Multiple colour infrared up-conversion luminous material and preparing process thereof

Abstract

The invention discloses a multicolor infrared upconversion luminous material and a preparation method thereof. The material has a chemical composition formula: RE2-x-y(WO4)3: xLn,yYb, wherein x is between 0.02 and 0.2; y is between 0.2 and 0.6; Yb<3+> is used as a sensitizing agent, absorbs infrared photons and transfers energy to Ln in order that Ln ions irradiate; and under 980nm laser pumping, the material emits red light, green light, blue light or white light. In preparation, according to stoichiometric ratio, high-purity raw materials of rare earth oxide and tungsten trioxide are ground, are evenly mixed, are presintered for 3 to 10 hours in air at a temperature of between 700 and 900 DEG C, are ground, are sintered for 4 to 10 hours in the air at a temperature of between 1,100 and 1,200 DEG C and are naturally cooled to the room temperature, so as to obtain the product. In the preparation process, no organism is used; and no harmful exhaust gas is produced. The synthetic process is carried out in the air; and the preparation method has low equipment requirement and a simple process.

Description

technical field [0001] The invention relates to a luminescent material, in particular to an infrared up-conversion luminescent material capable of emitting red light, green light, blue light and white light and a preparation method thereof. Background technique [0002] Up-conversion luminescent materials can convert infrared light into visible light, so they are expected to be used in display, red light detection and camouflage, optical storage, etc. (Related literature: J.Phys.Chem.B 2004, 108, 19205; 2005, 123, 174710; patent CN200710009067.1). Up-conversion luminescent nanocrystals are also considered to be a good biological calibration material, which can track and determine biomolecules such as DNA, RNA, and protein, and can be used in medical fields such as immunity, diagnosis, and treatment (relevant literature: Nano lett. 2004, 4 , 2191; Adv. Mater. 2005, 17, 2119). Biomolecules do not absorb the commonly used 980nm infrared laser, that is to say, biomolecules are...

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Problems solved by technology

[0003] Rare earth ion Er 3+ , Tm 3+ and Ho 3+ Under the excitation of ultraviolet light, green light, blue light, and red light can be emitted respectively, but since the maximum excitation peaks of the three ions in the ultraviolet region are not at the same position, no matter whether the three ions are mixed with Er 3+ , Tm 3+ and Ho 3+ The luminescent material is still doped with Er in the same material at the same time 3+ , Tm 3+ and Ho 3+ , cannot obtain white light by using ultraviolet excitation through down-conversion

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