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Eu3+doped tantalite red fluorescent powder and preparing method and application

A red phosphor, tantalate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of lack of green and red components, poor color reproduction, low luminous efficiency, etc., to achieve pure chromaticity, The production conditions and equipment requirements are not high, and the effect of wide application prospects

Active Publication Date: 2017-03-29
NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used white light LED with mature technology is mainly based on GaN-based chips that emit blue light and YAG:Ce phosphor powder, which is realized by exciting YAG:Ce to emit yellow light and blue light, which has high efficiency and low manufacturing cost. Low, but due to the lack of green and red components in its emission spectrum, especially in the red region, the luminous efficiency is not high, resulting in a relatively low color rendering index, poor color reproduction, and cooler tones, which limits its application. In addition, the cost of its preparation process is also relatively high

Method used

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  • Eu3+doped tantalite red fluorescent powder and preparing method and application
  • Eu3+doped tantalite red fluorescent powder and preparing method and application
  • Eu3+doped tantalite red fluorescent powder and preparing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of La 1.998 Eu 0.002 Ta 12 o 33 , according to the chemical formula La 1.998 Eu 0.002 Ta 12 o 33 The stoichiometric ratio of each element in , respectively weigh lanthanum oxide La 2 o 3 : 0.977 g, europium oxide Eu 2 o 3 : 0.003 g, tantalum oxide Ta 2 o 5 : 8.034 g. After grinding and mixing uniformly in an agate mortar, select the air atmosphere for pre-calcination, the pre-calcination temperature is 550 ° C, and the pre-calcination time is 18 hours, then cool to room temperature, take out the sample, fully mix and grind the obtained precursor, The final calcination was carried out in 1000° C., the calcination time was 5 hours, cooled to room temperature, and the required fluorescent material was obtained by taking out the sample and grinding it.

[0029] See attached figure 1 , which is the X-ray powder diffraction pattern of the sample prepared by the technical scheme of this embodiment, the XRD test results show that the prepared tantalate...

Embodiment 2

[0035] Preparation of La 1.98 Eu 0.02 Ta 12 o 33 , according to the chemical formula La 1.98 Eu 0.02 Ta 12 o 33 The stoichiometric ratio of each element in, respectively weighed lanthanum carbonate La 2 (CO 3 ) 3 ·8H 2 O: 1.788 g, europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 0.027 g, tantalum oxide Ta 2 o 5 : 8.034 g. After grinding and mixing uniformly in an agate mortar, choose air atmosphere for pre-calcination, the pre-calcination temperature is 650 ° C, and the pre-calcination time is 10 hours, then cool to room temperature, take out the sample, fully mix and grind the obtained precursor, and Carry out calcination at 1100°C in air, the calcination time is 8 hours, cool to room temperature, take out the sample and grind to obtain the required tantalate fluorescent material.

[0036] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence decay curve.

Embodiment 3

[0038] Preparation of La 1.92 Eu 0.08 Ta 12 o 33 , according to the chemical formula La 1.92 Eu 0.08 Ta 12 o 33 The stoichiometric ratio of each element in , weigh lanthanum nitrate La(NO 3 ) 3 : 1.872 g, europium sulfate Eu 2 (SO 4 ) 3 ·H 2 O: 0.073 g, tantalum oxide Ta 2 o 5 : 8.034 g. After grinding and mixing uniformly in an agate mortar, choose air atmosphere for pre-calcination, the pre-calcination temperature is 900 ° C, and the pre-calcination time is 1 hour, then cool to room temperature, take out the sample, and fully mix and grind the obtained precursor. In the air, calcining is carried out at 1300° C. for 4 hours, cooled to room temperature, and the sample is taken out and ground to obtain the required tantalate fluorescent material.

[0039] The sample prepared in this example is similar to Example 1 in its main structural appearance, excitation spectrum, emission spectrum and luminescence decay curve.

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Abstract

The invention discloses a Eu3+doped tantalite red fluorescent powder and a preparing method and application therefore. The fluorescent powder is La2-2xEu2xTa12O33, wherein x is the Eu3+doped chemical metering score and is larger than or equal to 0.001 and smaller than or equal to 0.20, the high-temperature solid phase method is adopted, rare earth ions are added, and the Eu3+doped tantalite red fluorescent powder is prepared. The Eu3+doped tantalite red fluorescent powder can be effectively excited by near ultraviolet light and blue light nearby 250 nanometers to 475 nanometers, the emission wavelength of the Eu3+doped tantalite red fluorescent powder and the emission wavelength of a near-ultraviolet LED chip are quite coincident, and under excitation of the near ultraviolet light, the fluorescent powder can emit bright red fluorescence, the emission wavelength is mainly 612 nanometers, and the red fluorescence has the quite-wide excitation spectrum and the quite-wide luminescence spectrum; the obtained granularity is even, the luminous efficiency is high, the chemical stability is good, toxic gas such as sulfide cannot be generated under ultraviolet radiation, the environment is friendly, and the Eu3+doped tantalite red fluorescent powder can be applied to white light LED and the other luminous fields; in the preparing process, compounds with elements required by synthetic materials are mixed in proportion, the high-temperature solid phase method is adopted, the technology is simple, the Eu3+doped tantalite red fluorescent powder is free of pollution, environmentally friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a Eu 3+ The doped tantalate red fluorescent powder, its preparation method and application belong to the technical field of luminescent materials. Background technique [0002] White light LED is the fourth-generation lighting electric light source after incandescent lamps, fluorescent lamps and energy-saving lamps, or called the green light source in the 21st century. Lightweight, fast response, low working voltage and good safety. Since Nichia first developed white LEDs in 1996, replacing traditional lighting sources with LED solid-state light sources is the main trend in the development of lighting technology. All countries have attached great importance to it, formulated development plans one after another, and stepped up research and development. [0003] At present, the most widely used white light LED with mature technology is mainly based on GaN-based chips that emit blue light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7787H01L33/502H01L2933/0041Y02B20/00
Inventor 聂新明乔学斌
Owner NANJING TONGLI CRYSTAL MATERIALS RES INST CO LTD
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