Blue-violet light excited 660-nanometer red fluorescent material and high-temperature microwave preparation method thereof

Abstract

Disclosed is a blue-violet light excited 660-nanometer red fluorescent material, chemical formula Ba1.74Sr0.35Ca0.75MgSi2O8:0.06Eu2+, 0.1Mn2+, wherein the Eu2+ and the Mn2+ are luminescent central components and are 6%mol and 10%mol in doping concentration respectively. A preparation method of the blue-violet light excited 660-nanometer red fluorescent material includes: accurately weighing raw materials prior to mixing, and adding ethanol for mixing until mixed into slurry; and rising or dropping the interior temperature of a high temperature microwave oven with a frequency 2.45GHz according to set rising and dropping curved lines. The blue-violet light excited 660-nanometer red fluorescent material has the advantages that the material capable of absorbing microwave energy with the frequency 2.45GHz at high temperature is high in product purity and light efficiency, a prepared lighting system is capable of emitting 660-nanometer red light and 450-nanometerblue light, the material is used for making ecological LEDs and warm white LEDs, and the material is low in cost of raw materials, simple in process, energy-saving, environment-friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of semiconductor optoelectronic materials and devices, in particular to a 660nm red fluorescent material excited by blue-violet light and a high-temperature microwave preparation method. Background technique [0002] There are three main ways to use LEDs to achieve white light: 1) Assembling red, green, and blue primary color chips together to achieve white light; 2) Combining blue LED chips and yellow phosphor YAG: Ce to form white LEDs; 3) Using near-ultraviolet LEDs The near-ultraviolet light emitted by the chip excites red, green, and blue three primary color phosphors to obtain white light. The first and third methods cannot be applied on a large scale due to too complicated design circuits or lack of suitable phosphors or chips. The combination of blue LED chip and yellow phosphor YAG: Ce has become the mainstream white LED product due to its early application and research, mature preparation process and stable...

AI Technical Summary

Problems solved by technology

But this method has a big defect: due to the lack of red light in its spectrum, the color rendering index of its packaged LED products is low, and it is generally difficult to exceed 75, which has attracted widespread attention.

However, nitrides have very strict requirements on the preparation environment (high temperature: 1700°C-1800°C, N 2 : 1-5 MPa), consumes a lot of energy, there are many unsafe factors in the preparation process, and the follow-up processing is very complicated

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