Preparation method of red fluorescent powder

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...

AI Technical Summary

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 type of white light device is a combination of near ultraviolet (NUV) light-emitting diodes with three-color (red, green, blue) light-emitting phosphors or red and green phosphors with blue LED chips

[0004] However, commercially available conventional Y 2 o 3 :Eu 3+ and Y 2 o 2 S:Eu 3+ The luminous intensity of red phosphor is lower than that of blue or green phosphor, so that the current white LED still faces problems such as high overall price, low luminous efficiency, low color rendering index, and low luminous flux of a single LED.

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