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

A technology of luminescent glass and ceramics, applied in glass molding, glass manufacturing equipment, luminescent materials, etc., can solve the problems of increasing the difficulty and cost of preparation, and achieve the effect of reducing the probability of erosion, high thermal conductivity, and stable properties

Active Publication Date: 2018-08-28
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the mole percentage of each raw material in the silicate red luminous glass powder, according to 60% SiO 2 , 20% Na 2 CO 3 , 9% Al 2 o 3 , 6% CaO, 5% Eu 2 o 3 Fully mix the proportions, place in a high-temperature box-type resistance furnace, heat up to 1300°C at 5°C / min, keep warm for 3 hours, cool to room temperature with the furnace, and grind to obtain silicate red luminescent glass powder.

[0038] According to glass powder and Sr 4 al 14 o 25 :Eu 2+ The mass percentage of phosphor powder is 100:0, mixed thoroughly, pressed into tablets under 20MPa pressure, placed in a high-temperature box-type resistance furnace, heated to 680°C at 5°C / min for sintering for 0.5h, then cooled to room temperature with the furnace, after After grinding and polishing, a luminescent glass ceramic is obtained.

[0039] The obtained luminescent glass ceramics are directly covered on the ultraviolet luminescent chip with an emission wavelength of 385nm, and the hig...

Embodiment 2

[0041] According to the mole percentage of each raw material in the silicate red luminous glass powder, according to 60% SiO 2 , 20% Na 2 CO 3 , 9% Al 2 o 3 , 6% CaO, 5% Eu 2 o 3 Fully mix the proportions, place in a high-temperature box-type resistance furnace, heat up to 1300°C at 5°C / min, keep warm for 3 hours, cool to room temperature with the furnace, and grind to obtain silicate red luminescent glass powder.

[0042] According to glass powder and Sr 4 al 14 o 25 :Eu 2+ The mass percentage of the phosphor powder is 99.9:0.1, mixed thoroughly, pressed into tablets under a pressure of 20MPa, placed in a high-temperature box-type resistance furnace, heated to 680°C at 5°C / min for sintering for 0.5h, and then cooled to room temperature with the furnace. After grinding and polishing, the luminous glass ceramics are obtained.

[0043] The obtained luminescent glass ceramics are directly covered on the ultraviolet luminescent chip with an emission wavelength of 385nm, ...

Embodiment 3

[0045] According to the mole percentage of each raw material in the silicate red luminous glass powder, according to 60% SiO 2 , 20% Na 2 CO 3 , 9% Al 2 o 3 , 6% CaO, 5% Eu 2 o 3 Fully mix the proportions, place in a high-temperature box-type resistance furnace, heat up to 1300°C at 5°C / min, keep warm for 3 hours, cool to room temperature with the furnace, and grind to obtain silicate red luminescent glass powder.

[0046] According to glass powder and Sr 4 al 14 o 25 :Eu 2+ The mass percentage of phosphor powder is 99.7:0.3, mixed thoroughly, pressed into tablets under 20MPa pressure, placed in a high-temperature box-type resistance furnace, heated to 680°C at 5°C / min for sintering for 0.5h, then cooled to room temperature with the furnace, after After grinding and polishing, the luminous glass ceramics are obtained.

[0047] The obtained luminescent glass ceramics are directly covered on the ultraviolet luminescent chip with an emission wavelength of 385nm, and the...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80C03C10/04C03C1/00C03C4/12C03B19/06H01L33/52H01L33/50
CPCC03B19/06C03C1/00C03C4/12C03C10/0009C09K11/773H01L33/502H01L33/52Y02B20/00
Inventor 雷炳富邓建昆张浩然刘应亮肖勇郑明涛董汉武
Owner SOUTH CHINA AGRI UNIV
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