Near-infrared fluorescent powder, preparation method and LED device formed by near-infrared fluorescent powder

A near-infrared and phosphor technology, used in semiconductor devices, chemical instruments and methods, luminescent materials, etc., can solve the problems of high cost of near-infrared light sources, discontinuous emission bands, and narrow emission ranges, and achieve physical and chemical stability. Good, low cost of raw materials, small volume effect

Pending Publication Date: 2022-06-28
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the visible-near-infrared light source with a wide range of emission constructed by simply mixing a variety of phosphors is expensive, and at the same time, it will cause reabsorption between various luminescent materials and cause energy loss.
[0005] Rare earth ions and Cr 3+ Ion co-doping can achieve efficient energy transfer and may construct efficient energy transfer, however, the existing Ce 3+ with Cr 3+ Ion-codoped wide-range visible-near-infrared luminescent materials have a narrow emission range and discontinuous emission bands, which limit the application of this type of visible-near-infrared luminescent materials in plant lighting and hyperspectral imaging technology

Method used

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  • Near-infrared fluorescent powder, preparation method and LED device formed by near-infrared fluorescent powder
  • Near-infrared fluorescent powder, preparation method and LED device formed by near-infrared fluorescent powder
  • Near-infrared fluorescent powder, preparation method and LED device formed by near-infrared fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0051] MgO, Al 2 O 3 , SiO 2 and Cr 2 O 3 The powder is weighed according to the formula of the molar ratio of Mg, Al, Si and Cr elements of 30:19:50:1, and then ground with an agate mortar for 0.5–1 h until the mixture is uniform. Put the alumina crucible containing the mixed and ground glass matrix raw materials into the 5% H 2 and 95%N 2 In a tube furnace with a reducing atmosphere, the temperature was kept at 1550 °C for 5 hours; the obtained melt was naturally cooled with the tube furnace to obtain a blue glass matrix, that is, a blue glass precursor, and then the blue glass matrix was put into a 5% H 2 and 95%N 2 In a tube furnace in a reducing atmosphere, the temperature is kept at 1050° C. for 1 hour to obtain near-infrared fluorescent glass ceramics, and the near-infrared fluorescent powder can be obtained by crushing. The XRD pattern of the finally obtained near-infrared phosphor is shown in the attached figure 1 As shown, it can be seen that the near-infrar...

Embodiment 2

[0053] MgO, Al 2 O 3 , SiO 2 and Cr 2 O 3 The powder is weighed according to the formula of the molar ratio of Mg, Al, Si, and Cr elements of 30:19:50:1, and then ground with an agate mortar for 0.5–1 h until the mixture is uniform. The alumina crucible containing the mixed and ground glass matrix raw materials was placed in a high-temperature box furnace in an atmospheric environment, and kept at 1600 ° C for 4 hours; the obtained melt was naturally cooled with the high-temperature box furnace to obtain a green glass matrix, namely The green glass precursor is then put into a high-temperature box furnace in the atmosphere and kept at 1100° C. for 1 hour to obtain a near-infrared fluorescent glass ceramic, which is pulverized to obtain a near-infrared fluorescent powder.

Embodiment 3

[0055] MgO, Al 2 O 3 , SiO 2 , Eu 2 O 3 and Cr 2 O 3 The powder is weighed according to the formula of Mg, Al, Si, Eu, and Cr with a molar ratio of 29.5:19:50:0.5:1, and then ground with an agate mortar for 0.5–1 h until the mixture is uniform. Put the alumina crucible containing the mixed and ground glass matrix raw materials into the 5% H 2 and 95%N 2 In a tube furnace with a reducing atmosphere, the temperature was kept at 1550°C for 5h. The obtained melt was naturally cooled with a tube furnace to obtain a blue glass matrix, and then the blue glass matrix was put into a 5% H 2 and 95%N 2 A tube furnace in a reducing atmosphere is kept at 1050°C for 1 hour to obtain visible-near-infrared fluorescent glass ceramics, which can be crushed to obtain visible-near-infrared phosphors. The XRD pattern of the final visible-near-infrared phosphor is attached figure 1 As shown, it can be seen that the visible-near-infrared light-emitting material is a single pure phase. Th...

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Abstract

The invention discloses near-infrared fluorescent powder, the chemical general formula of the near-infrared fluorescent powder is A2Al4Si5O18: Cr < 3 + > or A2Al4Si5O18: Eu < 2 + > and Cr < 3 + >, and A is one of Mg, Ca, Sr, Ba and Zn. According to the near-infrared fluorescent powder, the preparation method and the LED device formed by the near-infrared fluorescent powder, the near-infrared fluorescent powder and the visible-near-infrared fluorescent powder which are wide in reflection range and continuous in emission band and the LED device formed by the near-infrared fluorescent powder and the visible-near-infrared fluorescent powder can be provided; various application requirements of plant illumination, security night vision, biological detection and imaging, near infrared spectrum technology, hyperspectral imaging technology and the like can be met.

Description

technical field [0001] The invention relates to the technical field of inorganic light-emitting materials, in particular to a near-infrared phosphor, a preparation method and an LED device formed therefrom. Background technique [0002] Traditional near-infrared light sources such as halogen lamps can provide near-infrared emission with high brightness and wide emission range. However, such near-infrared light sources have shortcomings such as high energy consumption, short service life, low photoelectric conversion efficiency, large volume, and large heat generation, which cannot meet the needs of future application scenarios. Therefore, the development of fluorescent-converted LEDs that are comparable in performance to conventional near-infrared light sources has received extensive attention. [0003] Cr 3+ The ions can occupy a weak crystal field environment to achieve short-wave near-infrared emission at 700–1100 nm, and can be efficiently excited by blue LED chips. N...

Claims

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Application Information

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IPC IPC(8): C09K11/64H01L33/50
CPCC09K11/77344C09K11/685H01L33/502
Inventor 雷炳富邹西坤张浩然张学杰李唯郑明涛刘应亮陈剑英董汉武
Owner SOUTH CHINA AGRI UNIV
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