Red-light fluorescent powder excited by blue light and synthesis method of red-light fluorescent powder

A red-light phosphor and blue-light excitation technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of no luminescence, decreased luminous intensity, low thermal stability, etc., and achieve the effect of simple process

Pending Publication Date: 2022-03-25
广西经正涂料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But existing Mn 4+ Doped fluoride red phosphors also have some disadvantages to overcome: (1) The luminous intensity is higher than that of yellow phosphors YAG:Ce 3+ The weight ratio of it to yellow light powder is as high as 2:1-3:1 during application; (2) The thermal stability is not high, and the luminous intensity is often caused by thermal quenching at the working temperature of white LEDs (about 150°C). extinguished and dropped to 70-80% of the original; (3) poor moisture resistance, in humid environment, Mn 4+ Easily hydrolyzed into opaque MnO 2 , and then rapidly deactivate without emitting light

Method used

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  • Red-light fluorescent powder excited by blue light and synthesis method of red-light fluorescent powder
  • Red-light fluorescent powder excited by blue light and synthesis method of red-light fluorescent powder
  • Red-light fluorescent powder excited by blue light and synthesis method of red-light fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: preparation [Na 2 SiF 6 :0.01Mn 4+ ,0.07Li + -CA]

[0038] (1) First, put 4.928g (46.5mmol) Na 2 CO 3 and 0.16769g (7mmol) LiOH were added to 40mL of deionized water, stirred until completely dissolved to obtain an alkaline solution; then the alkaline solution was added dropwise to 28.82g (100mmol) of H 2 SiF 6 solution (mass percentage is 50%), dropwise is completed and continue to stir for 10min, until the pH is 7.0, then seal the mouth of the beaker with a plastic wrap and place it in an oven at 80°C for 3h; finally remove the plastic wrap and placed in an oven at 125 ° C for 3 hours to obtain the intermediate Na 2 SiF 6 :0.07Li + powder;

[0039] (2) get 11.10mLHF solution (mass concentration 40%) (V HF / W 基质 =3mL / g), 0.370g KF·2H 2 O(W KF / W K2SiF6 =0.1), 0.0316g (0.2mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at room temperature and normal pressure until the solid material is completely...

Embodiment 2

[0043] Embodiment 2: preparation [Na 2 SiF 6 :0.04Mn 4+ ,0.14Li + -CA]

[0044] (1) First, put 4.558g (43.0mmol) Na 2 CO 3 and 0.3353g (14mmol) LiOH were added to 40mL of deionized water, stirred until completely dissolved to obtain an alkaline solution; then the alkaline solution was added dropwise to 28.82g (100mmol) of H 2 SiF 6 (50%, mass percent content) in the solution, dropwise is finished and continue to stir 15min (pH is 7.0), then seal the mouth of the beaker with plastic wrap and place it in an oven at 90°C for 3.5h of insulation reaction; Remove the plastic wrap and dry in an oven at 120°C for 3.5 hours to obtain the intermediate Na 2 SiF 6 :0.14Li + powder;

[0045] (2) get 12.49mLHF solution (mass concentration 40%) (V HF / W 基质 =3.5mL / g), 0.714g KF 2H 2 O(W KF / W 基质 =0.2), 0.1264g (0.8mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at room temperature and normal pressure until the solid material is comp...

Embodiment 3

[0049] Embodiment 3: preparation [Na 2 SiF 6 :0.07Mn 4+ ,0.04Li + -CA]

[0050] (1) First, put 5.087g (48.0mmol) Na 2 CO 3 and 0.0958g (4mmol) LiOH were added to 40mL of deionized water, stirred until completely dissolved to obtain an alkaline solution; then the alkaline solution was added dropwise to 28.82g (100mmol) of H 2 SiF 6 (50%, mass percent content) in the solution, dropwise is completed and continue to stir for 20min (pH is 7.0), then seal the mouth of the beaker with plastic wrap and place it in an oven at 100°C for 2.5h of insulated reaction; Remove the plastic wrap and dry in an oven at 115°C for 2.5 hours to obtain the intermediate Na 2 SiF 6 :0.04Li + powder;

[0051] (2) Take 13.94mL HF solution (mass concentration 40%) (V HF / W 基质 =4.0mL / g), 1.046g KF 2H 2 O(W KF / W K2SiF6 =0.3), 0.2214g (1.4mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at room temperature and normal pressure until the solid materi...

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Abstract

The invention belongs to the technical field of preparation of fluorescent powder, and particularly relates to red fluorescent powder excited by blue light, the general formula of which is Na2SiF6: xMn < 4 + >, yLi < + >-CA, wherein CA represents surface passivation with citric acid, x represents that x is greater than or equal to 0.01 and less than or equal to 0.14, and y represents that y is greater than or equal to 0.01 and less than or equal to 0.14. The invention also relates to a preparation method of the red-light fluorescent powder. The preparation method comprises the following steps: (1) preparing NaSiF6: yLi powder; (2) preparing Na2SiF6: xMn < 4 + >, yLi < + > red fluorescent powder crystals; and (3) preparing Na2SiF6: xMn < 4 + >, yLi < + >-CA red fluorescent powder crystals. The obtained red-light fluorescent powder has the characteristics of long-range good water resistance, high luminous intensity and thermal stability.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder preparation, and in particular relates to a red fluorescent powder excited by blue light and a synthesis method thereof. Background technique [0002] Diodes (white LEDs) have the advantages of high luminous efficiency, energy saving, long life, low energy consumption, and environmental protection. Therefore, LEDs are regarded as a new generation of solid-state light-emitting devices. At present, the most mature and commercialized white LEDs are based on blue chip and yellow phosphor YAG:Ce 3+ Realized by the combination of yellow light phosphor YAG:Ce 3+ Absorption of the blue light emitted by the blue chip produces yellow fluorescence, which is combined with the chip's blue light to obtain white light. Because this kind of white light lacks red light components, it has disadvantages such as high color temperature and low color purity, so it is difficult to apply to general lighting...

Claims

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Application Information

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IPC IPC(8): C09K11/61C09K11/02
CPCC09K11/617C09K11/025
Inventor 廖森黄毅黄映恒钟雪邓代书李燕石云浩
Owner 广西经正涂料有限公司
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