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A rare earth ion-activated ultraviolet-excited white light-emitting tungstate nano-phosphor powder rich in red light components and its preparation method

A technology of nano-fluorescent powder and rare earth ions, applied in nano-optics, nano-technology, luminescent materials, etc., can solve the problems of limited phosphor powder and lack of red phosphor powder, and achieve simple manufacturing process, uniform particle size distribution, and easy operation Effect

Inactive Publication Date: 2014-10-22
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, phosphors that can meet these conditions are very limited, especially the lack of efficient red phosphors

Method used

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  • A rare earth ion-activated ultraviolet-excited white light-emitting tungstate nano-phosphor powder rich in red light components and its preparation method
  • A rare earth ion-activated ultraviolet-excited white light-emitting tungstate nano-phosphor powder rich in red light components and its preparation method
  • A rare earth ion-activated ultraviolet-excited white light-emitting tungstate nano-phosphor powder rich in red light components and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 0.438gDy(NO 3 ) 3 ·5H 2 O and 0.577gNa 2 WO 4 2H 2 O was dissolved in 20ml and 40ml deionized water, respectively.

[0029] (2) the resulting Na 2 WO 4 The solution was added dropwise to the metal nitrate solution, and after the dropwise addition was completed, the reaction was continued for 30 minutes.

[0030] (3) The obtained white precipitate was centrifuged, washed with deionized water, dried at 100° C. for 10 hours, and the product was ground evenly and then placed in a crucible.

[0031] (4) Put the above-mentioned raw materials into an alumina crucible, put it into the constant temperature zone of the high-temperature sintering furnace, raise the high-temperature sintering furnace to 900°C for roasting, keep the temperature constant for 1 hour, and take it out at high temperature or down to room temperature with the furnace. Promptly get the Na of the present invention 2 Dy 4 (WO 4 ) 7 Phosphor matrix.

Embodiment 2

[0033] Weigh 0.434gDy(NO 3 ) 3 ·5H 2 O,0.005gEu(NO 3 ) 3 ·6H 2 O and 0.577gNa 2 WO 4 2H 2 O is dissolved in 20ml and 40ml deionized water respectively, all the other conditions are the same as embodiment 1, promptly obtain Na of the present invention after testing. 2 Dy 4 (WO 4 ) 7 :1mol%Eu 3+ .

Embodiment 3

[0035] Weigh 0.425gDy(NO 3 ) 3 ·5H 2 O,0.013gEu(NO 3 ) 3 ·6H 2 O and 0.577gNa 2 WO 4 2H 2 O is dissolved in 20ml and 40ml deionized water respectively, all the other conditions are the same as embodiment 1, promptly obtain Na of the present invention after testing. 2Dy 4 (WO 4 ) 7 :3mol%Eu 3+ .

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Abstract

The invention belongs to the technical field of luminous materials, in particular to rare earth ion activated and ultraviolet excited white light emitting tungstate nano fluorescent powder rich in a red light component and a preparation method thereof. The chemical expression of the white light emitting tungstate fluorescent powder rich in the red light component is Na2Dy4(WO4)7:Eu<3+>. The preparation method comprises the following steps of: weighing quantitative analytically-pure Na2WO4.2H2O, Eu(NO3)3.6H2O and Dy(NO3)3.5H2O according to the stoichiometric ratio of the chemical expression, and synthesizing the fluorescent powder by adopting a co-precipitation method. The preparation method is simple, and the synthesized tungstate phosphor has the advantages of strong ultraviolet absorption and high red light emitting brightness and is an ideal fluorescent material applied in the fields of white LEDs (Light-Emitting Diodes), displays and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a rare-earth ion-activated ultraviolet-excited white light-emitting tungstate nano-fluorescent powder rich in red light components and a manufacturing method thereof. Background technique [0002] White LEDs have advantages over existing lighting equipment in terms of energy saving, environmental protection and longevity, and are a promising new generation of solid-state lighting devices. White LED devices require phosphors to have strong absorption and down-conversion luminescence properties in the near-ultraviolet or blue light region emitted by semiconductor GaN or InGaN-based LED chips. The absorption spectrum of the phosphor powder for white light LEDs must have a large spectral overlap with the emission spectrum of the LED chip used in order to obtain high light conversion efficiency, and the phosphor powder must have high quantum efficiency, excellent thermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78B82Y20/00B82Y40/00
CPCY02B20/181Y02B20/00
Inventor 华瑞年张伟袁传军那立艳唐东鑫
Owner DALIAN NATIONALITIES UNIVERSITY
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