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Fluorescent powder with adjustable light-emitting color and preparation method thereof

A technology of luminescent color and phosphor, applied in luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve problems such as poor light quality, high color temperature, and limited application range

Active Publication Date: 2020-09-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial WLEDs mainly excite YAG:Ce through blue chips. 3+ Due to the lack of red light components in the yellow phosphor spectrum, the color rendering index (CRI) is low (CRI4500), and the light quality is poor, which limits its Application range

Method used

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  • Fluorescent powder with adjustable light-emitting color and preparation method thereof
  • Fluorescent powder with adjustable light-emitting color and preparation method thereof
  • Fluorescent powder with adjustable light-emitting color and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Preparation of Ba 3 CeK(PO 4 ) 3 f

[0019] According to the chemical formula Ba 3 CeK(PO 4 ) 3 The stoichiometric ratio of each element in F, respectively weigh BaCO 3 (0.5512 grams), K 2 CO 3 (0.0772 g), BaF 2 (0.0980 g), NH 4 h 2 PO 4 (0.3855 g), CeO 2 (0.1923 grams). Grind thoroughly in an agate mortar and mix evenly, transfer to a corundum crucible, place the resulting mixture in a muffle furnace, 2 +N 2 Burn at 1100°C for 3 hours in a reducing atmosphere to obtain the required phosphor.

[0020] The emission spectrum of the phosphor is shown in figure 2 As shown in (a), when the excitation wavelength is 323nm, it can be seen from the figure that its emission spectrum is a broadband asymmetric emission, and the highest peak is around 428nm, which belongs to Ce 3+ The light emitted by the phosphor powder is blue light, and the color coordinates are (0.178,0.120).

Embodiment 2

[0022] Preparation of Ba 3 Ce 0.95 K(PO 4 ) 3 F:0.05Tb 3+

[0023] According to the chemical formula Ba 3 Ce 0.95 K(PO 4 ) 3 F:0.05Tb 3+ The stoichiometric ratio of each element in , respectively weighed BaCO 3 (0.5512 grams), K 2 CO 3 (0.0772 g), BaF 2 (0.0980 g), NH 4 h 2 PO 4 (0.3855 g), CeO 2 (0.1827 g), Tb 4 o 7 (0.0104 grams). Grind thoroughly in an agate mortar and mix evenly, transfer to a corundum crucible, place the resulting mixture in a muffle furnace, 2 +N 2 Burn at 1100°C for 3 hours in a reducing atmosphere to obtain the required phosphor.

[0024] The emission spectrum of the phosphor is shown in figure 2 As shown in (b), when the excitation wavelength is 323nm, the emission spectrum except Ce 3+ The emission band also appeared Tb 3+ The emission band, where Ce 3+ The highest emission peak at 428nm, Tb 3+ The highest emission peak of the phosphor is around 548nm, and the emission color of the phosphor is blue-green light, and the colo...

Embodiment 3

[0026] Preparation of Ba 3 Ce 0.90 K(PO 4 ) 3 F: 0.10Tb 3+

[0027] According to the chemical formula Ba 3 Ce 0.90 K(PO 4 ) 3 F: 0.10Tb 3+ The stoichiometric ratio of each element in , respectively weighed BaCO 3 (0.5512 grams), K 2 CO 3 (0.0772 g), BaF 2 (0.0980 g), NH 4 h 2 PO 4 (0.3855 g), CeO 2 (0.1731 g), Tb 4 o 7 (0.0209 grams). Grind thoroughly in an agate mortar and mix evenly, transfer to a corundum crucible, place the resulting mixture in a muffle furnace, 2 +N 2 Burn at 1100°C for 3 hours in a reducing atmosphere to obtain the required phosphor.

[0028] The emission spectrum of the phosphor is shown in figure 2 As shown in (c), when the excitation wavelength is 323nm, the emission spectrum except Ce 3+ The emission band also appeared Tb 3+ The emission band, where Ce 3+ The highest emission peak at 428nm, Tb 3+ The highest emission peak is around 548nm, and the luminescent color of the phosphor is green-blue light, and the color coordinat...

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Abstract

The invention relates to the field of design and synthesis of novel fluorescent powder and regulation and control of light-emitting colors, in particular to novel fluorescent powder with adjustable light-emitting colors and a preparation method of the novel fluorescent powder. The chemical formula of the fluorescent powder is Ba<3>Ce<1-x>K (PO<4>)<3>F:xTb<3+>, wherein x is the molar weight of Ce <3 + > ions substituted by Tb < 3 + > ions, x is more than or equal to 0.00 and less than or equal to 0.50, and the ratio of Ce < 3 + > to Tb < 3 + > in the fluorescent powder is changed by adjustingthe substitution amount under the condition that the sintering temperature and other environments are the same, so that the aim of adjusting and controlling the light emitting color of the fluorescentpowder from blue to green is fulfilled. The fluorescent powder is simple to prepare, and the luminous color of the fluorescent powder can be regulated and controlled by changing the concentration ofdoped ions.

Description

technical field [0001] The present invention relates to the field of design and synthesis of novel fluorescent powder and regulation of luminous color, in particular to a phosphor capable of luminous color regulation through ion substitution and a preparation method thereof, which belongs to the field of solid-state luminescent technology and has great application prospects in the field of lighting. Background technique [0002] White light-emitting diodes (WLEDs) have the advantages of high luminous efficiency, long life, small size, pure solid, energy saving and environmental protection, and are regarded as a new generation of lighting sources. At present, commercial WLEDs mainly excite YAG:Ce through blue chips. 3+ Due to the lack of red light components in the yellow phosphor spectrum, the color rendering index (CRI) is low (CRI<80), the color temperature (CCT) is high (CCT>4500), and the light quality is poor, which limits its application range. Ultraviolet ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
CPCC09K11/7779Y02B20/00
Inventor 吴占超焦妍梅张雪刘杰
Owner QINGDAO UNIV OF SCI & TECH