Rare earth doped fluorescent powder and synthetic method thereof and application of fluorescent powder in LED devices

A technology of rare earth doping and phosphor, which is applied in the field of rare earth doping phosphor and synthesis, which can solve the problems of reducing the fluorescent performance of phosphor, and achieve the effects of high luminous efficiency, high chemical stability, and high thermal quenching temperature

Active Publication Date: 2016-10-26
BEIJING YUJI SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its disadvantage is that this method is easy to generate impurity phases, and the obtained powders are agglomerated, and the broken agglomerations will reduce the fluorescence performance of the phosphors.

Method used

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  • Rare earth doped fluorescent powder and synthetic method thereof and application of fluorescent powder in LED devices
  • Rare earth doped fluorescent powder and synthetic method thereof and application of fluorescent powder in LED devices
  • Rare earth doped fluorescent powder and synthetic method thereof and application of fluorescent powder in LED devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Reaction raw materials 35.24g barium carbonate, 2.96g strontium carbonate, 0g calcium carbonate, 5.64g silicon dioxide, 15.24g silicon nitride, 0.24g europium oxide and 0.01g high-purity graphite powder were placed in a ceramic mortar and ground and mixed for 30min to obtain a mixture , put the mixture through a 100-mesh sieve and put it into an alumina crucible for calcination in a horizontal tube furnace. During the calcination process, nitrogen-hydrogen mixed gas (hydrogen content 10%) was introduced, the gas flow rate was 0.3L / min, and the temperature was raised to 1490°C at a heating rate of 8°C / min. After holding for 8 hours, the temperature was lowered at a rate of 10°C / min. The temperature was lowered to 700°C and then cooled to room temperature with the furnace. The obtained product is lightly ground and passed through a 120-mesh sieve to obtain blue-green fluorescent powder (BaSr)Si 2 o 2 N 1.996 C 0.003 :Eu 2+ . figure 1 The middle curve 1 is the (BaSr)...

Embodiment 2

[0104] Reaction raw materials 64.68g barium carbonate, 9.31g silicon dioxide, 25.14g silicon nitride, 0.40g europium oxide, 1.12g potassium carbonate and 0.015g high-purity graphite powder are placed in ceramic mortar and grind and mix for 30min to obtain the mixture, and the mixture is passed 100-mesh sieve and put into alumina crucible for calcination in horizontal tube furnace. During the calcination process, nitrogen-hydrogen mixed gas (hydrogen content 10%) was introduced, the gas flow rate was 0.3L / min, the temperature was raised to 1510°C at a heating rate of 8°C / min, and after 8 hours of heat preservation, the temperature was lowered at a rate of 10°C / min The temperature was lowered to 700°C and then cooled to room temperature with the furnace. The obtained product is lightly ground and passed through a 120-mesh sieve to obtain the blue-green fluorescent powder BaSi 2 o 2 N 1.996 C 0.003 :Eu 2+ . figure 2 The middle curve 2 is the excitation and emission spectru...

reference example 1

[0106] The reaction raw materials 64.68g barium carbonate, 9.31g silicon dioxide, 25.14g silicon nitride, 0.40g europium oxide, and 1.12g potassium carbonate were placed in a ceramic mortar and ground and mixed for 30 minutes to obtain a mixture. Calcination was carried out in a horizontal tube furnace in aluminum crucibles. During the calcination process, nitrogen-hydrogen mixed gas (hydrogen content 10%) was introduced, the gas flow rate was 0.3L / min, the temperature was raised to 1510°C at a heating rate of 8°C / min, and after 8 hours of heat preservation, the temperature was lowered at a rate of 10°C / min The temperature was lowered to 700°C and then cooled to room temperature with the furnace. The obtained product is lightly ground and passed through a 120-mesh sieve to obtain blue-green phosphor (BaEu)Si 2 o 2 N 2 . figure 2 Curve 1 is the excitation and emission spectra of the sample.

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Abstract

The invention discloses rare earth doped fluorescent powder and a synthetic method thereof and application of the fluorescent powder in LED devices, and belongs to the technical field of luminescent materials. The general chemical formula of the fluorescent powder is MS[2-y]AyO[2+y]N[2-y-4z/3]Cz:Rx. According to the compound, C<4-> is substituted for N<3->, due to the fact that the electronegativity of C is smaller than that of N, the electron cloud expansion effect of the C<4-> is more obvious than that of the N<3->, after doping is conducted, rare earth ion 5d energy level splitting is increased, Stokes shift can change, and fluorescence parameters such as fluorescent peal and full half-peak width of the powder change. By adjusting generation of the above-mentioned doped ions, fluorescent powder with different fluorescent light colors and quantum efficiency can be obtained. The invention further discloses the application of the fluorescent powder in the field of LED devices. The fluorescent powder is applied to white LED light fixtures or light-emitting components which take blue LED or purple LED as a light source and can help to increase the color rendering indexes of the devices.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a rare-earth-doped phosphor, a synthesis method, and an application in LED devices. Background technique [0002] White light LEDs using cold light have many advantages such as low energy consumption, high electro-optical conversion efficiency, long life, high brightness, small size, no pollution to the environment, and fast response. They are considered to replace traditional lighting tools such as incandescent lamps and fluorescent lamps. Power-saving and environmentally friendly new lighting sources have been widely used in various lighting fields such as lighting, traffic signals, backlights, lasers, communications, automobiles, instruments, plant cultivation, and decoration. [0003] Phosphor plays a decisive role in solid-state lighting LED technology, and its performance determines key technical parameters such as luminous spectrum, luminous efficiency, color...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/79C09K11/80H01L33/50
CPCC09K11/0883C09K11/7734C09K11/7735H01L33/502
Inventor 张琳李万元毛建权恒道
Owner BEIJING YUJI SCI & TECH
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