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Yttrium titanate luminescent material and preparation method thereof

A luminescent material, yttrium titanate technology, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as low color rendering, weak white LED, etc., achieve good luminous performance, low equipment requirements, and good stability

Active Publication Date: 2017-01-25
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current industrialized white LED manufacturing method is to combine the blue LED die and YAG:Ce 3+ Combination of yellow microcrystals, the white light LED produced in this way is too weak in the red light band, resulting in low color rendering. In order to solve the above problems, international attempts have been made to use InGaN with near ultraviolet-violet (350-410nm) radiation Die (UVLED) excites three primary color phosphors to realize white LED
The method is to coat several kinds of phosphors on the UVLED tube core, and the tube core excites the phosphors to form red light, green light, and blue light emission, and the three colors of light are superimposed to obtain white light. Since the naked eye is not sensitive to light in the 350-410nm band, this The color of white-like LEDs is only determined by phosphors. However, since existing photoluminescent phosphors are generally not suitable for excitation in the 350-410nm band, it is very important to study new red fluorescent materials suitable for excitation of UVLED tube cores.

Method used

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  • Yttrium titanate luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of Y by high temperature solid phase method 1.999 Ti 2 O 7 :Eu 0.001 @Au 1×10 2:

[0024] TiO 2 Preparation of @Au: Weigh 10.3 mg of chloroauric acid (AuCl 3 ·HCl·4H 2 O) dissolve in deionized water to give 20mL of 5×10 -3 mol / L chloroauric acid solution; pipette 5 mL of 4.3 mol / L triethanolamine titanium isopropoxide, and dilute to 1 mol / L with isopropanol. Pipette 20mL5×10 -3 mol / L chloroauric acid solution and 5mL1mol / L isopropanol solution of titanium triethanolamine isopropoxide, stir well; then add 15mL dimethylformamide, stir at room temperature for 15min, use a condensing reflux device to heat and stir , the heating temperature is 140 ° C, the solution passes through colorless to light brown, and then to dark brown, stop heating, cool to room temperature, and obtain TiO 2 @Au 1×10 ˉ 2 colloids. Then centrifuged, washed with ethanol, and dried to obtain TiO 2 @Au solid, where Au and TiO 2 The molar ratio is 2×10 -2 .

[0025] Y 1.999 ...

Embodiment 2

[0027] Preparation of Y by high temperature solid phase method 1.9 Ti 2 O 7 :Eu 0.1 @Ag 2.5×10 -4:

[0028] TiO 2 Preparation of @Ag: Weigh 3.4 mg of silver nitrate (AgNO 3 ) was dissolved in deionized water to obtain 20 mL of 1×10 - 3 mol / L silver nitrate solution; pipette 10 mL of 4.3 mol / L triethanolamine titanium isopropoxide, and dilute to 0.22 mol / L with isopropanol. Pipette 2mL1×10 -3 mol / L silver nitrate solution and 18 mL of 0.22 mol / L triethanolamine titanium isopropoxide solution in isopropanol, stir well; then add 10 mL of dimethylformamide, stir at room temperature for 15 min, and use a condensing reflux device for heating Stir, the heating temperature is 140 ° C, the solution is colorless to light brown, and then to dark brown, stop heating, cool to room temperature, and obtain TiO 2 @Ag 5×10 -4 colloids. Then centrifuged, washed with ethanol, and dried to obtain TiO 2 @Ag solids, where Ag and TiO 2 The molar ratio is 5×10 -4 .

[0029] Y 1.9 Ti ...

Embodiment 3

[0033] Preparation of Y by high temperature solid phase method 1.5 Ti 2 O 7 :Eu 0.5 @Pt 5×10 -3:

[0034] TiO 2 Preparation of @Pt: Weigh 51.8 mg of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) dissolve in deionized water to give 10mL of 5×10 -3 mol / L chloroplatinic acid solution; pipette 5 mL of 4.3 mol / L triethanolamine titanium isopropoxide, and dilute to 0.5 mol / L with isopropanol. Pipette 8mL5×10 -3 mol / L chloroplatinic acid solution and 16 mL of 0.5 mol / L triethanolamine titanium isopropoxide solution in isopropanol, stir well; then add 6 mL of dimethylformamide, stir at room temperature for 15 min, use a condensation reflux device to carry out Heating and stirring, the heating temperature is 140 ° C, the solution is colorless to light brown, and then to dark brown, stop heating, and cool to room temperature to obtain TiO 2 @Pt 5×10 -3 colloids. Then centrifuged, washed with ethanol, and dried to obtain TiO 2 @Pt solids, where Pt and TiO 2 The molar ratio is 1...

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Abstract

The invention discloses an yttrium titanate luminescent material and a preparation method thereof, belonging to the field of luminescent materials. The general chemical formula of the luminescent material is Y2-xTi2O7:Eux@My, wherein Y2-xTi2O7:Eux is a shell, M is a core, @ refers to coating, M is at least one selected from metal nanoparticles consisting of Ag, Au, Pt, Pd and Cu, x is more than 0 and no more than 0.5, and y is the mol ratio of M to Y2-xTi2O7:Eux and is more than 0 and no more than 1 * 10<-2>. According to the yttrium titanate luminescent material provided by the invention, a core-shell structure is formed through coating of the M metal particle, so quantum efficiency in the yttrium titanate luminescent material is improved; the M metal particle enhances luminous intensity of the yttrium titanate luminescent material; and the prepared Y2-xTi2O7:Eux@My luminescent material has the advantages of good stability and good luminescence properties.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a yttrium titanate luminescent material coated with metal nanoparticles and a preparation method thereof. Background technique [0002] As a new type of solid-state light source, white LEDs have great application prospects in the field of lighting and display due to their advantages of energy saving, environmental protection, long life, small size and so on. The current industrialized white LED production method is to combine blue LED die and YAG:Ce 3+ The combination of yellow crystallites, the white LED made in this way has low color rendering due to the weak radiation in the red band. In order to solve the above problems, international attempts have been made to use InGaN with near-ultraviolet-violet (350-410nm) radiation. The die (UVLED) excites three primary color phosphors to realize white LEDs. The method is to coat several kinds of phosphors on the UVLED die, the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 周明杰王荣
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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