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Dy<3+> doped Na5Y(MoO4)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, and long sintering time to reduce air pollutants generation, avoiding the influence of luminous performance, and improving the effect of luminous performance

Active Publication Date: 2021-04-13
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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  • Dy&lt;3+&gt; doped Na5Y(MoO4)4 warm white fluorescent powder and preparation method thereof
  • Dy&lt;3+&gt; doped Na5Y(MoO4)4 warm white fluorescent powder and preparation method thereof
  • Dy&lt;3+&gt; doped Na5Y(MoO4)4 warm white fluorescent powder and preparation method thereof

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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 stir at room temperature on a magnetic stirrer 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 1h, and after the water in the solution disappears, a light yellow sol-like precursor will be obtained; place the precursor in a muffle furnace, heat up to 650°C and calcinate for 1h to obtain Na 5 Y 1-x (MoO 4 ) 4 :xDy 3+ Phosphor.

[0041] Table 1

[0042]

Embodiment 2

[0044] On the basis of Example 1, change (NH 4 ) 6 Mo 7 o 24 4H 2O, (NH 4 ) 10 (H 2 W 12 o 42 )·xH 2 The amount of O used to get 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 change of the corresponding amount of O is 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 diagram and SEM diagram, such as figure 1 and figure 2 shown. Depend on figure 1 Available: Na 5 Y 1-x (MoO 4 ) 4-y (WO 4 ) y :xDy 3+ The XRD results of the standard Na 5 Y(MoO 4 ) 4 The diffraction peaks were consistent, the sample w...

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Abstract

The invention relates to Dy<3+> doped Na5Y(MoO4)4 warm white fluorescent powder and a preparation method thereof, and belongs to the technical field of luminescent materials. The chemical formula of the fluorescent powder is Na5Y1-x(MoO4)4-y(WO4)y:xDy<3+>, wherein x is greater than or equal to 0.01 and less than or equal to 0.07, and y is greater than or equal to 0.04 and less than or equal to 0.20. Na5Y(MoO4)4 is used as a matrix, Dy<3+> is used as a light-emitting center, yellow light and blue light emitted by Dy<3+> ions are combined into white light, and the light-emitting performance of the fluorescent powder is obviously enhanced after anion structure replacement; a sample is synthesized by adopting a citric acid sol combustion method and a soft chemical method, so that the influence of multiple high-temperature calcinations of a high-temperature solid-phase method on the luminescent property of the fluorescent powder is avoided, and the defects that particles obtained by a coprecipitation method are easy to agglomerate, irregular in morphology and the like are also avoided; and the method has the advantages of simple process, low synthesis temperature, smaller generated particles, high luminescent intensity, and being environment-friendly, economical and efficient.

Description

technical field [0001] The present invention relates to a Dy 3+ Doped with Na 5 Y(MoO 4 ) 4 Warm white fluorescent powder and a preparation method thereof belong to the technical field of luminescent materials. Background technique [0002] As a new generation of lighting source, white LED has a very broad application prospect, and has 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 made by coating a yellow YAG:Ce phosphor on a blue InGaN chip. However, the lack of red emission results in low color rendering index (CRI) and high color temperature (CCT), which greatly hinders the application of white LEDs. Another way to make white LEDs is to use near...

Claims

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Application Information

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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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