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a tb 3+ Activated niobium tantalate green luminescent phosphor and its preparation and application

A technology of niobium tantalate and phosphor, which is applied in the field of niobium tantalate green luminescent phosphor, can solve the problems of limitation, insufficient red light emission, poor color temperature and color rendering index, and achieve short preparation cycle and good color rendering , the effect of chemical stability

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

[0003] Today's most important lighting is made of blue semiconductor chips and yellow Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) Phosphor powder combination package, this kind of lighting has many advantages, but this kind of lighting has inevitable disadvantages: insufficient red light emission in lighting luminescence, poor color temperature (>4500K) and color rendering index (<80), These disadvantages largely limit some of its applications in general lighting
But the green light-emitting phosphor based on niobium tantalate has not been reported yet.

Method used

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  • a tb <sup>3+</sup> Activated niobium tantalate green luminescent phosphor and its preparation and application
  • a tb <sup>3+</sup> Activated niobium tantalate green luminescent phosphor and its preparation and application
  • a tb <sup>3+</sup> Activated niobium tantalate green luminescent phosphor and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: NaCa 0.7 Tb 0.15 Li 0.15 CaNbO 6 f

[0029] According to the chemical formula Ca 0.7 Tb 0.15 Li 0.15 CaNbO 6 The stoichiometric ratio of each element is weighed: CaCO 3 : 3.5 g; Tb 2 o 3 : 1.37 grams; Ta 2 o 5 : 11.051 g; Li 2 CO 3 : 0.277 g; Nb 2 o 5 : 6.645 grams; the weighed raw materials were put into an agate mortar and ground carefully to obtain a mixture of these raw materials which was pre-calcined in an air atmosphere at a calcination temperature of 900°C and a calcination time of 9 hours; the obtained pre-calcined raw materials were 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.

[0030] According to NaCa 0.7 Tb 0.15 Li 0.15 CaNbO 6 The stoichiometric ratio of sodium in F weighs NaF: 2.1 grams, and weighs NH i...

Embodiment 2

[0035] Example 2: NaCa 0.998 Tb 0.001 Li 0.001 CaNbO 6 f

[0036] According to the chemical formula Ca 0.998 Tb 0.001 Li 0.001 CaNbO 6 The stoichiometric ratio of each element in is weighed: Ca(NO 3 ) 2 : 14.73 g; Tb 2 o 3 : 0.017 grams; Ta 2 o 5 : 19.89 g; Li 2 CO 3 : 0.0004 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, the calcination time is 10 hours, cooled naturally, put into an agate mortar and ground into a powder, and the pre-calcined mixture.

[0037] According to NaCa 0.998 Tb 0.001 Li 0.001 CaNbO 6 The stoich...

Embodiment 3

[0039] Example 3: NaCa 0.6 Tb 0.2 Li 0.2 CaNbO 6 f

[0040] According to the chemical formula Ca 0.6 Tb 0.2 Li 0.2 CaNbO 6 The stoichiometric ratio of each element is weighed: CaCO 3 : 3.6 g; Tb 2 o 3 : 2.196 grams; Ta 2 o 5 : 13.26 g; Li 2 CO 3 : 0.443 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 a block, 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.

[0041] According to NaCa 0.6 Tb 0.2 Li 0.2 CaNbO 6 The stoichiometric ratio of the sodium element in F We...

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Abstract

The invention discloses a Tb 3+ Activated niobium tantalate green luminescent phosphor and its preparation and application, the chemical formula of the phosphor is NaCa 1‑2x Tb x Li x CaNbO 6 F, x is Tb 3+ ions and Li + ions respectively 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‑ 2x Tb x Li x CaNbO 6 (0.001≤x≤0.2); then add sodium fluoride and ammonium fluoride to the precursor, mix well, press into a block, and then use solid phase synthesis to sinter to obtain it. The phosphor powder provided by the invention can well absorb near-ultraviolet light and emit green light with very pure chromaticity. The phosphor powder can be well matched with near-ultraviolet semiconductor LED chips, and is a potential method for preparing white light LED lighting devices. Green glow powder.

Description

technical field [0001] The invention relates to the field of inorganic fluorescent materials, in particular to a Tb 3+ Activated niobium tantalate green 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 wid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67H01L33/50
CPCC09K11/7748H01L33/502
Inventor 乔学斌王胜家
Owner XUZHOU NORMAL UNIVERSITY