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Lithium sodium fluosilicate red-light material for white-light LED (Light-Emitting Diode) and preparation method thereof

A lithium fluorosilicate and red light technology, applied in the field of luminescent materials, can solve the problem that the intensity of zero-photon rays needs to be further improved, and achieve the effects of reduced lattice symmetry, low cost, and increased intensity of zero-photon rays

Inactive Publication Date: 2018-02-13
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material can be applied to white light LEDs to improve its color rendering index; the product particles are uniform and fine, do not contain rare earths, the preparation method is simple, and are suitable for industrial production; however, the color coordinates of the material products obtained by this technology are located at: x=0.68, y=0.32 , although it is close to the international ideal red light standard (0.67, 0.33), there is still a certain gap. At the same time, the zero-photon ray intensity of the material obtained by this technology needs to be further improved

Method used

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  • Lithium sodium fluosilicate red-light material for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Lithium sodium fluosilicate red-light material for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Lithium sodium fluosilicate red-light material for white-light LED (Light-Emitting Diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Accurately weigh 0.6 mol of solid lithium nitrate, 0.6 mol of solid sodium fluoride, 0.54 mol of solid silicon dioxide, and potassium fluoromanganate solid equivalent to 2 mol% of silicon dioxide according to the stoichiometric ratio, and put all the solids into a concentration of 50 ml % HF aqueous solution, stirred at room temperature for 5 hours, filtered with suction, and dried naturally.

[0034] After testing, the product obtained in this embodiment is light yellow crystalline powder under natural light, and bright red light is found under ultraviolet light. Its XRD (Bruker D8Advance X-ray diffractometer detection) such as figure 1 As shown, XRD shows that the product is pure Li 0.5 Na 1.5 SiF 6 phase, an exact match to standard card 48‐0721. SEM is measured on Nova NanoSEM 200, under the action of electron beam, such as figure 2 As shown, magnified by 20,000 times, the microscopic appearance of the product is observed to be fine particles, with a diameter o...

Embodiment 2

[0040] Accurately weigh 0.6 mol of solid lithium nitrate, 0.6 mol of sodium fluoride, 0.54 mol of silicon dioxide, and potassium fluoromanganate equivalent to 0.25 mol% of silicon dioxide according to the stoichiometric ratio, and put all the solids into 50 ml of concentration of 20 wt .% HF aqueous solution, stirred at room temperature for 5 hours, filtered with suction, and dried naturally. The product glows red under a UV light. This product is a light yellow powder material, and its XRD pattern, scanning electron microscope, excitation spectrum and emission spectrum shape are basically the same as those of Example 1, while the intensity of excitation spectrum and emission spectrum is different. Fluoromax‐4 fluorescence spectrometer (HORIBA Jobin Yvon Inc .) Detection, the emission spectrum of the product of this embodiment is as Figure 4 As shown, the spectral shape and position are the same as in Example 1, but the intensity is weaker than that of Example 1 because the ...

Embodiment 3

[0042]Accurately weigh 0.6 mol of solid lithium nitrate, 0.6 mol of sodium fluoride, 0.54 mol of silicon dioxide, and potassium fluoromanganate equivalent to 0.5 mol% of silicon dioxide according to the stoichiometric ratio, and put all the solids into 50 ml of concentration of 20wt .% HF aqueous solution, stirred at room temperature for 5 hours, filtered with suction, and dried naturally. The product glows red under a UV light. This product is a light yellow powder material, and its XRD pattern, scanning electron microscope, excitation spectrum and emission spectrum shape are basically the same as those of Example 1, while the intensity of excitation spectrum and emission spectrum is different. Fluoromax‐4 fluorescence spectrometer (HORIBA Jobin Yvon Inc .) Detection, the emission spectrum of the product of this embodiment is as Figure 4 As shown, the spectral shape and position are the same as in Example 1, but the intensity is weaker than that of Example 1 because the con...

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Abstract

The invention discloses a lithium sodium fluosilicate red-light material for a white-light LED (Light-Emitting Diode) and a preparation method thereof. The material uses Li0.5Na1.5SiF6 as a substrateand uses Mn<4+> as an activating agent; the chemical composition is Li0.5Na1.5SiF6:Mn<4+>. During preparation, solid lithium nitrate, sodium fluoride, silica and potassium fluoromanganate are accurately weighed according to a stoichiometric ratio; all solids are put into an aqueous solution of HF; the agitation is carried out at normal temperature; afterwards, the suction filtration is carried out; the natural air-drying is carried out, so that the lithium sodium fluosilicate red-light material is obtained. A product has a maximum excitation wavelength located in a 467nm blue-light area, can be effectively excited by a GaN blue-light chip, and emits a red quadrivalent-manganese characteristic emission peak and has an emission spectrum located from 600nm to 650nm. The material can be used for supplementing a red component lacked in the white-light LED, so as to improve the color rendering index of the white-light LED. The product does not contain rare earth; a raw material is low in price and easy to obtain; the high-temperature sintering is not needed, and the lithium sodium fluosilicate red-light material is suitable for industrial production.

Description

technical field [0001] The present invention relates to a luminescent material, in particular to a red light material that can be used in white light LEDs; in particular to a lithium sodium fluorosilicate luminescent material with an excitation wavelength in the blue light region and an emission wavelength in the red light region and a preparation method thereof. Background technique [0002] White light LED is increasingly favored by people because of its remarkable energy-saving effect. Recently, the leading product in the white LED market is a two-color white LED packaged by yellow phosphor YAG:Ce and blue LED. Due to the lack of red light components in the spectrum of this type of white light LED, the color temperature is high and the color rendering index is low. , unable to meet the indoor lighting requirements. [0003] The red light component that can also be excited by the blue light chip is mixed into the yellow phosphor YAG:Ce, which can effectively improve the c...

Claims

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Application Information

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IPC IPC(8): C09K11/61H01L33/50
CPCC09K11/617H01L33/502H01L2933/0041Y02B20/00
Inventor 潘跃晓朱梦梦刘桂侯喜梅张磊
Owner WENZHOU UNIVERSITY
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