Ultraviolet-ray-excited SrMgAl10O17:Eu<2+>,Mn<2+> blue-green fluorescent powder

Abstract

The invention discloses an ultraviolet-ray-excited SrMgAl10O17:Eu<2+>,Mn<2+> blue-green fluorescent powder. According to the blue-green fluorescent powder, SrMgAl10O17 is used as a matrix and codoped with Eu<2+> and Mn<2+>; and under the excitation of 280-400nm violet rays, the blue-green fluorescent powder can emit 420-540nm blue-green visible light. The fluorescent powder color coordinates can be regulated within the range of (0.1477,0.1435) blue light and (0.1084,0.7443) green light by regulating the doping contents of the Eu<2+> and Mn<2+>. The blue-green fluorescent powder is prepared mainly by a low-temperature combustion method. The method comprises the following steps: sufficiently grinding and mixing reagents nitrate, Eu2O3, MnCO3, urea and boric acid in an agate mortar; and combusting the uniform mixture in a muffle furnace with the initial furnace temperature of 400-800 DEG C for 1-2 minutes, keeping the temperature for 1-30 minutes, taking out, cooling, and grinding to obtain the SrMgAl10O17:Eu<2+>,Mn<2+> blue-green fluorescent powder. The method has the advantages of simple technique, no pollution, low synthesis temperature, short reaction time, low cost and low energy consumption; and the prepared fluorescent powder has favorable crystallinity and luminescent intensity, and can be well applied to a white-light LED (light-emitting diode) light source.

Description

technical field [0001] The invention relates to a blue-green fluorescent powder, in particular to a SrMgAl excited by ultraviolet rays 10 o 17 : Eu 2+ , Mn 2+ A blue-green fluorescent powder belongs to the technical field of fluorescent powder preparation. Background technique [0002] White light-emitting diode (Light Emitting Diode, LED), as a new type of solid light source, has many advantages such as energy saving, environmental protection, long life, small size, etc. It shows great application prospects in indoor lighting, liquid crystal display and backlight. Currently, the most mature phosphor used in white LED products is YAG:Ce 3+ , which is coated on an InGaN blue light emitting chip with a wavelength of 460nm, and the blue light excites YAG: Ce 3+ Phosphor powder emits yellow light, and blue light and yellow light mix to form white light. However, due to the lack of red light radiation, the product has disadvantages such as low color rendering index and poor...

AI Technical Summary

Problems solved by technology

At present, the commonly used three primary color phosphors mainly include red phosphor Y 2 o 3 S: Eu 3+ , blue phosphor BaMgAl 10 o 17 : Eu 2+ , green phosphor ZnS:Cu + ,Al 3+ etc., but the excitation spectrum of the phosphor powder used for near-ultraviolet LEDs is not well matched with the emission spectrum of near-ultraviolet LEDs, and adding blue-green components to the existing three-color phosphors is more conducive to improving Color rendering index of white LED

In addition, the traditional preparation method is also relatively simple, mainly using high-temperature solid-phase method, the particle size of the phosphor synthesized by this method is relatively coarse and uneven, and it can be used only after ball milling

However, the crystal form of the ball-milled particles is destroyed, and the indicators such as luminous brightness, luminous efficiency and secondary performance all decrease to varying degrees.

At the same time, the high-temperature solid-phase method also has the disadvantages of long production cycle and high cost.

Images