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Single-phase white light fluorescent powder based on ultraviolet light-emitting diode (LED) excitation and production method thereof as well as luminescent device

A technology of light-emitting devices and phosphors, applied in the direction of light-emitting materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of difficulty in obtaining low color temperature and few types of systems, and achieve the convenience of large-scale production, large-scale composition selection and room for adjustment , The manufacturing method is simple and feasible

Inactive Publication Date: 2013-07-24
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the types of phosphors that have been released so far, there are few types of systems, it is difficult to obtain low color temperature, and there is room for further improvement of luminous intensity.

Method used

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  • Single-phase white light fluorescent powder based on ultraviolet light-emitting diode (LED) excitation and production method thereof as well as luminescent device
  • Single-phase white light fluorescent powder based on ultraviolet light-emitting diode (LED) excitation and production method thereof as well as luminescent device
  • Single-phase white light fluorescent powder based on ultraviolet light-emitting diode (LED) excitation and production method thereof as well as luminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Weighing BaCO 3 1.3025g, SiO 2 0.4006g, Lu 2 o 3 1.3266g, Eu 2 o 3 0.0117g, BaCO 3 , SiO 2 All were analytically pure, Lu 2 o 3 、Eu 2 o 3 The purity is 4N and above. After the above raw materials are mixed and ground evenly, they are mixed and ground at 1100-1500°C under a carbon reducing atmosphere or H 2 or N 2 / H 2 Calcined for 3-5 hours under reducing atmosphere, ground after natural cooling, washed the product three times with water, filtered, and dried at 120°C to obtain the composition Ba 1.98 Lu 2 Si 2 o 9 : 0.12Eu 2+ (ie a=0.12, b=0). Its excitation spectrum has a wide excitation peak, and the excitation effect of light with a wavelength in the range of 250nm-410nm is better, so it is suitable for ultraviolet light LED chips and the like. Its color coordinates are (0.2331, 0.2440), and it emits blue-white light.

Embodiment 2- Embodiment 6

[0031] Except for weighing the raw materials according to the chemical formula composition and stoichiometry of each embodiment in Table 1, the rest of the manufacturing steps are the same as in Example 1, and the chemical composition, color coordinates, and relative brightness are shown in Table 1.

[0032] Table 1 Chemical formula and its color coordinates and relative brightness of Examples 1-14

[0033] Example chemical formula Color coordinates (x,y) relative brightness 1 Ba 1.98 Lu 2 Si 2 o 9 : 0.02Eu 2+ 0.2331,0.2440 1.009 2 Ba 1.96 Lu 2 Si 2 o 9 : 0.04Eu 2+ 0.2233,0.2214 1.124 3 Ba 1.94 Lu 2 Si 2 o 9 : 0.06Eu 2+ 0.2149,0.2118 1.279 4 Ba 1.92 Lu 2 Si 2 o 9 : 0.08Eu 2+ 0.2226,0.2229 1.109 5 Ba 1.9 Lu 2 Si 2 o 9 : 0.10Eu 2+ 0.2352,0.2298 1.108 6 Ba 1.88 Lu 2 Si 2 o 9 : 0.12Eu 2+ 0.2411,0.2592 0.980

Embodiment 7

[0034] Example 7: BaCO 3 1.2663g, SiO 2 0.4006g, Lu 2 o 3 1.3266g, Eu 2 o 3 0.0352g, MnCO 3 0.0057 g, MnCO 3 For analytical purity. At 1100 ~ 1500 ° C in a carbon reducing atmosphere or H 2 or N 2 / H 2 Under a reducing atmosphere, roast for 3 to 5 hours, cool naturally and then grind, wash the product 3 times with water, filter, and dry at 120°C to obtain the chemical formula Ba 1.925 Lu 2 Si 2 o 9 : 0.06Eu 2+ ,0.015Mn 2+ (ie a=0.06, b=0.015) phosphor. Its excitation spectrum has a wide excitation peak, and the excitation effect of light with a wavelength in the range of 250nm-410nm is better, so it is suitable for ultraviolet light LED chips and the like. Its color coordinates x=0.2598, y=0.2297; excitation and emission spectra see figure 1 and figure 2 .

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Abstract

The invention relates to a single-phase white light fluorescent powder based on ultraviolet light-emitting diode (LED) excitation and a production method thereof as well as a luminescent device. The chemical formula of the fluorescent powder is Ba (2-x-y-z-a-b) CaxSryMgzLu2-m-n-pYmLanGdSi2O9: aEu<2+>, bMn<2+>, wherein x is large than or equal to 0 and less than or equal to 0.3, y is large than orequal to 0 and less than or equal to 0.1, z is large than or equal to 0 and less than or equal to 0.2, m is large than or equal to 0 and less than or equal to 0.2, n is large than or equal to 0 and less than or equal to 0.2, p is large than or equal to 0 and less than or equal to 0.2, a is large than 0 and less than or equal to 0.14, and b is large than or equal to 0 and less than or equal to 0.05. The preparation method comprises the following steps: grinding and mixing the raw materials; and roasting at high temperature at the reduction atmosphere; and then processing so as to obtain the fluorescent powder. The fluorescent powder has the characteristics of good chemical stability, wide excitation wave band, high luminous intensity, simple production method, no pollution, low cost and the like; and the emission wave length can be regulated according to requirement. A white light LED can be prepared by using an ultraviolet LED chip and the fluorescent powder provided by the invention,and a warm-toned light-regulating source can be produced.

Description

technical field [0001] The invention relates to a single-phase white light fluorescent powder excited by ultraviolet LEDs, a manufacturing method thereof and a light-emitting device. technical background [0002] In recent years, the global energy shortage and environmental pollution problems have become increasingly prominent. People are eager to apply new technologies for energy saving and environmental protection. Semiconductor lighting is a new technology with this charm. White light LED is the basis of semiconductor lighting application and the focus of industrial development. As a new type of lighting device, it has high efficiency and energy saving (more than 80% energy saving compared with traditional light sources for the same lighting effect), long life (actually up to 20,000 hours), no Mercury pollution, planar packaging and many other incomparable advantages of other light sources have been widely used in indicator lights, signal lights, mobile communication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/50
CPCY02B20/181Y02B20/00
Inventor 叶信宇杨幼明廖春发郭艳伟蔡裕发于会杰朱锋李林薛延都
Owner JIANGXI UNIV OF SCI & TECH