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A kind of red fluorescent powder for near ultraviolet light excitation and preparation method thereof

A technology of red phosphor and near-ultraviolet light, which is applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., and can solve undiscovered problems

Active Publication Date: 2021-07-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

La synthesized by hydrothermal method 2 Mo 2 o 9 :Eu 3+ Red phosphor is very sensitive to near ultraviolet light, has strong absorption spectrum and red light emission spectrum, and is relatively easy to prepare, which has very important practical significance, but no relevant reports have been found so far

Method used

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  • A kind of red fluorescent powder for near ultraviolet light excitation and preparation method thereof
  • A kind of red fluorescent powder for near ultraviolet light excitation and preparation method thereof
  • A kind of red fluorescent powder for near ultraviolet light excitation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1, weigh 3.20mmol of La (No 3 ) 3 ·nH 2 O was dissolved in 25 mL of deionized water to form A solution, 6.40 mmol of Li2 MoO 4 Dissolve in 20mL deionized water to form solution B; stir with a magnetic stirrer for 30min;

[0030] Step 2, use a dropper to add solution A to solution B drop by drop to ensure that the solution is fully mixed, and solution B is constantly stirring during the dropwise addition, and finally a mixed solution C is formed;

[0031] Step 3: Stir the C solution for 30 minutes, adjust the pH to 9.0 with 0.1mol / L lithium hydroxide solution and 5% dilute nitric acid solution to form solution H;

[0032] Step 4, move the H solution into the p-polyphenyl liner with a filling degree of 65%, react in a stainless steel reactor at 240°C for 24 hours, and form a white precipitate;

[0033] Step 5, washing the white precipitate obtained in step 4 with deionized water and ethanol for 2 to 3 times, and centrifuging with a centrifuge at 10000r / min for 3m...

Embodiment 2

[0039] (1) Weigh 3.04mmol of La(No 3 ) 3 ·nH 2 O was dissolved in 25 mL of deionized water to form A solution, 6.40 mmol of Li 2 MoO 4 Dissolve in 20mL deionized water to form solution B; stir with a magnetic stirrer for 30min, then measure 1.6mL of Eu(NO 3 ) 3 solution;

[0040] (2) First add solution A to solution B dropwise using a dropper, during which solution B is constantly stirring to form solution C, and then add Eu(NO 3 ) 3 The solution is added to the mixed solution C drop by drop using a dropper to form a D solution;

[0041] (3) Stir the D solution for 30 minutes, adjust the pH to 9.00 with 0.1mol / L lithium hydroxide solution and 5% dilute nitric acid solution to form the precursor solution E;

[0042] (4) Move the E solution into the p-polystyrene liner with a filling degree of 67%, react in a stainless steel reactor at 240°C for 24 hours, and form a white precipitate F;

[0043] (5) Rinse the precipitate F with deionized water and ethanol for 2 to 3 tim...

Embodiment 3

[0048] (1) Weigh 2.86mmol of La(No 3 ) 3 ·nH 2 O was dissolved in 25 mL of deionized water to form A solution, 6.42 mmol of Li 2 MoO 4 Dissolve in 20mL deionized water to form solution B; stir with a magnetic stirrer for 30min, then measure 3.5mL of Eu(NO 3 ) 3 solution;

[0049] (2) First add solution A to solution B dropwise using a dropper, during which solution B is constantly stirring to form solution C, and then add Eu(NO 3 ) 3 The solution is added to the mixed solution C drop by drop using a dropper to form a D solution;

[0050] (3) Stir the solution D for 35 minutes, adjust the pH to 9.13 with a 0.15 mol / L lithium hydroxide solution and a 5% dilute nitric acid solution to form a precursor solution E;

[0051] (4) Move the precursor solution E into the p-polyphenyl liner with a filling degree of 70%, react in a stainless steel reactor at 240°C for 24 hours, and form a white precipitate F;

[0052] (5) Rinse the precipitate F with deionized water and ethanol f...

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Abstract

The invention discloses a red fluorescent powder for near-ultraviolet light excitation and a preparation method thereof. According to the stoichiometric ratio 2:(1-x):x, respectively take Li 2 MoO 4 Powder, La(No 3 ) 3 ·nH 2 O powder and Eu(NO 3 ) 3 The solution is used as raw material, where x=0~1.0; hydrothermal reaction at 240°C for 24h, then the precursor is centrifuged and dried at 525~550°C for 3~4h, and finally taken out and ground to obtain the target product La 1.0‑x Mo 2 o 9 :xEu 3+ Red fluorescent powder; using hydrothermal method to form a pure phase structure phosphor, the cost is low, after the hydrothermal reaction, the overall process is simple; the raw materials are lithium molybdate, hydrated lanthanum nitrate, europium nitrate and lithium hydroxide, and Compared with the target product, the amount of introduced impurity ions is small, which can improve the purity of the product; the doping method of the present invention helps crystallization, Li + The addition of ions promotes the formation of crystals; the phosphor has a strong charge transfer band, which has the highest intensity under the excitation of near-ultraviolet light from 335nm to 350nm, and its color coordinates are similar to standard red light, with high color purity and luminous intensity. Excellent performance.

Description

technical field [0001] The invention relates to the field of research on rare earth luminescent materials, in particular to a red fluorescent powder for excitation by near-ultraviolet light and a preparation method thereof. Background technique [0002] Rare earth luminescent materials are materials with good luminescent properties composed of host and activator ions. The luminescent properties are mainly determined by the special electronic structure of rare earth ions. The spectral lines include sharp line spectrum and band spectrum. The sharp line spectrum comes from 4f- Transitions within the 4f configuration, the band spectrum consists of transitions between 4f-5d energy levels and charge transfer bands. Rare earth luminescent materials occupy an important position in all luminescent materials because of their excellent luminescent properties, rich spectral lines, good physical and chemical stability and high photoluminescence conversion efficiency. [0003] As a new g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7794H01L33/502
Inventor 刘运朱毅刘丁菡王凯白少杰王蓉叶森
Owner SHAANXI UNIV OF SCI & TECH
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