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Ultraviolet excited white light polyhydric lead-free perovskite fluorescent powder and preparation method thereof

A technology of fluorescent powder and perovskite structure, which is applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of high cost and low yield of liquid phase synthesis, and achieve high fluorescence quantum yield and emission spectrum Continuously adjustable effect

Active Publication Date: 2018-12-21
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, in view of the problems of low yield and high cost of liquid-phase synthesis adopted in the prior art, the present invention also improves the preparation method, and uses a solid-phase synthesis method to prepare a high-quality multi-component perovskite white light fluorescent material. The cost of the synthesis process is low, the process operation is simple, suitable for large-scale production applications, and very suitable for industrial production

Method used

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  • Ultraviolet excited white light polyhydric lead-free perovskite fluorescent powder and preparation method thereof
  • Ultraviolet excited white light polyhydric lead-free perovskite fluorescent powder and preparation method thereof
  • Ultraviolet excited white light polyhydric lead-free perovskite fluorescent powder and preparation method thereof

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preparation example Construction

[0032] The present invention adopts a solid phase method to prepare the above-mentioned phosphor, and the method includes the following steps:

[0033] (1) Weigh B according to the quantity ratio of the substance x: 1-x 1 X and B 2 X, according to the quantity ratio of the substance y: 1-y weigh B 3 X 3 And B 4 X 3 , While ensuring that B 1 X and B 2 The sum of the amount of matter in X and B 3 X 3 And B 4 X 3 The sum of the material quantity is equal. Weigh and B 3 X 3 , B 4 X 3 , B 1 X, B 2 For CsX with the same amount of X, mix the basic raw materials uniformly and grind them into powder to obtain the reaction precursor;

[0034] For example, specifically weighing B at room temperature 1 X x mmol and B 2 X(1-x)mmol, weigh B 3 X 3 x mmol and B 4 X 3 (1-x) mmol, and then weigh 2 mmol of AX, mix them uniformly, and grind into powder to obtain a reaction precursor. A is Cs + , B 1 , B 2 For Na + , Ag + , B 3 , B 4 In 3+ , Bi 3+ , X stands for X 1 , X 2 , X 3 For F - , Cl - , Br - . ...

Embodiment 1

[0041] In the preparation method of the perovskite phosphor in this embodiment, the specific preparation steps are as follows:

[0042] a) Clean the crucible with deionized water for 3 minutes, and then blow dry with a nitrogen gun.

[0043] b) Weigh 0.3366g CsCl, 0.0234g NaCl, 0.0861g AgCl, 0.221g InCl 3 , Mix well, grind finely with a mortar, and put it in a crucible.

[0044] c) Place the crucible in the muffle furnace, and set the temperature of the muffle furnace to 30°C and raise it to 460°C for 1 hour, keep it for 5 hours, and then naturally cool down to room temperature.

[0045] d) Take out the crucible in the muffle furnace, take out the powder in the crucible and grind it evenly in a mortar. Put it in the crucible and proceed to operation c.

[0046] e) Take out the crucible in the muffle furnace and take out the powder in the crucible to obtain Cs 2 Na 0.4 Ag 0.6 InCl 6 Phosphor.

Embodiment 2

[0048] In the preparation method of the perovskite phosphor in this embodiment, the specific preparation steps are as follows:

[0049] a) Clean the crucible with deionized water for 3 minutes, and then blow dry with a nitrogen gun.

[0050] b) Weigh 0.3366g CsCl, 0.0234g NaCl, 0.0762g AgF, 0.221g InCl 3 , Mix well, grind finely with a mortar, and put it in a crucible.

[0051] c) Place the crucible in the muffle furnace, and set the temperature of the muffle furnace to 30°C and raise it to 460°C for 1 hour, keep it for 5 hours, and then naturally cool to room temperature.

[0052] d) Take out the crucible in the muffle furnace, take out the powder in the crucible and grind it evenly in a mortar. Put it in the crucible and proceed to operation c.

[0053] e) Take out the crucible in the muffle furnace and take out the powder in the crucible to obtain Cs 2 Na 0.4 Ag 0.6 InF 0.6 Cl 5.4 Phosphor.

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Abstract

The invention discloses ultraviolet excited white light polyhydric lead-free perovskite fluorescent powder and a preparation method thereof. The fluorescent powder has a perovskite structure, and thechemical formula is shown as A2B<1>xB<2>1-xB<3>yB<4>1-yX<1>mX<2>nX<3>6-m-n, wherein x is larger than or equal to 0 and less than or equal to 1; y is larger than or equal to 0 and less than or equal to1; m is larger than 0 and less than or equal to 6; n is larger than 0 and less than or equal to 6; 6-m-n is larger than or equal to 0 and less than or equal to 6; moreover, A is Cs<+>; B<1>, B<2>, B<3> and B<4> are Na<+>, Ag<+>, In<3+> and Bi<3+> respectively; X<1>, X<2> and X<3> are F<->, Cl<-> and Br<-> respectively. Through the key composition of the polyhydric lead-free perovskite fluorescentpowder, the overall flow process setting of the corresponding preparation method, and improvements on parameter conditions adopted in each step, compared with the prior art, the preparation method has the advantages that the kinds of near ultraviolet excited single matrix fluorescent powder can be effectively increased, a continuous adjustable function for an excited spectrum and an absorption spectrum is realized, and the adjustment of the LED (Light-Emitting Diode) light-emitting color temperature is realized.

Description

Technical field [0001] The invention belongs to the field of luminescent materials. More specifically, it relates to an ultraviolet-excited white light multi-element non-lead perovskite phosphor and a preparation method thereof. Lead perovskite white phosphor. Background technique [0002] In recent years, with the development of the economy, the standard of living and quality have been continuously improved, and the requirements for lighting sources have been continuously improved. Energy-saving, environmentally-friendly and efficient lighting methods have attracted more and more attention from all parties. White LED light-emitting diodes have significant advantages such as small size, low energy consumption, fast response, long life, and no pollution. They are considered to be a new generation of lighting technology that has the potential to replace traditional lighting sources. [0003] The light-emitting diode itself is a monochromatic light source. For this reason, it is nece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62C09K11/74H01L33/50
CPCC09K11/628C09K11/7435H01L33/502Y02B20/00
Inventor 唐江牛广达胡满琛罗家俊刘婧李顺然张成
Owner HUAZHONG UNIV OF SCI & TECH
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