Tb<3+>-activated barium strontium fluoborate green fluorescent powder, preparation and application thereof

Abstract

The invention discloses Tb<3+>-activated activated barium strontium fluoborate green fluorescent powder as well as preparation and application thereof. The general chemical formula of the fluorescentpowder is Ba<3-x>Tb<x>Sr2B4O10F2, wherein x is the substitution molar ratio of Tb<3+> to Ba<2+>, and x is greater than or equal to 0.005 and less than or equal to 0.35. The method comprises the following steps: (1) preparing fluorine-free barium strontium borate precursor powder Ba<2-x>TbxSr2B4O10 by using a chemical sol-gel method; and (2) adding barium fluoride and ammonium fluoride into the prepagreen fluorine-free barium strontium borate precursor powder, fully mixing all the components, tabletting the mixture, and then preparing the Tb<3+>-activated barium strontium fluoborate green luminescent fluorescent powder Ba<3-x>Tb<x>Sr2B4O10F2 through solid-phase sintering. The green fluorescent powder is in a pure phase and uniform in particle, can emit green light with the central wavelength of 545 nanometers under excitation of near ultraviolet light 276 nanometers, and is high in luminous intensity and good in thermal stability; therefore, the green fluorescent powder can be used forpreparing an illumination or display device taking near ultraviolet light as an excitation light source.

Description

technical field [0001] The invention relates to the field of inorganic fluorescent materials and display technology, in particular to a Tb 3+ Activated barium strontium fluoroborate green phosphor and its preparation and application. Background technique [0002] In recent years, based on the innovation and development of semiconductors, blue light and near-ultraviolet light semiconductor chips have been applied, lighting and display have been revolutionized, and white light-emitting diodes based on phosphors activated by rare earth ions have realized solid-state lighting, forming today's Compared with traditional fluorescent lamps, energy-saving lighting and other light sources, mainstream commercialized white LED lighting devices, the rapidly developing new generation of lighting based on LED chips has many advantages of environmental protection, low power consumption, safety and high brightness. [0003] Today's most important lighting is made of blue semiconductor chips...

AI Technical Summary

Problems solved by technology

[0003] Today's most important lighting is made of blue semiconductor chips and yellow Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) Phosphor powder combined package, this kind of lighting has many advantages, but this kind of lighting also has inevitable disadvantages: insufficient red light emission in lighting luminescence, color temperature (CCT>4500K) and color rendering index (Ra <80 ) is poor, these shortcomings largely limit its application in general lighting

[0004] At present, green phosphors based on barium strontium fluoroborate have not been reported yet.

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