a kind of dy 3+ Activated strontium barium fluoroborate yellow phosphor and its preparation and application

Abstract

The invention discloses a Dy 3+ Activation of strontium barium fluoroborate yellow fluorescent powder and its preparation and application, the general chemical formula of the fluorescent powder is Ba 3‑x Dy x Sr 2 B 4 o 10 f 2 , x is Dy 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 Dy 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 Dy 3+ Activate strontium fluoroborate barium yellow luminescent phosphor Ba 3‑ x Dy x Sr 2 B 4 o 10 f 2 . The yellow fluorescent powder prepared by the present invention is a pure phase with uniform particles, and emits yellow light with a center wavelength of 576 nm under the excitation of near-ultraviolet light at 390 nm. It 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 Dy 3+ Activated strontium barium fluoroborate yellow phosphor and its preparation and application. Background technique [0002] In recent years, based on the innovation and development of semiconductors, blue and near-ultraviolet semiconductor chips have been applied, and lighting and display have been revolutionized. White light-emitting diodes based on rare earth ion-activated phosphors have achieved solid-state lighting, forming the current Mainstream commercialized white LED lighting devices. Compared with traditional fluorescent lamps, energy-saving lighting and other light sources, 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 and yello...

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 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] Yellow phosphor based on barium strontium fluoroborate has not been reported

Images