Fluorine titanium salt red-light material for white LED with two primary colors and preparation method of material

A dichroic and white light technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of high concentration of etching solution, unfavorable large-scale industrial production, etc., and achieve the effect of high absorption efficiency

Inactive Publication Date: 2015-06-17
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods reported in the literature often use expensive metal elements (such as titanium, germanium, silicon) as raw materials, and the concentration of etching solution is high (40% HF solution), which is not conducive to large-scale industrial production

Method used

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  • Fluorine titanium salt red-light material for white LED with two primary colors and preparation method of material
  • Fluorine titanium salt red-light material for white LED with two primary colors and preparation method of material
  • Fluorine titanium salt red-light material for white LED with two primary colors and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 0.8767g BaF 2 Solid, 1.7ml tetrabutyl titanate solution, 5ml KMnO with a concentration of 0.05mol / L 4 solution, 10ml of HF aqueous solution with a volume concentration of 40%, and then add 85ml of deionized water to keep the total volume of the reaction solution at 100ml. Stir magnetically for 20 minutes, put it into a stainless steel reaction kettle, put it in an oven at 120°C for 12 hours, take it out, and let it cool naturally. Suction filtration, washing with water, and natural drying to obtain a white powder. The product glows red under a UV light. Its XRD (detected by Bruker D8Advance X-ray diffractometer) is as follows figure 1 As shown, XRD shows that the product is pure BaTiF 6 Mutually. The scanning electron microscope is measured on Nova NanoSEM200, under the action of electron beam; as figure 2 As shown, magnified by 20,000 times, it is observed that the microscopic appearance of the product is fine granular, the size distribution is narrow, the d...

Embodiment 2

[0028] Add 0.8767g BaF 2 Solid, 1.7ml tetrabutyl titanate solution, 10ml KMnO with a concentration of 0.05mol / L 4 solution, 10ml of HF aqueous solution with a volume concentration of 40%, and then add 80ml of deionized water to keep the total volume of the reaction solution at 100ml. Stir magnetically for 20 minutes, put it into a stainless steel reaction kettle, put it in an oven at 120°C for 12 hours, take it out, and let it cool naturally. Suction filtration, washing with water, and natural drying to obtain a white powder. The product glows red under a UV light. Using a Fluoromax‐4 fluorescence spectrometer (HORIBA Jobin Yvon Inc.), the luminescent properties of the product were detected at room temperature, such as image 3 As shown, the excitation spectrum of the material consists of three broadband bands located at 250nm, 350nm, and 460nm, and its largest excitation band (460nm) completely matches the blue light emitted by the GaN blue chip. 650nm peak composition, t...

Embodiment 3

[0030] Add 0.8767g BaF 2 Solid, 1.7ml tetrabutyl titanate solution, 20ml KMnO with a concentration of 0.05mol / L 4 solution, 10ml of HF aqueous solution with a volume concentration of 40%, and 70ml of deionized water were added to keep the total volume of the reaction solution at 100ml. Stir magnetically for 20 minutes, put it into a stainless steel reaction kettle, put it in an oven at 120°C for 12 hours, take it out, and let it cool naturally. Suction filtration, washing with water, and natural drying to obtain a white powder. The product glows red under a UV light. The color coordinates of the material are located at: x=0.62, y=0.37.

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Abstract

The invention discloses a fluorine titanium salt red light material for a white LED with two primary colors and a preparation method of the material. The chemical composition of the material is Bati(1-x)F6: xMn <4+>, wherein x ranges from 0.25% to 2.5%. The preparation method comprises the steps as follows: tetrabutyl titanate or TiO2 is taken as a titanium source, BaF2 is taken as a barium source, KMnO4 is taken as an active ion manganese source, an HF aqueous solution with the concentration ranging from 4% to 10% is taken as a medium or a fluorinating agent, a reaction is performed for 3-12 hours at the temperature ranging from the room temperature to 180 DEG C, then suction filtration and drying are performed, and white powder is obtained. The product emits bright red light under an ultraviolet lamp, the maximum excitation band of the product is matched with blue light emitted by a GaN blue light chip completely, and the emission spectrum is located in a red zone. The material can be applied to the white LED with two primary colors to improve the CRI (color rendering index) of the LED. The product has uniform and slight particles, contains no rare earth, has a simple preparation method and is suitable for industrial production.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a fluorine-titanium salt red light material for a dichroic white light LED. It specifically relates to a fluorotitanate luminescent material whose excitation wavelength is in the blue light region and whose emission wavelength is in the red light region. Background technique [0002] Semiconductor white light LED has excellent characteristics that cannot be compared with traditional light sources: power saving, adjustable light, vibration resistance, not easy to damage, instant start, no flicker frequency, long service life, etc. GaN-based white LEDs with yellow and blue dichroic colors composed of blue GaN chips and yellow phosphor YAG:Ce are now attracting great attention. This type of dichroic white LEDs has the smallest Stocks shift (energy loss) in white lighting invented so far. The electroluminescent blue light (450-470nm) of the GaN chip excites the phosphor YAG:Ce to produce 55...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67
Inventor 潘跃晓江先禹金侃君顾勤杰连漪梦王稼国
Owner WENZHOU UNIV
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