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A kind of yellow afterglow glass-ceramic for ac-led and preparation technology thereof

A glass-ceramic and afterglow technology, applied in the field of solid luminescent materials, can solve the problems of reducing the service life of high-power LEDs, prone to yellowing, poor heat resistance and radiation resistance, etc.

Active Publication Date: 2021-12-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has the problem that the packaged organic polymer material has poor heat resistance and radiation resistance, and is prone to yellowing, which seriously reduces the service life of high-power LEDs.

Method used

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  • A kind of yellow afterglow glass-ceramic for ac-led and preparation technology thereof
  • A kind of yellow afterglow glass-ceramic for ac-led and preparation technology thereof
  • A kind of yellow afterglow glass-ceramic for ac-led and preparation technology thereof

Examples

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Effect test

example 1

[0071] Example 1: Analytical pure SiO 2 、Al 2 o 3 、Gd 2 o 3 , Ga 2 o 3 , B 2 o 3 、Na 2 CO 3 , ZrO 2 、TiO 2 , CeO 2 and Bi 2 o 3 Powder, according to 15SiO 2 :20Al 2 o 3 :14.98Gd 2 o 3 :14.99Ga 2 o 3 :10B 2 o 3 :10Na 2 CO 3 :2.5ZrO 2 :2.5TiO2 2 :0.04CeO 2 :0.01Bi 2 o 3 The ratio (molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1500°C and kept for 2 hours to melt, and then the glass The melt was taken out and quickly poured into a mold to form it, and then placed in a resistance furnace for annealing at 750°C for 2 hours to eliminate internal stress, thereby obtaining a bulk precursor glass. Put the obtained precursor glass into a resistance furnace and heat it to 1000°C, then perform isothermal heat treatment for 2 hours to make it partly crystallized, and obtain a Gd-containing 3 Al 2 Ga 3 o 12 : Ce, Bi crystalline bulk gl...

example 2

[0073] Example 2: Analytical pure SiO 2 、Al 2 o 3 , Y 2 o 3 , Ga 2 o 3 , B 2 o 3 、K 2 CO 3 , ZrO 2 , CeO 2 and Cr 2 o 3 Powder, according to 20SiO 2 :25Al 2 o 3 :11.99Y 2 o 3 :18.99Ga 2 o 3 :5B 2 o 3 :15K 2 CO 3 :5ZrO 2 :0.02CeO 2 :0.01Cr 2 o 3 (Molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1600°C and kept for 3 hours to melt, then, the glass The melt is taken out and quickly poured into a mold for forming, and then placed in a resistance furnace for annealing at 800°C for 2 hours to eliminate internal stress, thereby obtaining a bulk precursor glass. Put the obtained precursor glass into a resistance furnace and heat it to 1100°C, then perform isothermal heat treatment for 4 hours to make it partly crystallized, and obtain the Y-containing 3 al 2 Ga 3 o 12 : Ce, Cr crystal phase bulk glass-ceramics. Under the excitation ...

example 3

[0074] Example 3: Analytical pure SiO 2 、Al 2 o 3 、Lu 2 o 3 , Ga 2 o 3 , B 2 o 3 , Li 2 CO 3 、TiO 2 , CeO 2 and Cr 2 o 3 Powder, according to 15SiO 2 :30Al 2 o 3 :19.99Lu 2 o 3 :9.99Ga 2 o 3 :12B 2 o 3 :8Li 2 CO 3 :5TiO 2 :0.02CeO 2 :0.01Cr 2 o 3 The ratio (molar ratio) is accurately weighed and placed in an agate ball mill jar, mixed and ground evenly, placed in a platinum crucible, placed in a resistance furnace, heated to 1400°C, and kept for 5 hours to melt it. Then, the glass The melt is taken out and quickly poured into a mold for forming, and then placed in a resistance furnace for annealing at 650°C for 3 hours to eliminate internal stress, thereby obtaining a bulk precursor glass. Put the obtained precursor glass into a resistance furnace and heat it to 900°C, then perform isothermal heat treatment for 3 hours to make it partly crystallized, and obtain a glass containing Lu 3 al 2 Ga 3 o 12 : Ce, Cr crystal phase bulk glass-ceramics. U...

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Abstract

The present invention proposes a kind of Ln that can realize high-efficiency blue light excitation and yellow light afterglow emission. 3 al 2 Ga 3 o 12 : Ce, R (Ln=Y, Gd, one of Lu; R=Cr, one of Bi) glass ceramics and its preparation method. The glass-ceramics uniformly embedded Ln in the oxide glass matrix 3 al 2 Ga 3 o 12 : Ce, R fluorescent microcrystals. The glass-ceramic emits yellow light upon excitation with blue light; after excitation ceases, a bright yellow afterglow emission occurs. Driven by alternating current, the stroboscopic depth of the AC-LED prototype device based on glass-ceramics is only 49.5%, which can be developed and applied to new high-power remote white AC-LEDs.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to a yellow afterglow glass-ceramic which can be applied to alternating current (AC) LEDs and a preparation process thereof. technical background [0002] At present, most high-power white LED lighting products on the market need to use AC-DC converters to convert the mains power into DC power to drive LED loads. Due to the high power loss (15-30%) of the AC-DC converter, the electrolytic capacitor in the device is easy to be damaged (the life span is generally less than 10,000 hours), the price is high, and the size is large, which greatly restricts the LED device system. Efficiency, actual service life, cost and appearance design. Obviously, if the AC-LED can be directly driven by alternating current, the above problems can be better solved. Related products have incomparable advantages over traditional DC-LED in many fields such as residential lighting, street lighting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/02C03C4/12
CPCC03C4/12C03C10/0054
Inventor 林航王元生徐桔
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI