Red light fluorescent powder capable of being used for blue light excitation of white light LED and preparation method of red light fluorescent powder

A technology of red light phosphor and blue light excitation, which is applied in nanotechnology, chemical instruments and methods, nano optics, etc. for materials and surface science. It can solve the problems of poor moisture resistance, non-luminescence, inactivation, etc., and meet the reaction conditions The effect of low requirements, simple process and wide source of raw materials

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

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+ It is weak, and its weight ratio to yellow phosphor is as high as 2:1-3:1 in application; (2) The thermal stability is not high, and the luminous intensity is often affected by heat at the working temperature of white LEDs (about 150°C). Quenched and dropped to the original 70-80%; (3) Poor moisture resistance, in a 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 capable of being used for blue light excitation of white light LED and preparation method of red light fluorescent powder
  • Red light fluorescent powder capable of being used for blue light excitation of white light LED and preparation method of red light fluorescent powder
  • Red light fluorescent powder capable of being used for blue light excitation of white light LED and preparation method of red light fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 prepares [K 2 SiF 6 :0.06Mn 4+ @GQDs (6mg / mol) ](Abbreviated as: KSF:0.06Mn 4+ @GQDs (6mg / mol) )

[0044] (1) Take 24.0mL HF solution (mass concentration 40%) (V HF / W K2SiF6 =1.16mL / g), 12.00g KF 2H 2 O(W KF / W K2SiF6 =0.5), 0.9482g (6mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at normal temperature and pressure until the solid material is completely dissolved to obtain a purple solution; then 20.71g (94.0mmol) K 2 SiF 6 Powder was added to the above solution (KMnO 4 / (K 2 SiF 6 +KMnO 4 ), x=0.06), seal the mouth of the beaker with plastic wrap, stir and react at normal temperature and pressure for 48h to obtain reaction mixture i, reaction mixture i is suction filtered, washed with absolute ethanol and then heated at 80°C Dry for 3 hours to obtain the uncoated sample, namely K 2 MF 6 :xMn 4+ Red phosphor crystal ((No. 01) sample).

[0045] (2) Slowly add 600 μL of green fluorescent GQDs ...

Embodiment 2

[0054] Embodiment 2 prepares [K 2 SiF 6 :0.03Mn 4+ @GQDs (6mg / mol) ](Abbreviated as: KSF:0.03Mn 4+ @GQDs (6mg / mol) )

[0055] Get 20.3mL HF solution (mass concentration 40%) (V HF / W K2SiF6 =0.95mL / g), 8.56g KF 2H 2 O(W KF / W K2SiF6 =0.40), 0.4741g (3.0mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at normal temperature and pressure until the solid raw material is completely dissolved to obtain a purple-red solution; then 21.40g (97.0mmol) K 2 SiF 6 Powder was added to the above solution (KMnO 4 / (K 2 SiF 6 +KMnO 4 ), x=0.03), seal the mouth of the beaker with plastic wrap, stir and react at room temperature and pressure for 70h, then slowly add 600 μL of 1mg / mL to the above reaction mixture with a micropipette under stirring. After adding the green fluorescent GQDs solution, continue to stir for 25 minutes, then transfer the above mixture to a water heating tank; then put the sealed water heating tank in an oven, k...

Embodiment 3

[0058] Embodiment 3 prepares [K 2 TiF 6 :0.05Mn 4+ @GQDs (4mg / mol) ](abbreviated as: KTF:0.05Mn 4+ @GQDs (6mg / mol) )

[0059] (1) Take 21.89mL HF solution (mass concentration 40%) (V HF / W K2TiF6 =0.96mL / g), 10.26g KF 2H 2 O(W KF / W K2TiF6 =0.45), 0.7902g (5mmol) KMnO 4 The powder is placed in a 100mL plastic beaker, stirred with a magnetic stirrer at normal temperature and pressure until the solid raw material is completely dissolved to obtain a purple-red solution; then 22.81g (95.0mmol) K 2 TiF 6 Powder was added to the above solution (KMnO 4 / (K 2 TiF 6 +KMnO 4 ), x=0.05), seal the mouth of the beaker with plastic wrap, stir and react at normal temperature and pressure for 40h to obtain reaction mixture i, reaction mixture i is filtered by suction, washed with absolute ethanol and then heated at 80°C Dry for 3 hours to obtain the uncoated sample, namely K 2 MF 6 :xMn 4+ Red phosphor crystal ((No. 02) sample).

[0060] (2) Slowly add 400 μL of green fluo...

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Abstract

The invention belongs to the field of fluorescent powder preparation, and particularly relates to red fluorescent powder capable of being used for blue light excitation of a white light LED and a preparation method of the red fluorescent powder, and the general formula of the combination ratio of the prepared red fluorescent powder is K2MF6: xMn < 4 + > (at) GQDs (ymg/mol), wherein M is Si or Ti; x is the mole fraction of Mn < 4 + > doping, and x is more than 0 and less than or equal to 0.06; the GQDs are green light graphene quantum dots; y is the content of GQDs in the red-light fluorescent powder, 0 < y < = 7, and the unit is mg/mol. The Mn < 4 + >-doped fluoride red-light fluorescent powder coated with the green-light graphene quantum dots can be excited by blue light emitted by an InGaN chip, has excellent high-temperature fluorescence performance, heat resistance and water resistance, and has a good market prospect.

Description

technical field [0001] The invention belongs to the field of fluorescent powder preparation, and in particular relates to a red fluorescent powder which can be used for blue light excitation of white LEDs and a preparation 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/61C09K11/02C09K11/67B82Y30/00B82Y20/00H01L33/50
CPCC09K11/616C09K11/65C09K11/675C09K11/02B82Y20/00B82Y30/00H01L33/502Y02B20/00
Inventor 廖森黄毅黄映恒于艳李燕石云浩
Owner 广西经正涂料有限公司
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