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Blue phosphor suitable for violet light excitation, its preparation method and light-emitting device

A technology of blue fluorescent powder and purple light, which is applied in the direction of luminescent materials, chemical instruments and methods, semiconductor devices, etc., can solve the problems affecting LED light efficiency and stability, low fluorescence quantum efficiency, poor stability, etc., to improve light efficiency and stability, increase the fluorescence intensity, and ensure the effect of stability

Active Publication Date: 2021-06-25
XUYU OPTOELECTRONICSSHENZHEN CO LTD
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AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a blue fluorescent powder suitable for purple light excitation, so as to improve the fluorescence quantum efficiency and poor stability when the phosphate system phosphor is excited by the purple light chip, and the excitation spectrum is between 400-420nm The intensity is too low, which seriously affects the technical problems of LED light efficiency and stability

Method used

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  • Blue phosphor suitable for violet light excitation, its preparation method and light-emitting device
  • Blue phosphor suitable for violet light excitation, its preparation method and light-emitting device
  • Blue phosphor suitable for violet light excitation, its preparation method and light-emitting device

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preparation example Construction

[0059] According to a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned blue phosphor suitable for excitation by violet light, comprising the following steps:

[0060] (a) The nitrate solution of A, the first citrate solution and the first acid metal salt solution are mixed uniformly, and heated to obtain the precursor I;

[0061] (b) Mix the nitrate solution of M, the second citrate solution, the second acid metal salt solution and the ammonium chloride solution evenly, and heat to obtain the precursor II;

[0062] (c) Precursor I, Precursor II and Eu oxide are uniformly mixed and calcined to obtain a blue phosphor suitable for excitation by violet light.

[0063] The blue fluorescent powder suitable for purple light excitation provided by the present invention is prepared by liquid phase method respectively after precursor I and precursor II, and then the oxides of precursor I, precursor II and Eu are calcined. ...

Embodiment 1

[0089] This embodiment provides a blue phosphor suitable for excitation by violet light, whose chemical formula is Sr 4.85 La 0.05 (PO 4 ) 3 Cl 1.05 :0.1Eu 2+ , which is prepared according to the following steps:

[0090] (1) 50mL La(NO 3 ) 3 , 10mL concentration of 0.01mol / L sodium citrate solution (buffer) and 25mL concentration of 0.2mol / L Na 3 PO 4 solution, put it into a glass container, adjust the pH value to 10-11, heat at 120°C, react for 60min, and dry at 80°C to obtain the precursor I;

[0091] (2) 485 mL of Sr(NO 3 ) 2 Solution, 50mL concentration is 0.01mol / L sodium citrate solution (buffer), 295mL concentration is 1.0mol / LNa 3 PO 4 Solution and 210mL concentration is 0.5mol / LNH 4 Put the Cl solution into a glass container, adjust the solution to a pH of 8-10, heat at 120°C, react for 110 minutes, and dry to obtain the precursor II;

[0092] (3) Precursor I, nano-precursor II and Eu 2 o 3 , mixed evenly according to the mass ratio of 1.17:382.21:1.7...

Embodiment 2-28

[0095] Embodiment 2-28 provides a kind of general chemical formula respectively: M 5-x-y A y (XO 4 ) 3 Cl 1+y :xEu 2+ The blue fluorescent powder suitable for purple light excitation, its specific chemical formula is shown in Table 1, the preparation method of Example 2-28 is the same as that of Example 1, only the adjustment of raw materials and quality is carried out according to its specific structure, and no more details are given here. .

[0096] Table 1

[0097]

[0098]

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Abstract

The invention provides a blue fluorescent powder suitable for purple light excitation and its preparation method and light-emitting device, and relates to the technical field of luminescent materials. The general chemical formula of the blue fluorescent powder suitable for purple light excitation is: M 5‑x‑y A y (XO 4 ) 3 Cl 1+y :xEu 2+ , where M is at least one of Ca, Sr, Ba, Mg or Zn, A is La, Y or Sc, X is at least one of P, V, Mo, and 0.001≤x≤0.2, 0.05≤y≤ 4. The above-mentioned blue phosphor suitable for purple light excitation has improved the technical problems of low fluorescence quantum efficiency and poor stability of phosphors in the phosphate system. The blue phosphor suitable for purple light excitation provided by the present invention simultaneously introduces A Elements and chlorine elements, and P, V or Mo elements are introduced into the structure, which effectively improves the stability and light efficiency of the blue phosphor, thereby improving the light efficiency and stability of the LED.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a blue fluorescent powder suitable for excitation by violet light, a preparation method thereof and a luminescent device. Background technique [0002] In recent years, with the rapid development of white light LED technology, people's pursuit of white light LED quality has gradually increased. High-quality, continuous spectrum, and healthy lighting sources are gradually favored by researchers and consumers. Considering the effect of blue light on retinal epithelial hormones and melatonin inhibition, purple light excitation of red, green, and blue phosphors to achieve white light has become a research hotspot at home and abroad. [0003] Existing blue phosphors mainly include aluminate system (BaMgAl 11 o 17 : Eu 2+ ), silicate system (BaZnSiO 4 : Ce 3+ ), phosphate system (Sr 5 (PO 4 ) 3 Cl:Eu 2+ ), among which the phosphate system blue phosphor has the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86H01L33/50
Inventor 蔡金兰陈磊林金填曹小兵
Owner XUYU OPTOELECTRONICSSHENZHEN CO LTD
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