Ultraviolet / violet light excited blue fluorescent material, preparation method and application thereof

CN120098641BActive Publication Date: 2026-06-23SHANGHAI INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI INST OF TECH
Filing Date
2025-02-26
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing white LED technology, the different light decay of the three primary color chips leads to unstable color temperature, complex control circuits and high cost. When InGaN blue light chips are combined with yellow phosphors, the blue light part is too strong, resulting in uneven luminous intensity, low color rendering index and blue light hazards.

Method used

A blue fluorescent material BaHfSi2O7:xEu2+ based on an oxide doped with Eu2+ was developed. Its excitation spectrum ranges from 200 to 450 nm, and its emission spectrum ranges from 390 to 680 nm. It can emit blue light with a center wavelength of 472 nm under near-ultraviolet light excitation at 304 nm and is prepared by conventional solid-state reaction method.

Benefits of technology

It achieves high-efficiency blue light emission with an internal quantum efficiency of up to 83.67%. The emission intensity remains at 80% of the initial room temperature intensity at 150℃. It is suitable for white LEDs, solar-like LEDs, full-spectrum LEDs, and healthy lighting LEDs, avoiding low color rendering index and blue light hazards.

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Abstract

The application relates to a kind of ultraviolet / violet excitation blue fluorescent material and its preparation method and application.It is Eu 2+ Doped oxide-based blue fluorescent material, chemical formula is BaHfSi2O7:xEu 2+ Wherein, 0.003<=x<=0.02.Compared with the prior art, the violet excitation blue fluorescent material provided by the application is a kind of new, never reported ultraviolet excitation Eu 2+ Doped oxide-based 472nm blue light emitting fluorescent powder, the fluorescent powder has a wide excitation band, the excitation spectrum range covers 200-450nm, the emission spectrum range covers 390-680nm, the fluorescent material emits blue light with the center wavelength located at 472nm under the excitation of 304nm near ultraviolet light, and simultaneously has excellent stability and luminous efficiency.The fluorescent powder can be prepared by conventional solid-phase reaction method, has the characteristics of simple preparation process and easy industrial production, can be combined with near-ultraviolet chip to produce white light, can be widely used as a good candidate material for white LED, and can meet the urgent needs of current healthy lighting LED light source.
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