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Near-infrared fluorescent material and preparation method thereof, and LED luminescent device and preparation method thereof

A technology of fluorescent materials and light-emitting devices, which is applied in the field of near-infrared fluorescent materials and preparation, can solve the problems of not being able to meet the needs of photobiological activity, and achieve the effects of meeting the needs of photobiological activity, enhancing capture, and improving luminous efficiency

Active Publication Date: 2021-10-29
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the emission wavelength peaks of the materials prepared by the prior art are not in the range of 810-835nm, which cannot meet the needs of photobiological activity.

Method used

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  • Near-infrared fluorescent material and preparation method thereof, and LED luminescent device and preparation method thereof
  • Near-infrared fluorescent material and preparation method thereof, and LED luminescent device and preparation method thereof
  • Near-infrared fluorescent material and preparation method thereof, and LED luminescent device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a method for preparing a near-infrared fluorescent material, comprising the following steps:

[0056] S1: the oxide of the rare earth element, Sc 2 o 3 、H 3 BO 3 and Cr(NO 3 ) 3 9H2 Oaccording to metering ratio RESc 2.925 Cr 0.075 (BO 3 ) 4 (RE=Ce, Eu, Gd, Lu, Y, Tb) mixed evenly (total weight is 10 grams, H 3 BO 3 5% excess) into a corundum crucible, put the corundum crucible into a muffle furnace, raise the temperature to 200°C at 5°C / min, keep it warm for 0.5h, then raise the temperature to 500°C at 5°C / min, keep it warm for 2h, and then The furnace is cooled to room temperature to obtain the first calcined product; the oxide of the rare earth element is CeO 2 、Eu 2 o 3 、Gd 2 o 3 、Lu 2 o 3 , Y 2 o 3 and Tb 4 o 7 .

[0057] S2: mix the first calcined product with 2% AlF 3 Mix the flux evenly and put it into the corundum crucible, put the corundum crucible into the muffle furnace, raise the temperature to 900°C at 5°C / min...

Embodiment 2-4

[0064] Present embodiment 2-4 provides a kind of preparation method of near-infrared fluorescent material, present embodiment 2-4

[0065] The difference from Example 1 is that the temperature of the second temperature increase in step S2 is different, which are 1150°C, 1200°C and 1300°C respectively;

[0066] Namely S2: mix the first calcined product with 2% AlF 3 Mix the flux evenly and put it into the corundum crucible, put the corundum crucible into the muffle furnace, raise the temperature to 900°C at 5°C / min, keep it for 2h, then raise the temperature to 1150°C at 5°C / min, hold it for 8h, and then keep it at 5°C / min °C / min to cool down to 600 °C, and cool down to room temperature with the furnace to obtain the second calcined product;

[0067] or S2: mix the first calcined product with 2% AlF 3 Mix the flux evenly and put it into the corundum crucible, put the corundum crucible into the muffle furnace, raise the temperature to 900°C at 5°C / min, keep it for 2h, then rai...

Embodiment 5-8

[0072] Present embodiment 5-8 provides a kind of preparation method of near-infrared fluorescent material, present embodiment 5-8

[0073] The difference with embodiment 1 is: the heat preservation time of the second temperature rise of step S2 is different, changed from 8h to 2h, 4h, 6h, 10h respectively;

[0074] Others are the same as in Example 1.

[0075] It can be known from Fig. 2(c)-(d) that the best holding time for preparing near-infrared fluorescent material in the present invention is 8h.

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Abstract

The invention belongs to the technical field of intelligent manufacturing, and discloses a near-infrared fluorescent material and a preparation method thereof, and an LED luminescent device and a preparation method thereof. The near-infrared fluorescent material is RESc<3-x>Crx(BO3)4, wherein RE is one or more of rare earth elements Ce, Eu, Gd, Lu, Y and Tb, and Ce and Gd do not coexist; 0.001 <= x <= 0.30. The emission wavelength peak value of the near-infrared fluorescent material disclosed by the invention is 815 to 835 nm.

Description

technical field [0001] The invention belongs to the technical field of intelligent manufacturing, and more specifically relates to a near-infrared fluorescent material and a preparation method, an LED light-emitting device and a preparation method. Background technique [0002] Myopia is a worldwide problem affecting children and adolescents. For myopia patients, they have myopia when they are young, face a high risk of retinal detachment in middle age, and face risks of vitreous lesions, cataracts, glaucoma, macular holes, posterior staphyloma and other diseases in old age. Therefore, the prevention and control of myopia is an important social issue, especially for countries and regions with a high incidence of myopia in the world. [0003] At present, the latest technologies used to prevent and control myopia mainly include: wearing multi-focal lens frame glasses, using low-concentration atropine, wearing orthokeratology lenses and using 650nm laser irradiation. These te...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/778C09K11/7797H01L33/502H01L33/504Y02B20/00
Inventor 陈雷
Owner HEFEI UNIV OF TECH
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