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Ceramic fluorescent sheet for LED and pressureless sintering method of ceramic fluorescent sheet

A technology of ceramic fluorescent sheet and sintering method, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of unstable and low relative density, and achieve the requirements of not strict experimental schedule, simple experimental process, and high thermal conductivity Effect

Inactive Publication Date: 2021-03-09
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its relative density is unstable and generally not high, and the factors affecting relative density are various, batch stability is still a challenge for industrial production

Method used

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  • Ceramic fluorescent sheet for LED and pressureless sintering method of ceramic fluorescent sheet
  • Ceramic fluorescent sheet for LED and pressureless sintering method of ceramic fluorescent sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Sr 1.97 Si 5 N 8 :0.03Eu 2+

[0015] First, prepare the phosphor, and weigh Sr with a purity greater than 99.9% according to the stoichiometric ratio 3 N 2 、Eu 2 o 3 and Si 3 N 4 as raw material. The raw materials were ground and mixed with an agate mortar in an argon-filled glove box, ball milled on a planetary ball mill for 10 h, and then sealed with argon. Put the ball-milled powder in a tube furnace, pass through a hydrogen atmosphere in nitrogen with a hydrogen gas fraction of 10%, and calcinate at 1200° C. for 8 hours to obtain the phosphor. Then, sinter the ceramic phosphor, mix the synthesized phosphor with MgO and CaO with a purity greater than 99.9%, and the mass ratio of MgO to CaO is 0.5. The mass of MgO and CaO is 7% of the phosphor. The mixture was milled on a planetary ball mill using alumina balls for 5 hours, and then passed through a 200-mesh sieve. Use a uniaxial press to perform cold isostatic pressing at 300 MPa and hold the ...

Embodiment 2

[0016] Example 2: Ba 1.97 Si 5 N 8 :0.03Eu 2+

[0017] First, prepare the phosphor, and weigh Ba with a purity greater than 99.9% according to the stoichiometric ratio 3 N 2 、Eu 2 o 3 and Si 3 N 4 as raw material. The raw materials were ground and mixed with an agate mortar in an argon-filled glove box, ball milled on a planetary ball mill for 16 h, and then sealed with argon. Put the ball-milled powder in a tube furnace, pass through a hydrogen atmosphere in nitrogen with a hydrogen gas fraction of 5%, and calcinate at 1400° C. for 6 hours to obtain the phosphor. Then, sinter the ceramic phosphor, mix the synthesized phosphor with MgO and CaO with a purity greater than 99.9%, and the mass ratio of MgO and CaO is 2. The mass of MgO and CaO is 1% of the phosphor. The mixture was milled on a planetary ball mill using alumina balls for 7 hours, and then passed through a 200-mesh sieve. Use a uniaxial press, perform cold isostatic pressing at 150MPa, and hold the pres...

Embodiment 3

[0018] Embodiment 3: (Ba 0.8 ,Sr 0.2 ) 1.97 Si 5 N 8 :0.03Eu 2+

[0019] First, prepare the phosphor, and weigh Ba with a purity greater than 99.9% according to the stoichiometric ratio 3 N 2 、Sr 3 N 2 、Eu 2 o 3 and Si 3 N 4 as raw material. The raw materials were ground and mixed with an agate mortar in an argon-filled glove box, ball milled on a planetary ball mill for 10 h, and then sealed with argon. Put the ball-milled powder in a tube furnace, pass through a hydrogen atmosphere in nitrogen with a hydrogen gas fraction of 10%, and calcinate at 1200° C. for 8 hours to obtain the phosphor. Then, sinter the ceramic phosphor, mix the synthesized phosphor with MgO and CaO with a purity greater than 99.9%, and the mass ratio of MgO to CaO is 0.5. The mass of MgO and CaO is 7% of the phosphor. The mixture was milled on a planetary ball mill using alumina balls for 5 hours, and then passed through a 200-mesh sieve. Use a uniaxial press to perform cold isostatic p...

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Abstract

The invention discloses a ceramic fluorescent sheet for an LED and a pressureless sintering method of the ceramic fluorescent sheet and belongs to the technical field of preparation and application ofceramic fluorescent sheet materials. The chemical formula of the ceramic fluorescent sheet provided by the invention provides is (Ba1-x,Srx)1.97Si5N8:0.03Eu<2+>, wherein x is greater than or equal to0.2 and less than or equal to 1. Magnesium oxide and calcium oxide are added as sintering aids, the compact fluorescent transparent ceramic is obtained by pressureless sintering at the sintering temperature of 1650-1700 DEG C, and the relative density of the compact fluorescent transparent ceramic reaches 99-99.5%. The preparation method provided by the invention is simple in process, stable in product performance and suitable for industrial production.

Description

technical field [0001] The invention provides a ceramic fluorescent sheet for LED and a pressureless sintering method thereof, belonging to the technical field of preparation and application of ceramic fluorescent sheet materials. Background technique [0002] Some studies have reported packaging material technologies that do not use silicone-based phosphors in glass and ceramic phosphors (PC) and other plate-like phosphors mounted on blue LED chips to overcome the problems associated with silicones. Phosphor in glass (PiG) is a mixture of phosphor sintered in transparent glass, and its manufacturing process is simple because it requires a small amount of phosphor and glass frit powder and can be sintered at low temperatures below -800°C. However, in the use of automotive LED headlights, as the output power increases, excellent thermal conductivity is required to maintain high reliability and durability. Heat dissipation is reduced due to the low thermal conductivity of gla...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/64C09K11/77
CPCC04B35/584C04B35/622C04B35/64C09K11/7728C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/6567C04B2235/9646
Inventor 张乐甄方正邵岑申冰磊罗泽张永丽陈东顺
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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