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Yellow-green light strongly excitable molybdate red fluorescent material and preparation method thereof

A technology for red fluorescent and luminescent materials, applied in luminescent materials, chemical instruments and methods, sustainable architecture, etc., can solve the problems of chip wavelength drift and peak deviation, meet the requirements of light color quality, and is conducive to industrial production and preparation simple craftsmanship

Inactive Publication Date: 2011-05-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although blue light (467nm) contributes to white LEDs, we can judge that Eu 3+ The emission of activated molybdate red phosphor is mainly the result of excitation by 538nm yellow-green light

Method used

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  • Yellow-green light strongly excitable molybdate red fluorescent material and preparation method thereof
  • Yellow-green light strongly excitable molybdate red fluorescent material and preparation method thereof
  • Yellow-green light strongly excitable molybdate red fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Press LiY 0.5 Eu 0.5 (MoO 4 ) 2 Stoichiometric ratio weighed 1.1153gEu(NO 3 ) 3 ·6H 2 O, 0.9673gY (NO 3 ) 3 ·6H 2 O, dissolved in 15ml deionized water, then added 5.2799g citric acid as a chelating agent, 1.7767g (NH 4 ) 6 Mo 7 o 24 4H 2 O with 0.1904gLi 2 CO 3 Added to the solution, stirred to obtain a transparent solution. Heat the solution to 100°C under stirring, continue to stir and keep it warm for 1 hour to obtain a viscous object, keep it in a drying oven at 120°C for 24 hours to obtain a light yellow xerogel, grind it evenly in an agate mortar, and then transfer it to corundum The crucible was heated in a muffle furnace to 750°C for 6 hours, and after it was cooled to room temperature, it was taken out and then ground slightly to obtain a fine powder. X-ray diffraction analysis proves that the sample has a scheelite-type tetragonal crystal structure. The excitation and emission of the sample are shown in Figure 1. The main emission peak is loca...

Embodiment 2

[0029] Press NaY 0.5 Eu 0.5 (MoO 4 ) 2 Stoichiometric ratio weighed 0.2655g Na 2 CO 3 , 0.44g Eu 2 o 3 , 0.2823gY 2 o 3 , 1.4467 g MoO 3 Put it in an agate mortar and add absolute ethanol to grind for 0.5 hours, dry it at 70°C, transfer it into a corundum crucible, put it in a muffle furnace and heat it to 750°C for 6 hours. After the temperature dropped to room temperature, the sample was ground into powder in an agate mortar. The X-ray diffraction results of the obtained sample show that the powder has a scheelite-type tetragonal crystal structure, and the excitation spectrum emitted at 616nm is monitored, and the highest excitation intensity is located at around 538nm.

Embodiment 3

[0031] The sample powder gained in embodiment 1 is mixed with commercial YAG:Ce 3+ In a layered form, the commercial LED blue chip is covered and assembled into an LED device, wherein YAG:Ce 3+ The layer is next to the LED chip, and the sample powder layer is covered in YAG:Ce 3+ Above, the ratio of the thickness of the two layers is about 1:1. The spectrum diagram of the packaged LED device driven by a forward current of 0.02 ampere is shown in FIG. 2 . The peak emission at around 460nm in the spectrogram belongs to the chip emission, and the broad-spectrum emission with the main emission peak at 550nm belongs to YAG:Ce 3+ launch, but in YAG:Ce 3+ There is an obvious depression at about 538nm of the emission, and this peak position just corresponds to the strongest excitation peak at 538nm of the sample obtained in Example 1. In addition, there is an obvious emission peak at 616nm in the device spectrum. The changes in these two aspects It also just proves that YAG:Ce 3+...

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Abstract

The invention discloses a yellow-green light strongly excitable molybdate red fluorescent material and a preparation method thereof. The yellow-green light strongly excitable molybdate red fluorescent material has a scheelite type tetragonalcrystal structure, and the chemical formula of the material is AY0.5Eu0.5(MoO4)2, wherein A may be Li, Na or K. The light emitting material has the highest excitation strength when the wavelength is 530 to 545 nanometers, and the material belongs to a yellow-green light excitable red fluorescent material. The preparation method is a solid phase method or sol-gel method. The powdered molybdate red fluorescent material is mixed with yellow powder YAG:Ce<3+> or combined with the yellow powder YAG:Ce<3+> layer by layer, and the fluorescent powder layer and a blue light emitting diode (LED) are packaged by the conventional process to form a warm white LED element. The invention has the advantages that: the preparation process is simple and the technology is mature, so industrial production can be realized easily; and due to the addition of the molybdate red fluorescent material, the red component of the emission spectrum of the white LED element is compensated, the related color temperature is reduced to the lowest level, and the increasing requirements of people on light color quality of white light in solid lighting technology are met.

Description

【Technical field】 [0001] The invention relates to the technical field of optoelectronic materials and solid-state lighting, in particular to a molybdate red fluorescent material that can be strongly excited by yellow-green light and a preparation method thereof. 【Background technique】 [0002] For the current white light LED, the most mainstream implementation method is the combination of blue LED and yellow phosphor to emit white light. The white light produced by this method lacks red components, resulting in a higher correlated color temperature and a lower color rendering index. Some potential applications of this LED in real life are limited. When red components are added, the correlated color temperature and color rendering index of white LEDs can be significantly improved, so red phosphor plays a vital role in modulating white LEDs and improving their color rendering. However, there is still a lack of high-efficiency red phosphors that can be effectively excited by e...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/181Y02B20/00
Inventor 王达健郑玺毛智勇仇坤王鹏蔡毅徐所成陆启飞费沁妮田华于文惠吕天帅
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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