Preparation method of red fluorescent powder

A technology of red fluorescent powder and fluorescent powder, which is applied in the field of fluorescent powder, can solve the problems of high price of white LED, low LED luminous flux, low color rendering index, etc., and achieve the effect of large contact surface area, simple synthesis conditions and stable product performance

Pending Publication Date: 2020-07-14
TANGSHAN COLLEGE
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  • Claims
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Problems solved by technology

[0003] At present, white light can be obtained through three schemes: one is a white light device composed of red, green and blue light-emitting diodes; a white LED device is composed of blue light-emitting InGaN chips and Y 3 A 1 : Ce 3+ It is composed of yellow phosphor, but it still has some weaknesses, that is, high correlated color temperature, low color rendering index, and color deviation, all of which are caused by the lack of red light components (>600nm) and the reabsorption of light by blue InGaN chips resulting; the last t

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  • Preparation method of red fluorescent powder
  • Preparation method of red fluorescent powder
  • Preparation method of red fluorescent powder

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[0036] Example 1:

[0037] The preparation method of a red phosphor provided by the present invention comprises the following steps:

[0038] First, the BaCO was accurately weighed according to the stoichiometric ratio using an analytical balance (FA22048). 3 , BaF 2 , H 3 BO 3 and Eu 2 O 3 , of which the purity of rare earth oxides is 99.99%, and the rest are analytically pure;

[0039] (4-0.14)BaCO 3 +BaF 2 +4H 3 BO 3 +0.14 / 2Eu 2 O 3 →Ba 5-x B 4 O 10 F 2 :0.14Eu 3+

[0040] Then, the weighed above-mentioned sample was placed in an agate mortar, mixed and ground, placed in a crucible after grinding for 30 minutes, and placed in a high-temperature box-type resistance furnace (SRJX-4-13) at 400 °C for 2 hours for initial calcination. Boric acid slowly decomposes to form B 2 O 3 , the sintered block A was obtained.

[0041] It should be noted that the decomposition of boric acid provides boron source for subsequent products, and the decomposition of boric ac...

Example Embodiment

[0048] Example 2:

[0049] First, the BaCO was accurately weighed according to the stoichiometric ratio using an analytical balance (FA22048). 3 , BaF 2 , H 3 BO 3 and Eu 2 O 3 , of which the purity of rare earth oxides is 99.99%, and the rest are analytically pure;

[0050] (4-0.11)BaCO 3 +BaF 2 +4H 3 BO 3 +0.11 / 2Eu 2 O 3 →Ba 5-x B 4 O 10 F 2 :0.11Eu 3+

[0051] Then, the weighed above-mentioned sample was placed in an agate mortar, mixed and ground for 40 minutes, and then placed in a crucible, and then placed in a high-temperature box-type resistance furnace (SRJX-4-13) at 450 °C for 3 hours for initial calcination, so that the Boric acid slowly decomposes to form B 2 O 3 , the sintered block A was obtained.

[0052] Then, the sintered block A obtained by the above operation was taken out and ground, raised to 650°C at a heating rate of 20°C / min and kept at this temperature for 7 hours to make BaCO 3 Slowly decompose to form BaO, and obtain sintered blo...

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Abstract

The invention discloses a preparation method of red fluorescent powder, which comprises the following steps: (1) weighing one part of BaCO3, one part of BaF2, one part of Eu2O3 and four parts of B2O3,pouring the components into a container, and mixing and grinding for 0.5-1.5 hours to obtain mixed powder A; (2) heating the mixed powder A to 600-650 DEG C at a heating rate of 15-25 DEG C/min, keeping the temperature constant, calcining for 6-10 hours to decompose and thermally decompose BaCO3 to generate BaO, heating the mixed powder A to react to form a sintered block B, and grinding to obtain mixed powder B; (3) taking out the mixed powder B after the mixed powder B is cooled; heating to 770-785 DEG C at a heating rate of 15-25 DEG C/min, and calcining for 8-10 hours at the temperature of 770-785 DEG C; taking out and grinding for 6 to 7 times in the period; wherein grinding is conducted for 1-1.5 h each time; wherein the grinding time for each time of taking out is 30-60 minutes; finally, cooling with the furnace to obtain Ba5B4O10F2:xEu<3+> fluorescent powder. The present invention adopts a high temperature solid phase reaction method to prepare Ba5B4O10F2:xEu<3+> (x=0.01, 0.02...0.2) fluorescent powder with different doping concentrations.

Description

technical field [0001] The invention relates to the field of fluorescent powder, in particular to a preparation method of red fluorescent powder. Background technique [0002] With the continuous advancement of science and technology in today's society, people begin to pursue a higher quality of life after gradually satisfying their basic living needs. Environmental protection terms such as "energy saving", "low carbon" and "green" have begun to further enter people's lives, and people's demand for high-tech products is also increasing. Therefore, it is particularly important to explore new, clean, energy-saving and environmentally friendly materials. . As a new type of solid-state light source, light-emitting diode (LED) has many advantages such as energy saving, green environmental protection, high efficiency, long life (more than 10000h), small size, and easy maintenance. The fourth-generation lighting source of the lamp has great application prospects in the field of l...

Claims

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Application Information

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IPC IPC(8): C09K11/63
CPCC09K11/774
Inventor 赵文武刘剑郁建元王秀文郝斌黄燕
Owner TANGSHAN COLLEGE
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