Near ultraviolet excitated blue luminescent glass ceramic and preparation thereof

Abstract

The invention discloses near ultraviolet laser blue luminescent glass ceramic, which is oxyfluoride glass ceramic doped by bivalent europium ion comprising the following components in mol percentage: 45 to 60 percent of SiO2, 0 to 25 percent of Al2O3, 0 to 10 percent of Na2O, 0 to 10 percent of NaF, 0 to 20 percent of ZnF2, 10 to 50 percent of BaF2, 0.5 to 10 percent of EuF3, and 0 to 3 percent of clarificant and/or fluxing agent. A preparation method comprises processes of high-temperature melting in a reducing atmosphere and crystallization heat treatment, wherein trivalent europium ion is reduced to the bivalent europium ion. The method is simple, has no pollution and has low cost. The glass ceramic has wide excitation spectra in a near ultraviolet region (between 350 and 420 nanometers), can produce blue luminescence under excitation of GaInN near ultraviolet light LED, and has the characteristics of high luminosity, ultraviolet radiation resistance, and good chemical stability and thermal stability.

Description

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AI Technical Summary

Benefits of technology

This patented technology simplifies making green or yellow colored crystals for use in electronic devices such as displays that produce visible colors when exposed to sunlight during daytime hours. It also improves their efficiency at generating shortwave infrared signals used for communication purposes. Additionally, this new method allows for efficient production of long wave fluorescent lamps called quantum dots made from rare earth elements like yttrium aluminum garnet.

Problems solved by technology

This patented describes different ways to improve the properties of semiconductive material called silicate glasses or crystal sapphire which may help create better colored lights when excited from UV rays. These improvements include improved brightness, reduced dark current at longer periods, increased durability against damage caused by external factors like sunlight exposure, heat dissipating ability during use without losing their effectiveness overtime, less sensitivity towards ambient temperatures compared to traditional bulbs made up mostly of other colors, lower costs associated with production processes, ease of handling, etc., making them suitable for replacing conventional lightings. Additionally, there exist methods to achieve higher quantum yields than previously achievable through laser technology.

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