technical field [0001] The invention belongs to the technical field of light emission and display, and relates to a rare-earth red light-emitting material that can be converted into white light by exciting a three-primary-color light-emitting material with a purple light LED and a preparation method thereof. Background technique [0002] Due to its small size (can cooperate with the miniaturization of application equipment), low power consumption (one-eighth to one-tenth of incandescent lamp), long life (up to 100,000 hours or more), low heat generation ( Low heat radiation) and good response speed (high-frequency operation) have attracted widespread attention from all over the world. At present, commercial white LEDs use blue LED chips to excite yellow phosphors to produce white light, but due to the lack of red light in the spectrum, the color rendering is not high, and it is difficult to meet the requirements of low color temperature lighting. Violet LEDs that excite tri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79C09K11/59
CPCY02B20/181Y02B20/00
Inventor 张昕彤刘益春赵成久戴鹏鹏赵海辉
Owner NORTHEAST NORMAL UNIVERSITY
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