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Red phosphor, its preparation method and light-emitting device comprising the red phosphor

A technology of red fluorescent powder and light-emitting devices, which is applied in the direction of light-emitting materials, semiconductor devices, chemical instruments and methods, etc., can solve the problems of low quantum efficiency, irregular particle shape, poor light and color performance, etc., and achieve high luminous efficiency, Uniform shape and good stability

Active Publication Date: 2020-05-12
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported fluoride phosphors have irregular particle morphology, low quantum efficiency, and poor photochromic properties, which cannot well meet the requirements of high luminous efficacy, uniform morphology, and appropriate particle size for practical white LED phosphors.

Method used

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  • Red phosphor, its preparation method and light-emitting device comprising the red phosphor
  • Red phosphor, its preparation method and light-emitting device comprising the red phosphor
  • Red phosphor, its preparation method and light-emitting device comprising the red phosphor

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preparation example Construction

[0033] At the same time, the present invention also provides a method for preparing red fluorescent powder. The preparation method includes: respectively weighing the compounds of element A, element D, element X and manganese according to the stoichiometric ratio; dissolving the compounds containing each element in In a 20-60% HF solution, a solution containing each element is obtained; the solution containing each element is mixed and dropped and stirred to obtain a mixed solution, and the mixed solution is left standing, filtered and dried in sequence to obtain a fluoride red phosphor . Preferably, the filtration is vacuum filtration, and the drying method is drying. After drying, a step of sieving is preferably included to properly screen the particle size.

[0034] An exemplary embodiment of the preparation method of the red phosphor provided by the present invention will be described in more detail below. These example embodiments may, however, be embodied in many diffe...

Embodiment 1

[0052] According to K 2 (Ge 0.7 Si 0.1 )F 6 :0.2Mn 4+ The stoichiometric ratio was weighed K 2 MnF 6 、K 2 SiF 6 、K 2 GeF 6 and other raw materials were dissolved in 25wt% HF solution respectively to obtain K 2 MnF 6 and K 2 SiF 6 、K 2 GeF 6 The two mixed solutions are uniformly added dropwise according to the proportion, the mixed solution is added dropwise, stirred, left standing, and vacuum filtered to obtain a golden yellow precipitate, which is the fluoride red phosphor.

[0053] The XRD spectrum of the fluoride red fluorescent powder prepared by this embodiment is as follows figure 1 shown, from figure 1 It can be seen that the diffraction spectrum is consistent with the ICSD diffraction card (30310) control peak (the third row from bottom to top), there is no impurity, and the peak shape is sharp, and the purity of the synthetic product is high.

[0054] The SEM spectrum of the fluoride red fluorescent powder prepared by this embodiment is as follows F...

Embodiment 2

[0057] According to (Na 0.1 K 1.9 )(Ge 0.7 Si 0.1 )F 6 :0.2Mn 4+ The stoichiometric ratio was weighed K 2 MnF 6 、K 2 SiF 6 、K 2 GeF 6 , NaF and other raw materials were dissolved in 20wt% HF solution to obtain K 2 MnF 6 and K 2 SiF 6 、K 2 GeF 6 、Na 2 CO 3 The two mixed solutions are uniformly added dropwise according to the proportion, the mixed solution is added dropwise, stirred, left standing, and vacuum filtered to obtain a golden yellow precipitate, which is the fluoride red phosphor.

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Abstract

The invention provides a red fluorescent powder, a preparation method thereof and a light-emitting device containing the red fluorescent powder. The red fluorescent powder includes an inorganic compound, and the inorganic compound includes A element, D element, X element and manganese element, wherein A is one or more elements of Li, Na and K, and must contain K element; D is Ge and Si two elements, or D is Si, Ge and Ti three elements; X is one or more elements in F, Br and Cl, and must contain F element; and the inorganic compound has the same composition as K 2 GeF 6 The same space group structure, the space group structure is P‑6 of the hexagonal crystal system 3 mc(186). The red fluorescent powder has uniform appearance, high luminous efficiency and good stability, and is suitable for being combined with a blue LED chip to form a backlight source for liquid crystal display LEDs.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a red fluorescent powder, a preparation method thereof and a light-emitting device containing the red fluorescent powder. Background technique [0002] In 1993, Nichia invented gallium nitride (GaN)-based blue light-emitting diodes (light-emitting diodes), which broke through the technical bottleneck of blue light LEDs; in 1996, the successful development of high-brightness blue light LEDs made it possible to rely on blue light LEDs. It is possible for the chip to excite phosphors such as yellow, green and red to compound into white LEDs. White light LED (also known as semiconductor lighting source), because of its advantages of high brightness, long life, and no pollution, is considered to be a new generation of green lighting source, and its development speed is rapid. [0003] At present, the application field of white light LED is mainly concentrated in the field of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66H01L33/50
CPCC09K11/665H01L33/504C09K11/77348H01L33/502C09K11/0883C09K11/666C09K11/676
Inventor 刘荣辉陈观通金玉明马小乐刘元红邵冷冷
Owner GRIREM ADVANCED MATERIALS CO LTD
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