Method for preparing yttrium vanadate crystals

Abstract

The invention provides a method for preparing yttrium vanadate crystals, which comprises the following steps: (1) dissolving 0.117g and 0.1mmol of N4VO3 solid in 1mL of HNO3, and adding N,N-dimethylformamide and water into the mixed solution; (2) putting 0.107g of Y2O3 in a container, adding 2mL of HNO3 and 2mL of H2O into the container, heating the mixture to the high concentration melting state, then adding 3mL of H2O, repeating the processes twice, and then immediately adding the obtained solution in the step (1) into the obtained product to stir for 20 minutes; (3) adding 1ml and 0.5mol / L of Eu(NO3)3 into the obtained solution in the step (2), stirring the mixture for 30 minutes, transferring the mixture into a reaction kettle the lining of which is made from polyfluortetraethylene, sealing the reaction kettle to make the mixture react for 4 to 24 hours at a temperature of 180 DEG C, and when the reaction kettle is naturally cooled to the room temperature, carrying out centrifugal separation on the obtained precipitate, using ethanol and distilled water to repeatedly wash the obtained product and then drying the washed product for 12 hours at a temperature of 80 DEG C; and (4) heating the obtained product in the step (3) from the normal temperature to 600 to 900 DEG C at a speed of 1 DEG C per minute, and carrying out constant temperature calcining for 3 hours at the temperature of between 600 and 900 DEG C.

Description

technical field [0001] The invention relates to a preparation method of yttrium vanadate crystal. Background technique [0002] YVO 4 Has a zircon-type structure, a very well-known matrix that can be doped with several metal ions such as Eu 3+ , Dy 3+ , Sm 3+ , Bi 3+ etc., and prepare a series of luminescent powders that can emit visible light of various colors. where YVO 4 : Eu is an excellent red light material. As a red luminescent powder, it has a long history in color TV cathode ray tubes and high-pressure mercury lamps. When excited with ultraviolet light, its photoluminescence efficiency can be as high as 70%. YVO 4 :Dy Because of Dy's yellow light( 4 f 9 / 2 - 6 h 13 / 2 ) and Blu-ray ( 4 f 9 / 2 - 6 h 15 / 2 ), making it possible to become a white light emitting powder, and for Dy 3+ say with Y 2 o 3 , YPO 4 and YNbO 4 Matrix compared to YVO 4 System is always the most effective matrix. YVO 4 :Eu 3+ Phosphor powder is a low-voltage cathodoluminescent...

AI Technical Summary

Problems solved by technology

Synthesis of YVO by traditional high-temperature solid-phase method 4 There are shortcomings such as high sintering temperature, long synthesis time, and irregular morphology of particles (H.Wang, D.H.Chen, W.J.Tang, Materials Science and Engineering B.136, 193 (2007); B.Jancar, M.Valant, D. Suvorov, Chem. Mater. 16, 1075 (2004))

Synthesis of YVO by Sol-Gel Method 4 The operation is simple and the sintering temperature is low, but it is also difficult to control the particle size of the product so that it is difficult to obtain a product with a regular shape (H.wang, M.Yu, C.K.Lin, J.Lin, J ColloidInterf Sci.300, 172 (2006) ; Hirano S, Yogo T, Kikuta K, Sakamoto W, Koganei H, J AmCeram Soc.79, 3041(1996))

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