Double-perovskite type near-infrared luminescent material and preparation method thereof

Abstract

The invention discloses a double perovskite type near-infrared luminescent material, the chemical composition is Rb2NaY (1-x) F6: xCr < 3 + >, x is the mole percentage coefficient of doped chromium ions relative to yttrium ions, and 0 lt; x is greater than or equal to 0.15; the preparation method comprises the following steps: (1) weighing 80-85 parts of rubidium fluoride, 15-20 parts of sodium fluoride, 55-40 parts of yttrium fluoride and 0-6 parts of chromium fluoride; (2) adding the weighed rubidium fluoride, sodium fluoride, yttrium fluoride and chromium fluoride into a mortar, and grinding for more than 30 minutes to fully and uniformly mix the raw materials; and (3) putting the ground raw materials into a tubular furnace, and reacting at the high temperature of 650-700 DEG C for 8-10 hours to obtain the product. The luminescent material capable of emitting near-infrared light is prepared by taking positive trivalent transition metal Cr < 3 + > as doping ions and double perovskite fluoride as a matrix.

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials, and more specifically relates to a double perovskite type near-infrared luminescent material and a preparation method thereof. Background technique [0002] Halide double perovskite, general formula A 2 B I B III x 6 (A and B I =Cs, Rb, Ag, K, Na, Li, etc.; B III = Al, Ga, In, Sc, etc.; X = F, Cl, Br or I), which is a dioctahedral symmetric structure derived on the basis of halide lead-based perovskite ([B I x 6 ] and [B III x 6 ]) Alternate arrangement, stable chemical properties, long carrier lifetime, non-toxic, all-inorganic semiconductor materials with excellent photoelectric properties. Double perovskite-type inorganic compounds have stable crystal structure, excellent photoelectric performance, and various synthesis methods. When applied in the field of light emission, they have broad emission peaks, adjustable band gap width, and low cost, so they have attr...

AI Technical Summary

Problems solved by technology

At present, the research and development of broadband near-infrared light sources cannot meet all application requirements due to low conversion efficiency, low output power, and not wide emission band. One of the ways to solve the above problems lies in the development of new high-efficiency broadband near-infrared phosphors.

Images