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a mn 2+ Activated niobium tantalate yellow luminescent phosphor and its preparation and application

A niobium tantalate and phosphor technology, applied in the field of niobium tantalate yellow light-emitting phosphors, can solve the problems of poor color rendering of white LED products, difficulty in meeting the needs of low color temperature lighting, and difficulty in obtaining white light LEDs, etc., to achieve excellent heat dissipation The effects of stability, short preparation cycle and high luminous intensity

Active Publication Date: 2022-03-22
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of phosphor is mainly YAG yttrium aluminum garnet, whose chemical formula is Y 3 Al 5 o 12 : Ce 3+ , but due to its luminescent center Ce 3+ There is a serious shortage of emission in the red light part, resulting in poor color rendering of white LED products, and it is difficult to meet the needs of low color temperature lighting. It is difficult to obtain white light LEDs with a low color temperature below 4000K using this phosphor

Method used

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  • a mn <sup>2+</sup> Activated niobium tantalate yellow luminescent phosphor and its preparation and application
  • a mn <sup>2+</sup> Activated niobium tantalate yellow luminescent phosphor and its preparation and application
  • a mn <sup>2+</sup> Activated niobium tantalate yellow luminescent phosphor and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: NaCa 0.85 mn 0.15 CaNbO 6 f

[0027] According to the chemical formula Ca 0.85 mn 0.15 CaNbO 6 The stoichiometric ratio of each element is weighed: CaCO 3 : 4.25 g; MnCO 3 : 0.862 grams; Ta 2 o 5 : 11.051 g; Nb 2 o 5 : 6.645 g; put the weighed raw materials into an agate mortar and grind them carefully to obtain a mixture of these raw materials that is pre-calcined in an air atmosphere at a calcination temperature of 900° C. for 9 hours; the obtained pre-calcined raw materials are placed again Grind in an agate mortar, press the obtained mixture into a block, and calcinate it twice in an air atmosphere at a temperature of 1400°C for 1 hour, cool naturally, put it into an agate mortar and grind it into a powder, and obtain a pre-calcined mixture.

[0028] According to NaCa 0.85 mn 0.15 CaNbO 6 The stoichiometric ratio of sodium in F weighs NaF: 2.1 grams, and weighs NH in an equimolar amount to NaF 4 F: 1.85 grams; the pre-calcined mixture and ...

Embodiment 2

[0033] Example 2: NaCa 0.999 mn 0.001 CaNbO 6 f

[0034] According to the chemical formula Ca 0.999 mn 0.001 CaNbO 6 The stoichiometric ratio of each element is weighed: Ca(NO 3 )2 : 14.74 g; MnCO 3 : 0.011 grams; Ta 2 o 5 : 19.89 g; Nb 2 o 5 : 11.96 grams; the weighed raw materials are put into an agate mortar, carefully ground, and the mixture of these raw materials obtained is pre-calcined in an air atmosphere, the calcination temperature is 1200 ℃, and the calcination time is 1 hour; the pre-calcined raw materials obtained are placed again Grinding in an agate mortar, the obtained mixture is pressed into a block, and calcined for the second time in an air atmosphere. The calcination temperature is 1200 ° C, and the calcination time is 10 hours. After natural cooling, it is put into an agate mortar and ground into a powder to obtain a pre-calcined mixture.

[0035] According to NaCa 0.999 mn 0.001 CaNbO 6 The stoichiometric ratio of sodium in F weighs NaF: 3....

Embodiment 3

[0037] Example 3: NaCa 0.8 mn 0.2 CaNbO 6 f

[0038] According to the chemical formula Ca 0.8 mn 0.2 CaNbO 6 The stoichiometric ratio of each element is weighed: CaCO 3 : 4.8 g; MnCO 3 : 1.380 grams; Ta 2 o 5 : 13.26 g; Nb 2 o 5 : 7.974 grams; put the weighed raw materials into an agate mortar and grind carefully to obtain a mixture of these raw materials which is pre-calcined in an air atmosphere at a calcination temperature of 850°C and a calcination time of 10 hours; the obtained pre-calcined raw materials are placed again Grinding in an agate mortar, pressing the obtained mixture into blocks, and calcining for the second time in an air atmosphere, the calcining temperature is 1300°C, and the calcining time is 4 hours. The product obtained in the above steps is naturally cooled to obtain a pre-calcined product.

[0039] According to NaCa 0.8 mn 0.2 CaNbO 6 The stoichiometric ratio of the sodium element in F Weigh NaF: 2.52 grams, and weigh NH in an equimolar a...

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Abstract

The invention discloses a Mn 2+ Activated niobium tantalate yellow luminescent phosphor and its preparation and application, the chemical formula of the phosphor is NaCa 1‑x mn x CaNbO 6 F, x is the divalent manganese ion Mn 2+ replace Ca 2+ The number of moles of , 0.001≤x≤0.2, the first is to use the solid-phase synthesis method to prepare the fluorine-free precursor Ca 1‑x mn x CaNbO 6 (0.001≤x≤0.2); then add sodium fluoride and ammonium fluoride to the precursor, mix thoroughly, press into a block, and then use solid-phase synthesis to sinter to obtain it. The phosphor powder provided by the present invention can well absorb near-ultraviolet light and emit yellow light with very pure chromaticity. Yellow glow powder.

Description

technical field [0001] The invention relates to the field of inorganic fluorescent materials, in particular to a Mn 2+ Activated niobium tantalate yellow luminescent phosphor and its preparation and application. Background technique [0002] In recent years, with the innovation and development of semiconductors, semiconductor-based LED lighting has received great attention. Ultraviolet and near-ultraviolet semiconductor chip-based lighting has formed today's mainstream commercial white LED lighting devices, which are different from traditional fluorescent lamps. Compared with energy-saving lighting and other light sources, the rapidly developing new generation of lighting based on LED chips has great advantages, such as long service life, LED lighting can work for more than 50,000 hours without failure, and the life span is hundreds of times that of incandescent lamps; power saving , The power consumption of LED is only 1 / 10 of incandescent lamp, and the voltage range is wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67H01L33/50
CPCC09K11/67H01L33/502
Inventor 乔学斌王胜家
Owner XUZHOU NORMAL UNIVERSITY