A tb3+ activated barium strontium fluoroborate green phosphor and its preparation and application

Abstract

The invention discloses a Tb 3+ Activated barium strontium fluoroborate green fluorescent powder and its preparation and application, the general chemical formula of the fluorescent powder is Ba 3‑x Tb x Sr 2 B 4 o 10 f 2 , where x is Tb 3+ Replace Ba 2+ The molar ratio of 0.005≤x≤0.35; the preparation steps are: (1) using the chemical sol-gel method to prepare the fluorine-free strontium barium borate precursor powder Ba 2‑x Tb x Sr 2 B 4 o 10 (2) In the prepared fluorine-free strontium barium borate precursor powder, add barium fluoride and ammonium fluoride, fully mix, and mix the mixture, use solid-state sintering method to prepare, obtain a kind of Tb 3+ Activation of barium strontium fluoroborate green luminescent phosphor Ba 3‑x Tb x Sr 2 B 4 o 10 f 2 . The green fluorescent powder prepared by the present invention is a pure phase with uniform particles, and emits green light with a center wavelength of 545 nanometers under the excitation of near-ultraviolet light at 276 nanometers. lighting or display devices.

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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