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Near-infrared wide-spectrum fluorescent material as well as preparation method and application thereof

A fluorescent material and wide-spectrum technology, applied in the field of luminescent materials, can solve problems such as low internal quantum efficiency, restrictions on the application of near-infrared fluorescent conversion materials, and poor thermal stability of materials, and achieve simple preparation process, strong practicability, and low synthesis temperature Effect

Active Publication Date: 2021-10-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, for the developed materials, most of the peak wavelengths are concentrated within 800nm, and there are few materials larger than 800nm; there are few materials with internal quantum efficiencies higher than 80% and the emission peak wavelengths are all less than 800nm, and the external quantum efficiency is generally lower than 35%; Materials with peak wavelengths greater than 800nm ​​have poor thermal stability and generally low internal quantum efficiency (<80%)
These problems seriously restrict the application of near-infrared fluorescence conversion materials.

Method used

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  • Near-infrared wide-spectrum fluorescent material as well as preparation method and application thereof
  • Near-infrared wide-spectrum fluorescent material as well as preparation method and application thereof
  • Near-infrared wide-spectrum fluorescent material as well as preparation method and application thereof

Examples

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Embodiment 1

[0036] Chemical formula GA according to phosphor powder 0.998 CR 0.002 Tao 4 Weigh 0.0499mol Ga 2 O 3 , 0.0001mol Cr 2 O 3 , 0.05mol Ta 2 O 5 The above raw materials are analyzed and purified, and the raw materials weighing and sufficiently ground, after mixing is uniform, baked into the alumina crucible, and the calcination temperature is 1450 ° C for 12 hours. After cooling to room temperature, the product is broken, grind, washing, etc., that is, the chemical group has become GA. 0.998 CR 0.002 Tao 4Phosphor, which X- powder diffraction pattern (Cu target, λ = 0.15406nm) with GaTaO 4 Standards for such cards figure 1 As shown in which the excitation spectra, see (monitored at 840nm) figure 2 . Depend on figure 1 Understood, the present embodiment successfully prepared Ga 0.998 Cr 0.002 TaO 4 ;Depend on figure 2 The blue phosphor may be found in the range of 400 ~ 800nm ​​and the red effective excitation, the excitation main peak at 470nm. image 3 Example embodiments of the pres...

Embodiment 2

[0038] Al phosphor according to the formula 0.99 Cr 0.01 TaO 4 Weigh 0.0495mol Al 2 O 3 , 0.0005mol Cr 2 O 3 , 0.05mol Ta 2 O 5 The above raw materials were of analytical grade, the above raw materials were weighed and sufficiently triturated with mixed uniformly charged in an alumina crucible crucible fired, the firing temperature is 1300 ℃ incubated for 8 hours. After cooling to room temperature crushing product, after grinding, washing and other treatment, to obtain the chemical composition of Al 0.99 Cr 0.01 TaO 4 Phosphor, its excitation spectrum see (at 900nm monitor) Figure 4 ,Depend on Figure 4 The blue phosphor may be found in the range of 400 ~ 800nm ​​and the red effective excitation, the excitation main peak at 645nm. Figure 5 Examples of the present embodiment Al 0.99 Cr 0.01 TaO 4 The emission spectra from the Figure 5 Found that the emission spectrum covering 700-1300nm, whose main emission peak is located 900nm. At an excitation 460nm blue light, the quantum yield ...

Embodiment 3

[0040] Phosphor by chemical formula Ga 0.9998 Cr 0.0001 NbO 4 Weigh 0.04999mol Ga 2 O 3 , 0.000005mol Cr 2 O 3 , 0.05mol Nb 2 O 5 The above raw materials were of analytical grade, the above raw materials were weighed and sufficiently triturated with mixed uniformly charged in an alumina crucible crucible fired, the firing temperature of 1500 deg.] C for 4 hours. After cooling to room temperature crushing product, after grinding, washing and other treatment, to obtain a chemical composition of Ga 0.9998 Cr 0.0001 NbO 4 Phosphors excitation spectrum (monitored at 838nm) coverage of 400 ~ 800nm, the blue light can be in the range of 400 ~ 800nm ​​and the red effective excitation, the excitation main peak at 468nm. Blue light excitation at 460nm, Ga 0.9998 Cr 0.0001 NbO 4 The emission spectrum covering 700-1100nm, whose emission peak is located 838nm, the quantum yield was 75% (see Table 1).

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Abstract

The invention relates to the technical field of luminescent materials, in particular to a near-infrared wide-spectrum fluorescent material and a preparation method and application thereof. The near-infrared wide-spectrum fluorescent material disclosed by the invention has a chemical formula as shown in a formula (I), namely (M<1><1-m>Cr<m>)M<2>O<4>. In the formula (I), M<1> is selected from Al, Ga, Sc and In, and M<1> must comprise Al and / or Ga; the element M<2> is selected from Ta and Nb; and m is greater than or equal to 0.0001 and smaller than or equal to 0.1. According to the fluorescent material, an M<1>M<2>O<4> matrix material with a rigid structure is selected for Cr<3+> ion doping; and the fluorescent material which can be efficiently excited by blue light with a wavelength of 460 nm, has an emission peak value of 820-920 nm, can continuously change and is high in luminous efficiency is developed.

Description

Technical field [0001] The present invention relates to the field of luminescent materials, and more particularly to a near-red exterior and wide spectral fluorescent material and a preparation method thereof. Background technique [0002] Based on fluorescence conversion, near-infrared light-emitting diodes (PC-NIR-LEDs) have the advantages of low cost, stability, easy regulation, and other advantages over traditional near-infrared light sources, are widely used in biological imaging, food quality inspection, night vision monitoring. . Its specific application can be divided according to the wavelength, for example: near-infrared light of 650-950 nm and 1000-1400 nm in the biomara, the near-infrared light of 650-950 nm and 1000-1400 nm can penetrate the deep tissue, and produce a zero-fluorescent background, so that near-infrared biological imaging has a low letter. Noise ratio and high sensitivity. In the field of food detection, a near-infrared light-irradiated food that is co...

Claims

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Application Information

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IPC IPC(8): C09K11/68C09K11/80
CPCC09K11/681C09K11/7706Y02B20/00
Inventor 钟继有张宏世赵韦人
Owner GUANGDONG UNIV OF TECH
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