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Fluorescent powder for GaN base light-emitting diode and production method thereof

A technology of light-emitting diodes and phosphors, applied in the direction of light-emitting materials, chemical instruments and methods, etc., can solve the problems of different excitation wavelengths that cannot meet UV-LEDs, etc., and achieve high energy conversion rates and simple and convenient synthesis methods

Inactive Publication Date: 2004-08-18
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing fluorescent powders that can be used for excitation by purple tubes (UV-LEDs), such as fluorescent powders used in high-pressure mercury lamps, cannot meet the needs of UV-LEDs in terms of excitation wavelengths; Quite different from UV-LED due to its mercury content and temperature

Method used

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  • Fluorescent powder for GaN base light-emitting diode and production method thereof
  • Fluorescent powder for GaN base light-emitting diode and production method thereof
  • Fluorescent powder for GaN base light-emitting diode and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment one: [(Sr 0.99 Eu 0.01 )S](Ga 2 S 3 )Synthesis:

[0013] SrCO 3 (analytical pure) 4.3846 grams;

[0014] Ga 2 o 3 (4N) 5.6232 grams;

[0015] Eu 2 o 3 (4N) 0.0528 g.

[0016] After the above materials were ground and mixed in an agate mortar, they were put into a corundum crucible, and the 2 Burn at 800°C in S atmosphere, the burning time is not less than 1 hour, take it out after cooling, crush and sieve to obtain a green powder, which emits green light under the excitation of 250nm to 500nm light. Its X-ray spectrum is shown in figure 1 , the emission spectrum see figure 2 .

Embodiment 2

[0017] Embodiment two: [(Sr 0.96 Eu 0.02 T m 0.02 )S](Ga 2 S 3 )Synthesis:

[0018] SrCO 3 (analytical pure) 1.4172 grams;

[0019] Ga 2 o 3 (4N) 1.8744 grams;

[0020] Eu 2 o 3 (4N) 0.0352 grams;

[0021] T m 2 o 3 (4N) 0.0386 g.

[0022] After the above materials were ground and mixed in an agate mortar, they were put into a corundum crucible, and the 2 Burn at 800°C in S atmosphere, the burning time is not less than 1 hour, take it out after cooling, crush and sieve to obtain a green powder, which emits green light under the excitation of 250nm to 500nm light.

Embodiment 3

[0023] Embodiment three: [(Ca 0.9 Eu 0.1 )S](Ga 2 S 3 ) 1.25 Synthesis:

[0024] CaCO 3 (analytical pure) 3.6024 grams;

[0025] Ga 2 o 3 (4N) 9.3728 grams;

[0026] Eu 2 o 3 (4N) 0.7038 g.

[0027] After the above materials were ground and mixed in an agate mortar, they were put into a corundum crucible, and the 2 Burn at 850°C in S atmosphere, the burning time is not less than 1 hour, take out after cooling, crush and sieve to obtain a yellow powder, which emits yellow light when excited by 250nm to 520nm light. Its emission spectrum is shown in image 3 .

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Abstract

The present invention relates to a fluorescent powder for preparing GaN base light-emitting diode (LED). Said fluorescent powder is a composite sulfide. Said invention provides its general formula, and its raw material composition and preparation method. Said fluorescent powder can be excited by 300nm-500 nm (specially 400nm-470 nm) light so as to give out 510 nm-650 nm light, and can be used for preparing green or white GaN base LED light-emitting diode with high luminosity.

Description

technical field [0001] The invention relates to a fluorescent powder for a GaN-based light-emitting diode and a preparation method thereof. Background technique [0002] GaN-based light-emitting diode (Light Emitting Diode) is a new type of light-emitting device, which has the advantages of small size, long life, low power consumption, and no need to use mercury that pollutes the environment. It can be widely used in various lighting facilities, including Indoor lights, traffic lights, traffic lights, street lights, car tail lights, direction lights, brake lights, large outdoor screens, display screens and advertising boards, etc., are gradually replacing the functions of various light bulbs. This new type of green light source will surely become a new generation of lighting source in the 21st century, which is of great significance to energy saving, environmental protection, and improvement of people's quality of life. At present, there are not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/84
Inventor 苏锵徐剑张剑辉
Owner SUN YAT SEN UNIV