CN-122012094-A - Cr (chromium)3+Activated tantalum-based oxide broadband near infrared luminescent material and preparation method thereof

Abstract

The invention discloses a Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material and a preparation method thereof. The invention prepares the Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material by mixing raw materials containing lutetium, yttrium, calcium, gallium, tantalum and chromium according to a specific metering ratio and then sintering at a high temperature, wherein the luminescent intensity of the material under the excitation of 330 nm is 12.37 times of that of blue light (448 nm), the near infrared luminescent material has good thermal stability, the luminescent intensity under the excitation of near ultraviolet light (330 nm) at 150 ℃ can reach 13.70 times of that under the excitation of blue light (448 nm), the near infrared luminescent material has the advantages of simple synthesis, high luminescent intensity under the excitation of near ultraviolet light and the like, and can be applied as a near infrared light conversion material excited by a near ultraviolet chip.

Inventors

• ZHOU JIANBANG
• HUO JIANSHENG

Assignees

• 广东省科学院资源利用与稀土开发研究所

Dates

Publication Date

20260512

Application Date

20251212

Claims (10)

1. 1. A Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material is characterized in that the chemical composition formula of the near infrared luminescent material is Lu 0.7 Y 0.3 Ca 2 Ga 4-x TaO 12 :xCr 3+ , wherein x is the substitution amount of Cr, and 0< x <1.
2. 2. The Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material according to claim 1, wherein x is 0.01≤x≤0.13.
3. 3. The preparation method of the Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material as claimed in claim 1 or 2 is characterized by comprising the steps of weighing raw materials containing lutetium, yttrium, calcium, gallium, tantalum and chromium according to the stoichiometric ratio of Lu 0.7 Y 0.3 Ca 2 Ga 4-x TaO 12 :xCr 3+ , fully grinding and mixing, placing the raw materials into a reaction container, sintering in air atmosphere, cooling to room temperature and grinding to obtain the target luminescent material.
4. 4. A method according to claim 3, wherein the sintering temperature is 1350-1400 ℃ and the sintering time is 6 hours.
5. 5. The method according to claim 4, wherein the sintering is performed at a rate of 3-5 ℃ per minute from room temperature to 1400 ℃.
6. 6. The method according to claim 3, wherein the raw material containing lutetium element is selected from the group consisting of lutetium oxide, lutetium oxalate, lutetium carbonate and lutetium nitrate, the raw material containing yttrium element is selected from the group consisting of yttrium oxide, yttrium oxalate, yttrium carbonate and yttrium nitrate, and the raw material containing calcium element is selected from the group consisting of calcium carbonate, calcium bicarbonate and calcium oxalate.
7. 7. The method according to claim 3, wherein the gallium-containing material is selected from gallium oxide, the tantalum-containing material is selected from tantalum oxide, and the chromium-containing material is selected from chromium oxide.
8. 8. Use of the Cr 3+ -activated tantalum-based oxide broadband near-infrared luminescent material as claimed in claim 1 or 2 as a near-infrared light conversion material.
9. 9. Use of the Cr 3+ -activated tantalum-based oxide broadband near-infrared luminescent material according to claim 1 or 2 in the fields of high-energy radiation detection and plant growth illumination.
10. 10. A light emitting device comprising a phosphor and an excitation light source, said phosphor comprising the Cr 3+ -activated tantalum-based oxide broadband near infrared light emitting material of claim 1 or 2.

Description

Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material and preparation method thereof Technical Field The invention relates to the technical field of inorganic luminescent materials, in particular to a Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material and a preparation method thereof. Background The near infrared luminescent material is used as a functional material capable of converting excitation light with specific wavelength into near infrared light, and has important application value in the fields of near infrared imaging, biomedical detection, plant growth illumination, high-energy ray detection and the like. Among them, inorganic oxide luminescent materials using transition metal ions (e.g., cr 3+) as an activator have been a hot spot of research in recent years because of their high chemical stability, excellent luminescent properties, relatively low preparation cost, and the like. Cr 3+ ion is easy to generate broadband near infrared luminescence in a crystal field due to its unique 3d 3 electron configuration, and the luminescence performance is closely related to the environment of the crystal field. Most of the Cr 3+ activated oxide near infrared luminescent materials reported at present show higher luminous intensity under blue light excitation, and the luminous efficiency under near ultraviolet light excitation is lower, which limits the matching application of the materials with near ultraviolet LED chips to a certain extent. Garnet oxides are considered as potentially good luminescent host materials because of their stable crystal structure and suitable crystal field environment. By introducing different activating ions and doping regulation, the light-emitting performance of the fluorescent lamp can be optimized. However, the existing garnet oxide near-infrared luminescent materials still have defects in the aspects of coverage range of excitation wave bands, luminescent intensity under near ultraviolet excitation and the like, and are difficult to meet the requirements of broadband near-infrared emission, different excitation wavelengths and stable operation in practical application. Therefore, the Cr 3+ activated tantalum-based oxide broadband near-infrared luminescent material which can be effectively excited by near ultraviolet-visible light and has high luminous intensity and good heat stability under near ultraviolet excitation is developed, and has important significance for expanding the application scene of the near-infrared luminescent material. Disclosure of Invention The invention provides a Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material and a preparation method thereof, wherein the luminescent material is prepared by mixing raw materials containing lutetium, yttrium, calcium, gallium, tantalum and chromium elements according to a specific metering ratio and then sintering the raw materials at a high temperature, the near infrared luminescent intensity under near ultraviolet excitation is obviously superior to that under blue light excitation, and the problem of low near ultraviolet excitation efficiency of the Cr 3+ activated oxide broadband near infrared luminescent material in the prior art is solved. The invention is realized by the following technical scheme: The first object of the invention is to provide a Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material, wherein the chemical composition formula of the near infrared luminescent material is Lu 0.7Y0.3Ca2Ga4-xTaO12:xCr3+, x is the substitution amount of Cr, and 0< x <1, preferably 0.01-0.13. The second object of the invention is to provide a preparation method of the Cr 3+ activated tantalum-based oxide broadband near infrared luminescent material, which comprises the following steps of respectively weighing raw materials containing lutetium, yttrium, calcium, gallium, tantalum and chromium according to chemical compositions, wherein the stoichiometric ratio of the metal elements lutetium, yttrium, calcium, gallium, tantalum and chromium is 0.7:0.3:2:4-x:1:x, wherein x is the substitution amount of Cr, 0< x <1, fully grinding and uniformly mixing, putting into a reaction container, sintering in an air atmosphere, cooling to room temperature and grinding to obtain the luminescent material. Preferably, the sintering temperature is 1350-1400 ℃ and the sintering time is 6 hours. Further preferably, sintering is performed at a rate of 3-5 ℃ per minute from room temperature to 1400 ℃. Preferably, the raw material containing lutetium element is selected from more than one of lutetium oxide, lutetium oxalate, lutetium carbonate and lutetium nitrate. Preferably, the raw material containing yttrium element is selected from more than one of yttrium oxide, yttrium oxalate, yttrium carbonate and yttrium nitrate. Preferably, the raw material containing the calcium element is selected from more than one of calciu