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La2Ti2O7: Eu3 +, Sm3 + fluorescent powder and preparation method thereof

A phosphor and molar ratio technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems affecting the use of LED lamps, restricting wide application, and unsatisfactory excitation range of phosphors, etc., and achieve simple production equipment and simple process Effect

Inactive Publication Date: 2010-10-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But La 2 Ti 2 o 7 :Eu 3+ The excitation range of phosphor powder is still not ideal. When the chip ages, the excitation range shifts, which will seriously affect the use of LED lights, and affect and limit the wide application of this material

Method used

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  • La2Ti2O7: Eu3 +, Sm3 + fluorescent powder and preparation method thereof
  • La2Ti2O7: Eu3 +, Sm3 + fluorescent powder and preparation method thereof
  • La2Ti2O7: Eu3 +, Sm3 + fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Get 0.7331g (0.00225mol) of lanthanum oxide, 0.3994g (0.005mol) of titanium oxide, 0.088g (0.00025mol) of europium oxide, add 20ml concentration and be 99.8% dehydrated alcohol, take it as mixing medium, stir by magnetic force for 25min and Ultrasonic mixing was carried out for 7 minutes, and after uniform mixing, the raw materials were dried in an oven at 80°C for 2 hours. Put the obtained ingredients into an alumina crucible, put it into a muffle furnace, raise the temperature to 1400°C in an air atmosphere, and the heating rate is 7°C / min. At this temperature, keep it warm for 1.5 hours; finally, naturally cool to room temperature. La 1.8 Ti 2 o 7 :Eu 3+ 0.2 Phosphor. figure 1 La prepared for this example 1.8 Ti 2 o 7 :Eu 3+ 0.2 The PL spectrum of phosphor powder, it can be seen from the figure that La 1.8 Ti 2 o 7 :Eu 3+ 0.2 exist 7 f 0 → 5 L 6 The half-width range of the excitation peak is: 392nm→403.4nm.

Embodiment 2

[0029] Get lanthanum oxide 0.7249g (0.00222mol), titanium oxide 0.3994g (0.005mol), europium oxide 0.088g (0.00025mol), samarium oxide 0.0088g (0.0000252mol), add 24ml concentration and be 99.8% dehydrated alcohol, use it As a medium, stir magnetically for 30 minutes and mix ultrasonically for 5 minutes. After mixing evenly, dry the raw materials in an oven at 70°C for 4 hours. Put the obtained ingredients into an alumina crucible, put it into a muffle furnace, raise the temperature to 1300°C, the heating rate is 5°C / min, and keep it warm for 2 hours at this temperature; finally, in this environment, cool it naturally to room temperature. After manual grinding and crushing, La1.78Ti2O7:Eu3+0.2, Sm3+0.02 phosphors were obtained. figure 2 The PL spectrum of the La1.78Ti2O7:Eu3+0.2, Sm3+0.02 fluorescent powder prepared for this example, it can be seen from the figure that the half-maximum width of the excitation peak of La1.8Ti2O7:Eu3+0.2 at 7F0→5L6 is: 392nm→403.4nm, now dope...

Embodiment 3

[0031] Get lanthanum oxide 0.7086g (0.002175mol), titanium oxide 0.3994g (0.005mol), europium oxide 0.088g (0.00025mol), samarium oxide 0.0262g (0.0000751mol), add 15ml concentration and be 99.8% dehydrated alcohol, use it As a medium, the mixture was stirred by magnetic force for 20 minutes and ultrasonically mixed for 10 minutes. After mixing evenly, the raw materials were dried in an oven at 60° C. for 5 hours. Put the obtained ingredients into an alumina crucible, put it into a muffle furnace, raise the temperature to 1500°C, the heating rate is 7°C / min, and keep it warm for 1 hour at this temperature; finally, under this environment, the natural Cool to room temperature. After manual grinding and crushing, La 1.74 Ti 2 o 7 :Eu 3+ 0.2 , Sm 3+ 0.06 Phosphor. image 3 La prepared for this example 1.74 Ti 2 o 7 :Eu 3+ 0.2 , Sm 3+ 0.06 The PL spectrum of phosphor powder, it can be seen from the figure that La 1.8 Ti 2 o 7 :Eu 3+ 0.2 exist 7 f 0 → 5 L 6 ...

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Abstract

The invention relates to La2Ti2O7: Eu3 +, Sm3 + fluorescent powder and a preparation method thereof, wherein the molar ratio of lanthanum to titanium to europium to samarium is (0.65 to 1): 1: (0 to 0.3): (0 to 0.05). The preparation process comprises the following steps that: taking lanthana, titania, europia and samaria as raw materials, uniformly mixing in absolute ethyl alcohol, and drying for 2 to 5h at 60 to 80DEG C; calcining the mixture under the air atmosphere, increasing the temperature to 1300 to 1500DEG C at the rate of 5 to 7DEG C / min, and maintaining the temperature for 1 to 2h;and crushing a calcined product so as to obtain the white fluorescent powder. The half-peak width of the La2Ti2O7: Eu3 +, Sm3 + fluorescent powder at a 395nm excitation peak is 25 to 65 percent more than that of La2Ti2O7: Eu3 + fluorescent powder. The preparation method has the advantages of simple process, simple required production equipment and easily realized industrial production.

Description

technical field [0001] The present invention belongs to La 2 Ti 2 o 7 Phosphor powder and its preparation field, especially related to La 2 Ti 2 o 7 :Eu 3+ , Sm 3+ Phosphor powder and its preparation method. Background technique [0002] Since the invention of InGaN-based blue light-excited white light-emitting diodes (White-LEDs), the application of white-light LEDs in electronic devices has developed rapidly, such as the backlight of mobile phones; at the same time, with the advancement of semiconductor chip technology and high-efficiency fluorescent With the development of powder, the luminous efficiency of white LED has been and will be more significantly improved. White LEDs have shown the potential to replace traditional lighting methods. At present, the luminous efficiency of white LEDs has surpassed incandescent lamps and is approaching fluorescent lamps. And because of the long life, energy-saving and environment-friendly characteristics of white LED, the a...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 王宏志孙壮李耀刚张青红
Owner DONGHUA UNIV
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