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LED red fluorescent material and its preparation method

A technology of red fluorescence and mixing materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of complex process, high price, high price of synthesis equipment, etc., and achieve the effect of wide range of raw materials and low cost

Active Publication Date: 2012-02-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nitride system LED red fluorescent material has high luminous efficiency and good thermal stability, but the synthesis conditions are harsh, usually requiring a high temperature of 1700-2100 °C and a high-pressure nitrogen environment, the synthesis equipment is expensive, the process is complicated, and the Ca / Sr used in the synthesis / Ba high-purity metals or metal nitrides are very expensive, which leads to the price of nitride system LED red fluorescent materials as high as 500,000-600,000 yuan / kg, much higher than the price of gold

Method used

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  • LED red fluorescent material and its preparation method
  • LED red fluorescent material and its preparation method
  • LED red fluorescent material and its preparation method

Examples

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Embodiment 1

[0051] The chemical formula of the red fluorescent powder applied to the white light LED in this embodiment is (Sr 0.9995 mn 0.0005 ) Al 4 o 7 , (Sr 0.9995 mn 0.0005 ) Al 2 o 4 , (Sr 0.9995 mn 0.0005 )Al 12 o 19 , (Sr 0.9995 mn 0.0005 ) 3 al 32 o 51 , (Sr 0.9995 mn 0.0005 ) 4 al 2 o 7 , (Sr 0.9995 mn 0.0005 ) 4 al 14 o 25 , (Sr 0.9995 mn 0.0005 ) 5 al 2 o 8 , (Sr 0.9995 mn 0.0005 ) 5 al 8 o 17 , (Sr 0.9995 mn 0.0005 ) 12 al 14 o 33 and (Sr 0.9995 mn 0.0005 ) 3 al 2 o 6 , a total of 10 samples.

[0052] The red fluorescent powder applied to white light LED in this embodiment is prepared according to the following method:

[0053] SrCO 3 、Al 2 (CO 3 ) 3 and MnCO 3 Be raw material and take batching according to the atomic proportion shown in the chemical formula of this embodiment, take by weighing the AlF of raw material gross mass 2.5% 3 As a flux, SrCO 3 、Al 2 (CO 3 ) 3 , MnCO 3 and AlF 3 Put it into an agate mortar and ...

Embodiment 2

[0056] On the basis of the research conclusions of Example 1, this example further optimizes the Sr / Al ratio in order to obtain the best luminous efficiency, so the chemical formula of the synthesized fluorescent material designed in this example is (Sr 0.9995 mn 0.0005 )O·δAl 2 o 3 , where δ=1.1, 1.25, 1.33 and 1.45.

[0057] The preparation method is the same as in Example 1.

[0058] The emission spectrum of the fluorescent material prepared in this embodiment under 460nm excitation is as follows: figure 2As shown, the SrO:Al with the highest luminous intensity 2 o 3 The ratio is 1:1.33. Using a HITACHI F4500 spectrometer, the sample (Sr 0.9995 mn 0.0005 )O·1.33Al 2 o 3 The emission spectrum under excitation at 460nm and the excitation spectrum at 652nm are monitored as image 3 shown. From image 3 It can be seen that this fluorescent material has a broadband absorption in the range of 400-500nm, and this absorption band matches well with the emission wavelen...

Embodiment 3

[0060] On the basis of the above research conclusions, this embodiment further optimizes the concentration of the activator Mn in order to obtain the best luminous efficiency, so the chemical formula of the synthetic fluorescent material designed in this embodiment is (Sr 1-r mn r )Al 2.66 o 4.99 , where r=0.0001, 0.0005, 0.001 and 0.002.

[0061] The preparation method is the same as in Example 1.

[0062] The emission spectrum of the fluorescent material prepared in this embodiment under 460nm excitation is as follows: Figure 4 As shown, thus indicating that the optimum concentration of Mn is 0.05%M.

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Abstract

The invention discloses a LED red fluorescent material and its preparation method, wherein the composition of the LED red fluorescent material is expressed in a general formula (M1-rMnr)sAltOs+1.5t, wherein 0<r<=1.0; 1<=s<=12; 2<=t<=32, M is one or more from Sr, Ba, Ca, Mg and Zn; The preparation method comprises the following steps: mixing the raw materials according to the proportion and grinding to obtain a mixture, calcining the mixture under the temperature of 1100-1600 DEG C for 1-20 hours and cooling to the room temperature to obtain the sintered products, fragmenting the sintered products and grinding to obtain the fluorescent material. The LED red fluorescent material is capable of radiating with high efficiency by adopting 420-480nm blue light excitation or 380-420nm near ultraviolet light excitation. No harmful exhaust gas with a great amount is discharged to environment during the preparation process.

Description

1. Technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to an LED red fluorescent material and a preparation method thereof. 2. Background technology [0002] Light-emitting diodes (Light-emitting diodes, LED) are called the fourth generation of green lighting sources after incandescent lamps, halogen lamps and fluorescent lamps. Compared with incandescent lamps and fluorescent lamps, LEDs have low power consumption and high energy conversion efficiency. High (not limited by the energy conversion efficiency of incandescent lamps and fluorescent lamps), less heat radiation (reduces the greenhouse effect) and environmental friendliness (no mercury pollution). In addition, LEDs are small in size and good in shock resistance, which is easy to realize and other Application combination of energy-saving equipment. At present, LED has been successfully used in automotive lighting, traffic signal indication, landscape ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
Inventor 陈雷张耀罗安琪蒋阳李俊巍李山鹰王彬彬
Owner HEFEI UNIV OF TECH
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