Processing method for improving luminous efficiency and moisture resistance of stannate red-light-emitting material

A technology of luminous efficiency and processing method, applied in the field of optimization of the properties of inorganic solid luminescent materials, can solve the problems of high air-sensitive metal nitrides, lack of synthesis requirements, low light color purity, etc., to reduce radiation-free cross-relaxation, The effect of improving moisture resistance and increasing luminous efficiency

Inactive Publication Date: 2020-10-16
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, red nitride phosphors have two major disadvantages: harsh synthesis requirements and lack of air sensitivity; metal nitrides require very high cost; too wide emission bands, resulting in low light color purity, are limited in indoor lighting
[0004] However, the luminous efficiency and thermal stability of Mn4+-doped stannate red phosphors need to be improved to meet their application in white LEDs.

Method used

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  • Processing method for improving luminous efficiency and moisture resistance of stannate red-light-emitting material
  • Processing method for improving luminous efficiency and moisture resistance of stannate red-light-emitting material
  • Processing method for improving luminous efficiency and moisture resistance of stannate red-light-emitting material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In 100 mL of water, add stannous oxide SnO to form a salt solution with a mass of 5%. Put the red light material NaRbSnF6:Mn4+ into the solution, accounting for 50% of the mass. In order to fully soak, use a stirring speed of 1500 rpm Stir separately, soak after 20 minutes, then suction filter, dry in the air, obtain the product after optimization. The product processed by this embodiment emits deep red fluorescence under near ultraviolet irradiation. Such as figure 1 As shown in the present embodiment, the emission peak table does not change, but the intensity is greatly enhanced; as attached figure 2 Shown XRD characterizes that the product that the technology of the present invention is processed is the NaRbSnF of pure phase; As attached image 3 As shown, the luminous intensity of the NaRbSnF6:Mn4+ product obtained in this embodiment is increased, and the moisture resistance is greatly enhanced. The XRD and fluorescence spectra of other examples are basically si...

Embodiment 2

[0024] In 100 mL of water, add stannous oxide SnO to form a salt solution with a mass of 1%. Put the red light material NaRbSnF6:Mn4+ into the solution, accounting for 30% by mass. For sufficient immersion, use a stirring speed of 2000 rpm Stir separately, soak for 10 minutes, then suction filter and dry to obtain the optimized product. The product treated with this embodiment emits deep red fluorescence under near-ultraviolet irradiation. Compared with the untreated sample, the luminous intensity and moisture resistance of the product of this embodiment are greatly enhanced.

Embodiment 3

[0026] In 100 mL of water, add stannous oxide SnO to form a salt solution with a mass of 10%. Put the red light material NaRbSnF6:Mn4+ into the solution, accounting for 70% of the mass. For sufficient soaking, use a stirring speed of 2000 rpm Stir in minutes, soak for 30 minutes, then suction filter and dry to obtain the optimized product. The product treated with this embodiment emits deep red fluorescence under near-ultraviolet irradiation. Compared with the untreated sample, the luminous intensity and moisture resistance of the product of this embodiment are greatly enhanced.

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Abstract

The invention discloses a processing method for improving luminous efficiency and moisture resistance of a stannate red-light-emitting material. According to the method, a same-element low-valence ionreduction method is adopted, a core-shell structure is formed, the luminous efficiency and the moisture resistance of the acid salt red-light-emitting material are effectively improved, the stannatered-light-emitting materials A2SnF6: Mn<4+> and BSnF6: Mn<4+> are soaked in a Sn metal or Sn<2+> salt solution, A is one or more than two of Li, Na, K, Rb and Cs, and B is one or more than two of Mg,Ca, Sr, Ba and Zn. The method has the advantages of no introduction of new impurities, cheap and accessible raw materials, simple and feasible technique, mild conditions and low cost, effectively enhances the properties of the red light material, and is beneficial to large-scale industrial production.

Description

technical field [0001] The invention relates to a method for optimizing the properties of an inorganic solid luminescent material, in particular to a processing method for improving the luminous efficiency and moisture resistance of a stannate red light material. Background technique [0002] White LEDs (WLEDs) have attracted widespread attention due to their low energy consumption and long lifetime compared with traditional lighting sources (fluorescent or incandescent). Most commercial white LEDs (WLEDs) are formed by phosphor conversion: a yellow phosphor is essential such as YAG:Ce, which converts the blue light emitted by the GaN chip into white light [Shang M, Li C, Lin J. How to Produce White Light in a Single‐Phase Host Chem. Soc. Rev. 2014, 45(18):1372-86.]. Therefore, there has been great interest in the synthesis of phosphors with PL spectra well matched to InGaN chips, especially with broad excitation bands in the blue region. But this kind of WELD has a low co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 潘跃晓李冬朱嘉文金奕恬陈欣娅林奕闻锦璇
Owner WENZHOU UNIVERSITY
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