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Preparation method of titanate fluorescent powder for LED

A technology of phosphor and titanate, applied in the field of preparation of titanate phosphor for LED, can solve the problem of poor color rendering performance of phosphor, uneven particle size of phosphor particle, and uneven mixing of activator in phosphor. and other problems, to achieve the effect of uniform particle size distribution, low equipment requirements, and excellent luminous performance

Active Publication Date: 2016-05-11
SHENZHEN JUFEI OPTOELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the uneven mixing of the activator in the obtained phosphor material due to the direct high-temperature calcination of the phosphor material obtained by the traditional solid-state method, the poor color rendering performance of the phosphor, and the particle size of the phosphor particle The technical bottleneck of uneven size, thus proposing a preparation method of titanate phosphor for LED

Method used

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  • Preparation method of titanate fluorescent powder for LED

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 This embodiment discloses a kind of M x Sr 1-x TiO 3 :yRE 3+ The preparation method of fluorescent powder (being titanate fluorescent powder), concrete steps are as follows:

[0029] (1) According to the molar ratio of Ca:Sr:Ti=0.2:0.8:1, weigh 0.395g of CaCO 3 Powder, 2.126g of Sr(OH) 2 ·8H 2 O and 4.021g of Ti(SO 4 ) 2 9H 2 O. According to Eu 3+ The molar concentration is 4mol% (referring to Eu 3+ Accounted for matrix material Ca 0.2 Sr0.8 TiO 3 molar concentration), weigh 0.070g of Eu 2 o 3 Powder.

[0030] (2) the CaCO in step 1) 3 , Sr(OH) 2 ·8H 2 O, Ti(SO 4 ) 2 9H 2 O and Eu 2 o 3 Put the powder together in 350mL of 10% HNO 3 In solution, incubate at 50°C for 90 minutes to obtain clear Ca 2+ 、Sr 2+ 、Ti 4+ and Eu 3+ mixture.

[0031] (3) According to C 6 h 8 o 7 (citric acid): the ratio of Ti=2.25:1, weigh 4.728g of C 6 h 8 o 7 ·H 2 O is placed in the solution of step 2), and then the solution is placed on a magnetic...

Embodiment 2

[0036] Embodiment 2 This embodiment discloses a kind of M x Sr 1-x TiO 3 :yRE 3+ The preparation method of fluorescent powder (being titanate fluorescent powder), concrete steps are as follows:

[0037] (1) According to the molar ratio of Mg:Ba:Sr:Ti=0.1:0.4:0.5:1, weigh 0.040g of MgO, 0.789g of BaCO 3 Powder, 1.329g of Sr(OH) 2 ·8H 2 O and 4.021g of Ti(SO 4 ) 2 9H 2 O. According to Sm 3+ The molar concentration is 0.5mol% (referring to Sm 3+ Accounting for matrix material Mg 0.1 Ba 0.4 Sr 0.5 TiO 3 molar concentration), weigh 0.009g of Sm 2 o 3 Powder.

[0038] (2) MgO, BaCO in step 1) 3 , Sr(OH) 2 ·8H 2 O, Ti(SO 4 ) 2 9H 2 O and Sm 2 o 3 Put the powder together in 120mL of 35% HNO 3 In solution, keep warm at 70°C for 45min to obtain clear Mg 2+ 、Ba 2+ 、Sr 2+ 、Ti 4+ and Sm 3+ mixture.

[0039] (3) According to C 6 h 8 o 7 (citric acid): the ratio of Ti=3.2:1, weigh 6.724g of C 6 h 8 o 7 ·H 2 O is placed in the solution of step 2), and th...

Embodiment 3

[0043] Embodiment 3 This embodiment discloses a kind of M x Sr 1-x TiO 3 :yRE 3+ The preparation method of fluorescent powder (being titanate fluorescent powder), concrete steps are as follows:

[0044] (1) According to the molar ratio of Ba:Sr:Ti=0.5:0.5:1, weigh 0.987g of BaCO 3 Powder, 1.329g of Sr(OH) 2 ·8H 2 O and 4.021g of Ti(SO 4 ) 2 9H 2 O. According to Tm 3+ The molar concentration is 7mol% (referring to Tm 3+ Accounted for matrix material Ba 0.5 Sr 0.5 TiO 3 molar concentration), weigh 0.135g of Tm 2 o 3 Powder.

[0045] (2) BaCO in step 1) 3 , Sr(OH) 2 ·8H 2 O, Ti(SO 4 ) 2 9H 2 O and Tm 2 o 3 Put the powder together in 600mL of 5% HNO 3 solution, at 55 ° C for 60 min, to obtain a clear Ba 2+ 、Sr 2+ 、Ti 4+ and Tm 3+ mixture.

[0046] (3) According to C 6 h 8 o 7 (citric acid): the ratio of Ti=1.2:1, weigh 2.522g of C 6 h 8 o 7 ·H 2 O is placed in the solution of step 2), and then the solution is placed on a magnetic stirrer, and t...

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Abstract

The invention belongs to the technical field of fluorescent powder preparation achieved through a wet chemistry method, and particularly relates to a preparation method of titanate fluorescent powder for an LED. The titanate fluorescent powder is prepared by adopting a sol-gel method and can be obtained in later low temperature calcination. Compared with a traditional high temperature solid state method, the sol-gel method has the advantages that the needed later calcination temperature is low, the requirement on equipment is low, energy consumption is little, and the method is suitable for industrialized production; RE<3+> in the fluorescent powder obtained through the sol-gel method is uniformly dispersed and can easily enter M(x)Sr(1-x)TiO3 to achieve energy transmission, and the obtained fluorescent powder is excellent in luminescence property. The fluorescent powder obtained through the sol-gel method is uniform in particle size distribution and is uniformly mixed with sealing glue. The obtained titanate fluorescent powder are uniform in particle size distribution and good in color rendering property, can be widely applied to the fields of illumination, backlight and the like and has the great market prospect and economic value.

Description

technical field [0001] The invention belongs to the technical field of phosphor powder preparation by wet chemical method, and in particular relates to a preparation method of titanate phosphor powder for LED. Background technique [0002] At present, rare earth luminescent materials have become the core materials in the fields of information display, lighting source, and optoelectronic devices. Among them, the most widely used is the phosphor material that can be excited by ultraviolet light-blue light (200-500nm) to produce different luminous colors. The high color purity, high luminous intensity and evenly distributed particle size of phosphor powder can significantly improve the performance of LED devices. At present, phosphor matrix materials mainly include aluminate, silicate, tungstate, nitride, fluoride, and titanate, etc., but the luminescent properties of phosphors in different systems are different. [0003] In 2006, Hong Zhanglian et al. used alkaline earth car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67
CPCC09K11/77C09K11/7728C09K11/7759
Inventor 高丹鹏甘树威邢其彬
Owner SHENZHEN JUFEI OPTOELECTRONICS
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