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a dy 3+ doped na 5 y(moo 4 ) 4 Warm white fluorescent powder and preparation method thereof

A fluorescent powder and warm white light technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve problems such as agglomeration or insufficiently uniform composition, uneven distribution, high synthesis temperature, etc., and achieve the goal of reducing air pollutants Produce, avoid the influence of luminous performance, reduce the effect of synthesis temperature

Active Publication Date: 2022-07-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from these reports that the synthesis temperature required by the high-temperature solid-phase method is high, the sintering time is long, and the particle size obtained is large and unevenly distributed, resulting in low luminous efficiency; The local concentration will be too high, resulting in agglomeration or uneven composition, which will affect the luminescent performance, and it is easy to introduce impurities during the preparation process

Method used

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  • a dy <sup>3+</sup> doped na <sub>5</sub> y(moo <sub>4</sub> ) <sub>4</sub> Warm white fluorescent powder and preparation method thereof
  • a dy <sup>3+</sup> doped na <sub>5</sub> y(moo <sub>4</sub> ) <sub>4</sub> Warm white fluorescent powder and preparation method thereof
  • a dy <sup>3+</sup> doped na <sub>5</sub> y(moo <sub>4</sub> ) <sub>4</sub> Warm white fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh each raw material as shown in Table 1 and put it into a 100ml beaker, add deionized water and place it on a magnetic stirrer and stir at room temperature until the solution is clear and ready for use; weigh 2.8019g of citric acid and add it to the prepared appeal solution, Put it on a magnetic stirrer, heat and stir at 80 °C for 1 h, and when the water in the solution disappears, a pale yellow sol-like precursor will be obtained; the precursor is placed in a muffle furnace, heated to 650 ° C and calcined for 1 h to obtain Na 5 Y 1-x (MoO 4 ) 4 :xDy 3+ phosphor.

[0041] Table 1

[0042] Na 5 Y 1-x (MoO 4 ) 4 :xDy 3+

Embodiment 2

[0044] On the basis of Example 1, change (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, (NH 4 )10 (H 2 W 12 O 42 ) xH 2 Dosage of O to obtain Na 5 Y(MoO 4 ) 4-y (WO 4 ) y :0.04Dy 3+ phosphor. (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and (NH 4 ) 10 (H 2 W 12 O 42 ) xH 2 The changes in the corresponding amounts of O are shown in Table 2.

[0045] Table 2

[0046] Na 5 Y(MoO 4 ) 4-y (WO 4 ) y :0.04Dy 3+

y＝0.04 y＝0.08 y＝0.12 y＝0.16 y＝0.20 (NH 4 ) 6 Mo 7 O 24 ·4H 2 O(g)

2.0974 2.0763 2.0551 2.0339 2.0127 (NH 4 ) 10 (H 2 W 12 O 42 ) xH 2 O(g)

0.0306 0.0612 0.0918 0.1224 0.153

[0047] analyze:

[0048] 1. Test Na 5 Y 1-x (MoO 4 ) 4-y (WO 4 ) y :xDy 3+ XRD patterns and SEM pictures, such as figure 1 and figure 2 shown. It can be obtained from Figure 1: Na 5 Y 1-x (MoO 4 ) 4-y (WO 4 ) y :xDy 3+ XRD results of standard Na 5 Y(MoO 4 ) 4 The diffraction peaks are consistent, the sample purity...

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Abstract

The present invention relates to a Dy 3+ Doping with Na 5 Y(MoO 4 ) 4 The invention relates to a warm white fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. The chemical formula of phosphor powder is: Na 5 Y 1‑x (MoO 4 ) 4‑y (WO 4 ) y :xDy 3+ ; Among them, 0.01≤x≤0.07, 0.04≤y≤0.20. Using Na 5 Y(MoO 4 ) 4 as the matrix, with Dy 3+ For the luminous center, through Dy 3+ The yellow light and blue light emitted by ions are combined with white light, and the luminescent properties of the phosphors are significantly enhanced after the anion structure is replaced; the samples are synthesized by the soft chemical method of the citric acid sol combustion method, which avoids the multiple high-temperature calcination of the high-temperature solid-phase method. It also avoids the defects of easy agglomeration and irregular morphology of the particles obtained by the co-precipitation method.

Description

technical field [0001] The present invention relates to a Dy 3+ Doping with Na 5 Y(MoO 4 ) 4 A warm white light phosphor and a preparation method thereof belong to the technical field of luminescent materials. Background technique [0002] As a new generation of lighting sources, white LEDs have very broad application prospects and have been widely used in signal lights, display screens, LCD backlights and other fields. Compared with traditional lighting sources such as incandescent lamps and fluorescent lamps, white LEDs have obvious advantages such as high luminous efficiency, energy saving and environmental protection, long service life, and good color rendering. Currently, commercial white LEDs are fabricated by coating yellow YAG:Ce phosphors on blue InGaN chips. However, the lack of red light emission, resulting in low color rendering index (CRI) and high color temperature (CCT), greatly hinders the application of white LEDs. Another approach to making white LEDs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7776H01L33/502Y02B20/00
Inventor 张文涛肖江国陈显飞张佩聪黄雪王晓萌张继勇王益群
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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