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A kind of red fluorescent material for white light LED and preparation method thereof

A technology for red fluorescent and luminescent materials, applied in luminescent materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of complex preparation methods, poor color reproduction, lack of red light components, etc., and achieve good repeatability , The effect of pure chromaticity and low equipment requirements

Active Publication Date: 2016-09-07
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the white light LED commonly used in the market is mainly realized by combining blue LED chips with YAG:Ce phosphor powder, and by exciting YAG:Ce to emit yellow light and mix blue light. However, due to the lack of red light components, its display The color index is relatively low, the color reproduction is poor, and the color temperature is relatively high
Among the many red phosphors for lamps, there are not many that are really practical. There are very few red phosphors that can be effectively excited by near-ultraviolet light. Red phosphors for ultraviolet white light LEDs are even more scarce; at the same time, most of the existing commercial phosphors are based on sulfides and halides, and the preparation methods of these materials are often complicated and not environmentally friendly. Therefore, the development of high-efficiency red phosphors with good comprehensive performance It has become a hot spot of research at home and abroad

Method used

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  • A kind of red fluorescent material for white light LED and preparation method thereof
  • A kind of red fluorescent material for white light LED and preparation method thereof
  • A kind of red fluorescent material for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Ba 2.7 Eu 0.3 MgSb 2 o 9 , according to the chemical formula Ba 2.7 Eu 0.3 MgSb 2 o 9 The stoichiometric ratio of each element in the formula is weighed separately from barium carbonate BaCO 3 : 1.3321 g, europium oxide Eu 2 o 3 : 0.1319 g, magnesium oxide MgO: 0.1008 g, antimony pentoxide Sb 2 o 5 : 0.8088g, ground in an agate mortar and mixed evenly, then pre-calcined in a muffle furnace at 850°C for 3 hours in an air atmosphere, cooled to room temperature naturally, and took out the sample; fully mixed and ground evenly, and placed in the muffle furnace again In the furnace, in the air atmosphere, calcined at 1400 ° C for 2 hours, cooled to room temperature naturally, and after taking it out, it was fully ground to obtain a powdery luminescent material.

[0035] See attached figure 1 , which is the X-ray powder diffraction pattern of the sample prepared by the technical scheme of this embodiment. The test results show that no other miscella...

Embodiment 2

[0041] Preparation of Ba 2.64 Eu 0.36 MgSb 2 o 9 , according to the chemical formula Ba 2.64 Eu 0.36 MgSb 2 o 9 The stoichiometric ratio of each element in the element, respectively weighed barium nitrate Ba (NO 3 ) 2 : 1.7248 g, europium oxide Eu 2 o 3 : 0.1584 g, magnesium carbonate basic 4MgCO 3 ·Mg(OH) 2 ·5H 2 O: 0.2429 g, antimony pentoxide Sb 2 o 5 : 0.8088 g, ground and mixed in an agate mortar, pre-calcined in an air atmosphere at 900 ° C for 2 hours in a muffle furnace, cooled to room temperature naturally, and took out the sample; fully mixed and ground evenly, placed in the muffle furnace again In the furnace, in the air atmosphere, calcined at 1500 ° C for 1 hour, cooled to room temperature naturally, and after taking it out, it was fully ground to obtain a powdery luminescent material.

[0042] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence decay ...

Embodiment 3

[0044] Preparation of Ba 2.55 Eu 0.45 MgSb 2 o 9 , according to the chemical formula Ba 2.55 Eu 0.45 MgSb 2 o 9 The stoichiometric ratio of each element in the formula is weighed separately for barium oxide BaO: 0.9775 grams, europium oxide Eu 2 o 3 : 0.1979 g, magnesium oxide MgO: 0.1008 g, antimony pentoxide Sb 2 o 5 : 0.8088g, ground in an agate mortar and mixed evenly, pre-calcined in a muffle furnace at 500°C for 16 hours in an air atmosphere, cooled naturally to room temperature, and took out the sample; fully mixed and ground evenly, and placed in the muffle furnace again In the furnace, in the air atmosphere, calcined at 900°C for 12 hours, cooled naturally to room temperature, and after taking it out, it was fully ground to obtain a powdery luminescent material.

[0045] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence decay curve.

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Abstract

The invention discloses a red fluorescent material for white LEDs. The chemical reaction of the red fluorescent material is Ba3-3xEu3xMgSb2O9, wherein x is the mole percentage of doped Eu<3+>, and x is not smaller than 0.0001 and not greater than 0.15. The above luminescent material is prepared by adopting novel antimonate as a matrix material through a high temperature solid phase method or a chemical synthesis method, and the red fluorescent material prepared in the invention can be excited by light with the wavelength of 250-470nm, and can emit red light with the dominant wavelength nearby 616nm. The above method has the advantages of cheap and easily available raw material s, simple and agile preparation process, low requirements on devices, great reduction of the production cost, suitableness for large scale production, energy saving and environmental protection; and the prepared fluorescent material has the advantages of high purity, good crystallinity, stable performances, excellent luminescence performance, strong visible light permeability, and wide application prospect in the LED illumination field.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a red fluorescent material for white LEDs and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] Since the 21st century, energy saving and environmental protection have been the topics of social and economic sustainable development. Compared with traditional energy-saving lamps, white LEDs are known as the green light source of the 21st century due to their advantages of high efficiency, energy saving, stable performance, long service life, and no pollution to the environment, and have become a hot research topic in the field of lighting. one. [0003] At present, the white light LED commonly used in the market is mainly realized by combining blue LED chips with YAG:Ce phosphor powder, and by exciting YAG:Ce to emit yellow light and mix blue light. However, due to the lack of red light c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/75
CPCY02B20/00Y02P20/10
Inventor 乔学斌
Owner 徐州博创建设发展集团有限公司
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