Near ultraviolet excitation double perovskite fluorescent powder for white light LED and preparation method thereof

A double perovskite and near-ultraviolet technology is applied in the direction of chemical instruments and methods, luminescent materials, and the use of gas discharge lamps. The effect of low power consumption and high luminous intensity

Inactive Publication Date: 2014-02-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is for the existing Eu 3+ doped Ln 2 BMO 6 The luminous intensity and luminous color of fluorescent pink are difficult to meet the actual needs of white LEDs and the urgent needs of dev

Method used

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  • Near ultraviolet excitation double perovskite fluorescent powder for white light LED and preparation method thereof
  • Near ultraviolet excitation double perovskite fluorescent powder for white light LED and preparation method thereof
  • Near ultraviolet excitation double perovskite fluorescent powder for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 # (Gd 0.9 PR 0.1 ) 2 MgTiO 6

[0033] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

[0034] ① Weigh the solid powder raw material according to the composition in Table 1, first dissolve the Ti source in absolute ethanol (the amount of ethanol added is approximately equal to the volume of the Ti source); dissolve citric acid in deionized water; mix the Ti source ethanol solution with Gd , Pr, Mg metal ion nitrate solution mixed, stirred and heated; then the completely dissolved citric acid solution was adjusted to neutral with ammonia water and added to the mixed solution; quickly adjusted the pH of the mixed solution to 4 with ammonia water and nitric acid; Ionized water ensures that the total concentration of metal ions in the entire solution system is 0.2mol / L, and the whole process has been stirred and heated (temperature 35°C);

[0035] ②Put the prepared solution on a magnetic stirrer, stir in a sea...

Embodiment 2

[0041] Example 2 # (Gd 0.9 Dy 0.1 ) 2 MgSnO 6

[0042] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0043] ① Weigh the solid powder raw material according to the composition in Table 1, first dissolve citric acid in deionized water; mix the Sn source with the nitrate solution of Gd, Dy, Mg metal ions, stir and heat; then dissolve the completely dissolved citric acid Add the solution to the mixed solution after adjusting it to neutral with ammonia water; quickly adjust the pH of the mixed solution to 4.5 with ammonia water and nitric acid; add deionized water to ensure that the total concentration of metal ions in the entire solution system is 0.3mol / L, and stir and heat the whole process ( temperature 30°C);

[0044] ②Put the prepared solution on a magnetic stirrer, stir in a sealed container for 15 minutes, then unseal, heat at 55°C and keep stirring for 40 minutes to form a sol; then increase the heating temperature...

Embodiment 3

[0050] Example 3 # (Gd 0.7 PR 0.3 ) 2 MgTi 0.5 sn 0.5 o 6

[0051] Composition as in Table 1 3 # Shown, specific preparation method comprises the following steps:

[0052] ①Weigh the solid powder raw material according to the composition in Table 1, first dissolve the Ti source in absolute ethanol (the amount of ethanol added is approximately equal to the volume of the Ti source); dissolve citric acid in deionized water; dissolve the Ti source ethanol solution, Sn Mix the source with the nitrate solution of Gd, Pr, and Mg metal ions, stir and heat; then adjust the completely dissolved citric acid solution to neutral with ammonia water and add it to the mixed solution; quickly adjust the pH of the mixed solution to 5 with ammonia water or nitric acid ;Add deionized water to ensure that the total concentration of metal ions in the entire solution system is 0.4mol / L, and keep stirring and heating throughout the whole process (temperature 50°C);

[0053] ②Put the prepared...

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Abstract

The invention relates to a near ultraviolet excitation double perovskite fluorescent powder for a white light LED and a preparation method thereof. The fluorescent powder is characterized by having a structural formula of (Gd1-xRE x)2MgMO6; M represents one or two selected from Ti, Sn and Zr, but M does not represents Zr individually and account for no more than 50% by molar ratio; and RE is one selected from rare earth elements Pr and Dy, wherein x satisfies the following relation: 0.1<=x<=0.5. The fluorescent powder is prepared by a sol-gel method using citric acid as a complexing agent. The fluorescent material provided by the invention emits Pr<3+> or Dy<3+> characteristic red light or near white light, and the two ions have strong absorption of excitation energy in the fluorescent powder, high luminous intensity, good color purity and good color rendering. The system gains greatly increased red light emitting intensity and achieves near white light output.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, in particular to a near-ultraviolet excited double perovskite fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] White LEDs, as a new type of solid-state lighting device, have been widely used in flat panel display, road lighting and other fields due to their advantages of energy saving, high efficiency, small size, no pollution and planarization. [0003] At present, in the technical scheme of exciting red, green and blue phosphors with near ultraviolet light to obtain white light LEDs, the red phosphors used are such as CaS:Eu 2+ , Y 2 o 2 S:Eu 3+ etc. The luminous intensity is much lower than that of the co-excited BaMgAl 10 o 17 :Eu 2+ Blue and ZnS:Cu + ,Al 3+ Green phosphor. In addition, the general chemical stability of sulfide, the pollution caused by sulfur gas released during use and the wider red emission b...

Claims

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Application Information

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IPC IPC(8): C09K11/67C09K11/66H01L33/50
CPCY02B20/181Y02B20/00
Inventor 张乐张其土顾路顺陆洲
Owner NANJING UNIV OF TECH
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