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Near ultraviolet excited red fluorescent powder and preparation method thereof

A technology of red phosphor and near-ultraviolet light, which is applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of phosphor not being environmentally friendly and red light impurity, and reduce dipole-dipole interaction , avoid concentration quenching, and increase yield

Pending Publication Date: 2021-04-13
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because Eu 3+ Mainly exhibits a strong red emission band, commercially available sulfides such as Y 2 o 2 S:Eu 3+ Red phosphors have been widely used in white LEDs, but the phosphors prepared from this sulfide are not environmentally friendly, and the red light is often impure

Method used

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  • Near ultraviolet excited red fluorescent powder and preparation method thereof
  • Near ultraviolet excited red fluorescent powder and preparation method thereof
  • Near ultraviolet excited red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: La 2 SeO 6 :0.2Eu 3+

[0017] Weigh La with a purity greater than 99.9% according to the stoichiometric ratio 2 o 3 , SeO 2 and Eu 2 o 3 The raw materials, will be weighed raw materials mixed thoroughly. Then the mixed powder was placed in a crucible and pre-fired at 200°C for 3 hours. After pre-calcination, the calcined powder was ground again and calcined in air at 1000°C for 18h. After naturally cooling to room temperature, the obtained powder was ground again to obtain the phosphor powder.

Embodiment 2

[0018] Example 2: La 2 SeO 6 :0.1Eu 3+

[0019] Weigh La with a purity greater than 99.9% according to the stoichiometric ratio 2 o 3 , SeO 2 and Eu 2 o 3 The raw materials, will be weighed raw materials mixed thoroughly. Then the mixed powder was placed in a crucible and pre-fired at 500°C for 1 hour. After pre-calcination, the calcined powder was ground again and calcined in air at 1200°C for 6h. After naturally cooling to room temperature, the obtained powder was ground again to obtain the phosphor powder.

Embodiment 3

[0020] Example 3: La 2 SeO 6 :0.15Eu 3+

[0021] Weigh La with a purity greater than 99.9% according to the stoichiometric ratio 2 o 3 , SeO 2 and Eu 2 o 3 The raw materials, will be weighed raw materials mixed thoroughly. The mixed powder was then placed in a crucible and pre-fired at 400°C for 2 hours. After pre-calcination, the calcined powder was ground again and calcined in air at 1100°C for 13h. After naturally cooling to room temperature, the obtained powder was ground again to obtain the phosphor powder.

[0022] Depend on figure 1 The XRD collection of patterns shows, taking embodiment 1,2 as example, by and La 2 SeO 6 The comparison of the standard diffraction peaks can be seen that the method provided by the invention successfully synthesizes and pure La 2 SeO 6 :Eu 3+ Phosphor. according to figure 2 , 3 The excitation and emission spectra of the phosphor powders show that the phosphor powders prepared in Example 1 and Example 2 emit strong red l...

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Abstract

The invention discloses near ultraviolet excited red fluorescent powder and a preparation method thereof, and belongs to the field of luminescent materials. The chemical formula of the fluorescent powder is La2SeO6: xEu<3+>, wherein x is larger than 0 and smaller than or equal to 0.2; the fluorescent powder is successfully prepared through a high-temperature solid-phase reaction method; in the doping concentration range, dipole and dipole interaction between Eu<3+> ions is reduced, so that concentration quenching is avoided; and the red fluorescent powder can emit red light at 616 nm under excitation of near ultraviolet light of 393 nm. The preparation method provided by the invention is simple in process, stable in product performance and suitable for industrial production.

Description

technical field [0001] The invention provides a near-ultraviolet-excited red fluorescent powder and a preparation method thereof, belonging to the technical field of preparation and application of luminescent materials. Background technique [0002] Phosphors are widely used in TV screens, fluorescent lights, mobile phones, oscilloscopes and white light-emitting diodes (LEDs). The most important and promising application of phosphor powder is that white LED has gradually replaced traditional incandescent and fluorescent lamps due to its energy saving, good reliability, long life, and environmental friendliness. However, commercial white LEDs have problems such as poor color rendering index and high correlated color temperature due to the lack of proper red components. Therefore, in order to overcome the above-mentioned problems, a solution combining near-ultraviolet chips with three-color (red, blue, green) phosphors is proposed. Therefore, it is necessary to find red phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88H01L33/50
CPCC09K11/886H01L33/502
Inventor 张乐甄方正康健张永丽罗泽赵超
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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