A kind of luminescent glass ceramics and its preparation method and application in LED lighting devices

Abstract

The present invention belongs to the field of inorganic luminescent materials and discloses a luminescent glass ceramic and a preparation method therefor and a use thereof in an LED illumination device. The luminescent ceramic is composed of a silicate red luminescent glass powder and Sr4Al14O25:Eu2+ in a mass ratio of 100:0 - 99.1:0.9, wherein the silicate red luminescent glass powder is composed of the following components, by molar fraction, 50% - 60% of SiO2, 20% - 30% of Na2CO3, 9% of Al2O3, 6% of CaO and 5% of Eu2O3. Since the emission wavelength range of the fluorescent powder used covers 450 - 550 nm, and a precursor glass powder can provide a red light portion at the same time, a luminescent glass ceramic obtained therefrom can obtain a warm white light under excitation of an ultraviolet chip at 385 nm. By regulating and controlling a ratio of the fluorescent powder to the glass powder, the types of the warm white light are also slightly different, and the type of field and the application range of luminescent materials are broadened.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials, and in particular relates to a luminescent glass ceramic and its preparation method and application in LED lighting devices. Background technique [0002] At present, solid-state lighting is widely respected due to its low pollution, resource saving and long life, and the most widely used in the market is blue light GaN chip and Ce 3+ : White light LED encapsulated by YAG phosphor powder. For the first time, this type of white LED tends to have a relatively high color temperature (>5000K), which can easily cause eye fatigue under long-term lighting, which is not conducive to lighting in general life. Secondly, the common packaging method in the market is to directly mix phosphor powder with epoxy resin and then coat it on the blue chip. Although this method is simple, the light emitted by the product is prone to chromatic aberration after being used for a period of time. This i...

AI Technical Summary

Problems solved by technology

However, just changing the packaging material from epoxy resin to glass ceramics does not change the disadvantages of colder light and high color temperature.

To solve this problem, most of the literature reports are to add red phosphor to it to improve its color temperature, which undoubtedly increases the difficulty and cost of preparation.

Images