a kind of EU 3+ Activated barium strontium fluoroborate red phosphor and its preparation and application

Abstract

The invention discloses a Eu 3+ Activated strontium barium fluoroborate red phosphor powder and its preparation and application, the chemical formula of the phosphor powder is Ba 3‑x Eu x Sr 2 B 4 o 10 f 2 , where x is Eu 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 Eu 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 Eu 3+ Activation of barium strontium fluoroborate red luminescent phosphor Ba 3‑x Eu x Sr 2 B 4 o 10 f 2 . The red fluorescent powder prepared by the present invention is a pure phase with uniform particles, emits red light with a central wavelength of 615 nm under excitation of near-ultraviolet light at 395 nm, has high luminous intensity and good thermal stability, and can be used to prepare near-ultraviolet light as an excitation light source 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 Eu 3+ Activated strontium barium fluoroborate red 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 a...

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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 combination 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, the commercial red phosphor powder for LED is mainly Y 2 o 2 S:Eu 3+ , the red fluorescent powder is a sulfide, because sulfide is used as a raw material in the preparation process, and it needs to be calcined under a protective atmosphere or a reducing atmosphere to prevent sulfur from reacting with oxygen in the air. The preparation method is very complicated; sulfide The system efficiency is low, the chemical stability is poor, and it is easy to generate H 2 S gas corrodes LED chips

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