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Rare earth double-doped molybdate luminescent material emitting red light and preparation method and application thereof

A technology of luminescent materials and molybdates, applied in luminescent materials, chemical instruments and methods, climate sustainability, etc., can solve problems affecting the performance of white LEDs, lack of red components, low luminous intensity, etc., and achieve easy operation and preparation Simple method, high luminous intensity effect

Active Publication Date: 2020-11-03
NINGDE NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercialized white light LED is implemented by chips emitting blue light and YAG:Ce 3+ Yellow phosphor combination, but due to the lack of red components, its color rendering is relatively poor
In addition, white LEDs composed of near-ultraviolet LEDs and red, green, and blue phosphors have also become the main way to achieve white light. However, due to the commercial red phosphor Y 2 o 2 S: Eu 3+ The luminous intensity of blue-green powder is much lower than that of blue-green powder, and its stability is poor, which seriously affects the performance of white LED

Method used

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  • Rare earth double-doped molybdate luminescent material emitting red light and preparation method and application thereof
  • Rare earth double-doped molybdate luminescent material emitting red light and preparation method and application thereof
  • Rare earth double-doped molybdate luminescent material emitting red light and preparation method and application thereof

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Experimental program
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preparation example Construction

[0026] The preparation method of the red-emitting rare-earth double-doped molybdate luminescent material comprises the steps of:

[0027] (1) Preparation of mixed metal salt solution M: according to chemical formula Li 2 Eu 4-x (MoO 4 ) 7 :xA 3+ , the molar ratio of each element in 0<x≤0.4, respectively weigh the raw material compound that provides Li, the raw material compound that provides Eu, the raw material compound that provides rare earth element A, and the raw material compound that provides Mo and form a mixed metal salt solution M ( Usually a transparent solution);

[0028] The raw material compound that provides Li, the raw material compound that provides Eu, the raw material compound that provides rare earth element A, and the raw material compound that provides Mo can be oxides, nitrates, phosphates, carbonates, or silicates of corresponding metal elements, respectively. Wait. The raw material compound that the present invention provides Li selects Li for us...

Embodiment 1

[0036] (1) Preparation of mixed metal salt solution M: according to chemical formula Li 2 Eu 4 (MoO 4 ) 7 (ie chemical formula Li 2 Eu 4-x (MoO 4 ) 7 :xA 3+ , when x=0), the molar ratio of each element in) is weighed respectively Li 2 CO 3 solid, Eu 2 o 3 , and (NH 4 ) 6 Mo 7 o 24 4H 2 O; will be weighed Eu 2 o 3 Place in a beaker, add a small amount of concentrated nitric acid and heat to 70°C to dissolve until clear, then add (NH 4 ) 6 Mo 7 o 24 4H 2 O and Li 2 CO 3 Solid, stirred and dissolved to obtain mixed metal salt solution M;

[0037] (2) Preparation of B solution: C 6 h 8 o 7 ·H 2 O was dissolved in 20mL ethanol to form B solution;

[0038] (3) Preparation of sol-gel substance: slowly drop the B solution obtained in step (2) into the mixed metal salt solution M obtained in step (1), stir while adding, and react for 1 hour after the drop; Afterwards, according to the acidity and alkalinity of the mixed solution after the reaction, acid or...

Embodiment 2

[0043] (1) Preparation of mixed metal salt solution M: according to chemical formula Li 2 Eu 3.92 Yb 0.08 (MoO 4 ) 7 (ie chemical formula Li 2 Eu 4-x (MoO 4 ) 7 :xA 3+ In, A is the molar ratio of each element in Yb and x=0.08), respectively weigh Li 2 CO 3 solid, Eu 2 o 3 , Yb 2 o 3 and (NH 4 ) 6 Mo 7 o 24 4H 2 O; will be weighed Yb 2 o 3 and Eu 2 o 3 Place in a beaker, add a small amount of concentrated nitric acid and heat to 70°C to dissolve until clear, then add (NH 4 ) 6 Mo 7 o 24 4H 2 O and Li 2 CO 3 Solid, stirred and dissolved to obtain mixed metal salt solution M;

[0044] (2) Preparation of B solution: C 6 h 8 o 7 ·H 2 O was dissolved in 25mL ethanol to form B solution;

[0045] (3) Preparation of sol-gel substance: slowly drop the B solution obtained in step (2) into the mixed metal salt solution M obtained in step (1), stir while adding, and react for 1 hour after the drop; Afterwards, according to the acidity and alkalinity of th...

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Abstract

The invention relates to a rare earth double-doped molybdate light-emitting material emitting red light as well as a preparation method and an application of the material. The chemical formula of theearth double-doped molybdate light-emitting material is Li2Eu4-x(MoO4)7:xA<3+>, A represents at least one rare earth elements in chemical elements, and x is larger than 0 and smaller than or equal to0.4. The light intensity of the light-emitting material is obviously higher than that of single rare earth Eu<3+> ion doped Li2Eu4(MoO4)7 fluorescent powder, the rare earth double-doped molybdate light-emitting material has stable performance, high light intensity and high color purity, can be effectively excited by ultraviolet light at 395 nm, visible light at 465 nm and blue light at 536 nm, emits bright red light at 615 nm and corresponds to transition of <5>D0 of Eu<3+> to <7>F2, so that the fluorescent powder material can be used as red fluorescent powder for white LEDs excited by ultraviolet light and blue light chips.

Description

technical field [0001] The invention relates to a rare-earth double-doped molybdate luminescent material emitting red light, a preparation method and application thereof. Background technique [0002] Semiconductor white light diode lighting has become the fourth generation of lighting sources after incandescent lamps, fluorescent lamps and high-pressure mercury lamps due to its advantages of low voltage, small size, high luminous efficiency, good stability, and adjustable colors. At present, the commercialized white light LED is implemented by chips emitting blue light and YAG:Ce 3+ A combination of yellow phosphors, but due to the lack of red components, its color rendering is relatively poor. In addition, white LEDs composed of near-ultraviolet LEDs and red, green, and blue phosphors have also become the main way to achieve white light. However, due to the commercial red phosphor Y 2 o 2 S: Eu 3+ The luminous intensity of blue-green powder is much lower than that of b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7794H01L33/502Y02B20/00
Inventor 茹晶晶应少明赵兵
Owner NINGDE NORMAL UNIV