A kind of highly stable, volatile heteronuclear rare earth chelate and its preparation method and application

Abstract

The invention provides a highly stable and volatile heteronuclear rare earth chelate compound and a preparation method and application thereof. The preparation method of the heteronuclear rare earth chelate comprises: reacting at least two rare earth oxides with an inorganic acid to obtain a mixed aqueous solution of rare earth salts; adding alcohol to diketone ligands to obtain a mixed solution; The heteronuclear rare earth chelate compound is obtained by dropwise adding to the mixed solution for reaction; the preparation method of the present invention utilizes the reaction of the rare earth salt mixed aqueous solution and the diketone ligand mixed solution to directionally synthesize the heteronuclear rare earth ions containing two or more rare earth ions. The nuclear rare earth chelate provides the feasibility of preparing double-clad optical fiber preforms by vapor-phase vapor deposition for realizing multi-species fixed ratio and one-step doping. Compared with the traditional release of dopant species by regulating the flow rate of carrier gas in different pipes To achieve the ratio of different dopants, the preparation method of the present application can precisely control the ratio of doped rare earth elements in one step and improve the unstable bottleneck of erbium rare earth chelate.

Description

technical field [0001] The invention relates to the technical field of rare earth chelate materials, in particular to a preparation method and application of a highly stable and volatile heteronuclear rare earth chelate compound. Background technique [0002] Due to the safety and efficiency of optical fiber communication technology, it has great application prospects in the commercial and military fields. Research on high-power optical fiber communication and fiber laser technology includes key materials, core devices, and systems and equipment. As far as key materials are concerned, the silica fiber (core rod) determines the performance of the fiber, and the doping reagent and process greatly affect the performance of the fiber preform. At present, the output power of the international single-mode fiber laser has reached 20 kilowatts, while that in my country is stable at about 5 kilowatts. The basic optical fiber material and device technology is far behind the advanced ...

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Problems solved by technology

[0003] At present, these rare earth chelate reagents are prepared by regulating the flow rate of carrier gas in different pipelines to release the flow rate of dopant species, and realize the proportioning of different dopants through the flow rate of different dopants. Therefore, the more doping species, the more complicated the process; the longer the doping distance, the greater the difference between the actual ratio of doping species and the initially set ratio concentration, making rare earth chelate The concentration of rare earth elements in the reagent cannot be precisely controlled

Second, Yb(TMHD) is commonly used in fiber doping 3 and Er(TMHD) 3 reagent, although Yb(TMHD) 3 The reagent has extremely high stability, and Er(TMHD) 3 The stability of the reagent is very poor, so how to accurately control the ratio of rare earth elements to achieve one-step sublimation and how to improve the stability of the chelate are currently the bottlenecks encountered, and this patent solves these two problems

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