Red-light fluorescent powder with narrow band and preparation method of red-light fluorescent powder

A red light phosphor, narrow-spectrum technology, applied in the field of phosphor materials, can solve the problems of combined fluorosis death, operator impact, strong corrosion, etc., to achieve the effect of improving color rendering index, production safety, and avoiding hazards

Active Publication Date: 2016-04-20
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrofluoric acid is a colorless and transparent liquid. Industrial use will cause certain harm to the environment. At the same time, due to strong penetration and corrosion, it is easy to cause skin nec

Method used

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  • Red-light fluorescent powder with narrow band and preparation method of red-light fluorescent powder
  • Red-light fluorescent powder with narrow band and preparation method of red-light fluorescent powder
  • Red-light fluorescent powder with narrow band and preparation method of red-light fluorescent powder

Examples

Experimental program
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Example Embodiment

[0023] Example 1: K 2 Si 0.9 Mn 0.1 F 6 Preparation of phosphor.

[0024] According to formula K 2 Si 0.9 Mn 0.1 F 6 The stoichiometric ratios of the elements in each element, weigh 2 moles of KF and 0.9 moles of SiO 2 , 0.1 mole of MnO 2 , 4 moles of NH 4 F, and add 3%wt AlF 3 As an auxiliary, place all the weighed raw materials in a corundum mortar and mix them evenly. The mixing time is generally not less than 0.5h. The entire mixing process needs to be carried out in a fume hood. Put the mixed raw materials into a molybdenum crucible for compaction, and put the crucible into a sintering furnace. Pass F into the sintering furnace 2 And N 2 The mixed gas as a protective atmosphere, where F 2 And N 2 The volume ratio is 10:90; the temperature rise rate is 10℃ / min to 760℃, and the sintering is carried out at 760℃. The holding time (ie sintering time) is 8h. After that, the temperature is lowered to 100°C at a cooling rate of 5°C / min, and then naturally lowered to room temperature...

Example Embodiment

[0029] Example 14: K 2 Ge 0.9 Mn 0.1 F 6 Preparation of phosphor.

[0030] According to formula K 2 Ge 0.9 Mn 0.1 F 6 The stoichiometric ratio of each element in the KF, GeO 2 , MnO 2 , NH 4 F, and add 3%wt AlF 3 As an additive. Put all the weighed raw materials in a corundum mortar and mix them evenly. The mixing time is generally not less than 0.5h. The whole mixing process needs to be carried out in a fume hood. Put the mixed raw materials into a molybdenum crucible for compaction, and put the crucible into a sintering furnace. Pass F into the sintering furnace 2 And N 2 The mixed gas as a protective atmosphere, where F 2 And N 2 The volume ratio is 15:85, and the temperature is increased to 760℃ at a heating rate of 8℃ / min; sintering is carried out at 760℃, and the holding time is 52h. After the sintering is completed, the temperature is reduced to 100°C at a cooling rate of 7°C / min, and then the temperature is naturally cooled to room temperature before being taken out to o...

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Abstract

The invention provides red-light fluorescent powder with a narrow band and a preparation method of the red-light fluorescent powder. The general chemical formula of the red-light fluorescent powder with the narrow band is AnB(1-x)MnxF6, wherein A is at least one of Na, K, Ba and Zn, B is at least one of Ti, Si, Ge and Gd, n is larger than or equal to 1 and smaller than or equal to 2, and x is larger than 0 and smaller than or equal to 2. The inner quantum efficiency of the AnB(1-x)MnxF6 fluorescent powder can reach 90%, and the red-light fluorescent powder with the narrow band has extremely narrow half-peak breadth and has very large development space in the backlight field. According to the preparation method of the red-light fluorescent powder with the narrow band, a high-temperature solid-state method is adopted for preparation, hydrofluoric acid with high concentration is effectively avoided, harm to a human body and the environment is avoided, and meanwhile, the high-temperature solid-state method for preparation is more suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a phosphor material, in particular to a narrow-band red phosphor and a preparation method thereof. Background technique [0002] In 1996, white LEDs combined with blue LEDs and YAG phosphors appeared, known as the fourth-generation lighting sources that will surpass incandescent lamps, fluorescent lamps and xenon lamps (HID lamps). White LEDs have the advantages of small size, long life, less energy consumption, less pollution, no need for inverters, high luminance, and no mercury. Therefore, white LEDs have profound energy-saving potential and a huge lighting application market. In 1997, Nichia first reported Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow fluorescent material and blue InGaN chip combination, the principle is to use blue light-emitting diodes to excite yttrium aluminum garnet (referred to as YAG) phosphors to generate yellow light with a wavelength of 555nm complementary to blue light, and then use the lens principl...

Claims

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Application Information

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IPC IPC(8): C09K11/61C09K11/66C09K11/67C09K11/85
CPCC09K11/616C09K11/665C09K11/675C09K11/7705
Inventor 杨志平李璇璇路亚娟赵金鑫
Owner HEBEI LIFU CHEM TECH
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