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a cr 3+ Activated near-infrared phosphor, preparation method and application

A phosphor and near-infrared technology, applied in chemical instruments and methods, luminescent materials, active medium materials, etc., can solve the problems of untunable luminous efficiency of excitation light, difficulty in growing high-quality single crystals, and high melting point, and achieve energy saving and environmental protection in the preparation process. , Solve the effect of serious thermal effect and high luminous efficiency

Active Publication Date: 2021-05-07
CHANGZHOU VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluoride such as LaF 3 , CaF 2 、BaF 2 etc., fluoride crystals will not appear concentration quenching phenomenon due to doping with high concentration of active ions, and have a wide fluorescence spectrum, which has the advantage of achieving high temperature oscillation; metal oxide crystals such as CaWO 4 、CaMoO 4 、YVO 4 etc. This type of material is based on CaWO 4 Crystal-based laser crystals obtained by doping trivalent transition metal ions or trivalent rare earth ions, but they have the disadvantages of high melting point and difficulty in growing high-quality single crystals
At the same time, the excitation light of current fluorescent materials is not tunable and the luminous efficiency is low, which has become a bottleneck restricting the development of fluorescent materials. How to obtain higher radiant flux is the focus of development.

Method used

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  • a cr <sup>3+</sup> Activated near-infrared phosphor, preparation method and application
  • a cr <sup>3+</sup> Activated near-infrared phosphor, preparation method and application
  • a cr <sup>3+</sup> Activated near-infrared phosphor, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Na 3 al 0.95 Cr 0.05 MoW 2 o 12

[0030] According to the chemical formula Na 3 al 0.95 Cr 0.05 MoW 2 o 12 The molar ratio of the elements Na, Al, Cr, Mo, W in the 2 CO 3 : 0.795 g, aluminum oxide Al 2 o 3 : 0.242 grams, chromium oxide Cr 2 o 3 : 0.019 g, molybdenum oxide MoO 3 :0.720 g, tungsten oxide WO 3 : 2.319 grams, placed in a mortar and thoroughly ground and mixed uniformly, then calcined the obtained mixture in an air atmosphere, the calcined temperature was 800 ° C, and the calcined time was 1 hour, fully ground and mixed uniformly after being cooled to room temperature, and then in an air atmosphere Calcined again at 900°C, calcination time is 4 hours, cooled and ground to get Cr 3+ Activated near-infrared phosphors.

[0031] See attached figure 1 , is the X-ray powder diffraction spectrum of the sample prepared according to the technical scheme of Example 1, which shows that the prepared sample is a single pure phase with hi...

Embodiment 2

[0037] Preparation of Na 3 al 0.999 Cr 0.001 MoW 2 o 12

[0038] According to the chemical formula Na 3 al 0.999 Cr 0.001 MoW 2 o 12 The molar ratio of each element in, weighed sodium bicarbonate NaHCO 3 : 1.260 grams, aluminum hydroxide Al(OH) 3 : 0.390 grams, chromium nitrate Cr (NO 3 ) 3 : 0.001 g, ammonium molybdate (NH 4 ) 2 MoO 4 : 0.980 g and ammonium tungstate (NH 4 ) 10 W 12 o 41 ·xH 2 O: 2.536 grams, placed in a mortar and thoroughly ground and mixed evenly, then calcined under air atmosphere, the calcining temperature is 300°C, and the calcining time is 8 hours, then after cooling down, grind and mix evenly again, and continue calcining under air atmosphere , the calcination temperature is 950°C, and the calcination time is 1 hour. After cooling, take out the sample and grind it into powder to obtain Cr 3+ Activated near-infrared phosphors.

[0039] Cr obtained in this example 3+ The phase, particle morphology, excitation spectrum, emission sp...

Embodiment 3

[0041] Preparation of Na 3 al 0.93 Cr 0.07 MoW 2 o 12

[0042] According to the chemical formula Na 3 al 0.93 Cr 0.07 MoW 2 o 12 The molar ratio of the elements Na, Al, Cr, Mo, W in the element, respectively weighed sodium nitrate NaNO 3 : 1.275 grams, aluminum oxide Al 2 o 3 : 0.237 g, chromium oxide Cr 2 o 3 : 0.027 g, molybdenum oxide MoO 3 : 0.720 g, sodium tungstate dihydrate Na 2 WO 4 2H 2 O: 3.299 grams, placed in a mortar, fully ground and mixed evenly, then pre-calcined the obtained mixture in an air atmosphere, the pre-calcined temperature was 750 ° C, the pre-calcined time was 3 hours, cooled to room temperature, ground and mixed uniformly , calcined again under the air atmosphere, the calcination temperature is 700 ℃, the calcination time is 10 hours, after cooling, grind to get Cr 3+ Activated near-infrared phosphors.

[0043] Cr obtained in this example 3+ The phase, particle morphology, excitation spectrum, emission spectrum and decay curve o...

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Abstract

The invention discloses a Cr 3+ Activated near-infrared phosphor, preparation method and application, its general chemical formula is Na 3 al 1‑ x Cr x MoW 2 O 12 , where x is Cr 3+ Doping instead of Al 3+ The molar ratio of 0.001≤x≤0.1. The invention is synthesized by a solid-phase reaction method, the synthesis process is simple, the operation is convenient and the requirements for equipment are low, the preparation process is energy-saving and environment-friendly, and the particle size of the obtained fluorescent powder is uniform, with high crystallinity and good stability. The fluorescent powder provided by the present invention has strong excitation in the ultraviolet region, and can emit near-infrared light after excitation, with a luminous wavelength of 703 nanometers and high luminous efficiency. The Cr 3+ The activated phosphor can be used in near-infrared lasers, which can solve the problems of serious thermal effects and low overall luminous efficiency of solid-state lasers, and thus realize high efficiency and miniaturization of laser devices.

Description

technical field [0001] The present invention relates to a Cr 3+ The activated near-infrared phosphor, its preparation method and application belong to the technical field of inorganic phosphor materials. Background technique [0002] Laser is one of the most important inventions of contemporary science and technology. People call it "the fastest knife", "the most accurate ruler" and "the brightest light". The first laser invented by mankind was a near-infrared laser invented by American scientist Theodore Maiman (Maiman) in 1960, using ruby ​​as the pump source. The main component of this ruby ​​is mixed with Cr 3+ Ionic alumina, Cr 3+ The ion is an extremely important luminescent center ion, and its fluorescence spectrum is determined by 4 T 2 → 4 A 2 The wide near-infrared luminescence band produced by the transition and the 2 E→ 4 A 2 It is composed of very weak R fluorescence lines generated by the transition, and its fluorescence characteristics are closely rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68H01S3/16
Inventor 唐惠东
Owner CHANGZHOU VOCATIONAL INST OF ENG
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