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a ho 3+ Activated green down-conversion phosphor and preparation method thereof

A fluorescent powder and green technology, applied in the field of green down-conversion phosphor and its preparation, can solve the problems of reduction, inability to emit green light, complex synthesis conditions of phosphor, etc., and achieve high quantum efficiency and high luminous intensity

Active Publication Date: 2022-03-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to Tb 3+ The synthesis conditions of doped phosphors are more complicated. For example, when terbium oxide is used as raw material, it involves the control of reduction conditions, and part of the matrix is ​​doped with Tb 3+ Can't get it back and can't emit green light
In addition, Tb 3+ The price of ionic raw materials is high, for example, the price of terbium oxide is about 3.6 times that of holmium oxide

Method used

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  • a ho <sup>3+</sup> Activated green down-conversion phosphor and preparation method thereof
  • a ho <sup>3+</sup> Activated green down-conversion phosphor and preparation method thereof
  • a ho <sup>3+</sup> Activated green down-conversion phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw materials were weighed according to the element molar ratio Ho:La:Ta:Ga=0.045:2.955:0.5:5.5, and the said raw materials were respectively holmium oxide, lanthanum oxide, tantalum oxide, and gallium oxide. Add the raw materials into an agate mortar, grind them evenly, and transfer them into a corundum crucible, then place the corundum crucible in a high-temperature furnace, and perform the first step of pre-firing at 400°C with a heating rate of 10°C / min and a holding time of 4h. After natural cooling to room temperature, take it out for grinding, and then carry out the second step of sintering at 1400°C, the heating rate is 5°C / min, and the holding time is 4h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product.

Embodiment 2

[0030] The raw materials were weighed according to the element molar ratio Ho:La:Ta:Ga=0.03:2.97:0.5:5.5, and the said raw materials were respectively holmium oxide, lanthanum oxide, tantalum oxide, and gallium oxide. Add the raw materials into an agate mortar, grind them evenly, and transfer them into a corundum crucible, then place the corundum crucible in a high-temperature furnace, and perform the first step of pre-firing at 300°C, with a heating rate of 5°C / min and a holding time of 3h. After natural cooling to room temperature, take it out for grinding, and then carry out the second step of sintering at 1000°C, the heating rate is 10°C / min, and the holding time is 6h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product.

Embodiment 3

[0032] The raw materials were weighed according to the element molar ratio Ho:La:Ta:Ga=0.15:2.85:0.5:5.5, and the said raw materials were respectively holmium oxide, lanthanum oxide, tantalum oxide and gallium oxide. Add the raw materials into an agate mortar, grind them evenly, and transfer them into a corundum crucible, then place the corundum crucible in a high-temperature furnace, and perform the first step of pre-firing at 600°C with a heating rate of 10°C / min and a holding time of 2h. After natural cooling to room temperature, take it out for grinding, and then carry out the second step of sintering at 1400°C, the heating rate is 10°C / min, and the holding time is 6h. After the end, wait for it to cool down to room temperature naturally, and grind it evenly to get the product.

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Abstract

The invention discloses a Ho 3+ Activated green down-conversion phosphor and preparation method thereof, the molecular formula of the green down-conversion phosphor is Ho (3‑x‑y) La x R y Ta 0.5 Ga 5.5 O 14 , where 0

Description

technical field [0001] The present invention relates to the technical field of inorganic luminescent materials, more specifically, to a Ho 3+ Activated green down conversion phosphor and preparation method thereof. Background technique [0002] Trivalent holmium ion (Ho 3+ ) has abundant energy levels, so it has a variety of different emission wavelengths. Studies have shown that Ho 3 + It is an important up-conversion luminescent activator, and its metastable energy level 5 I 6 electrons can be effectively excited by light with a wavelength of 980 nm to obtain green light with a shorter wavelength near 535-545 nm ( 5 f 4 , 5 S 2 - 5 I 8 ) and red light near 640-660nm ( 5 f 5 - 5 I 8 ). Thanks to Ho 3+ Ions have prominent visible and mid-infrared light emission and are therefore suitable REEs for diverse photonics applications such as light-emitting diodes and optical thermometry. [0003] Although Ho 3+ Ion-activated phosphors have been reported, but the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G35/00C09K11/77
CPCC01G35/006C09K11/7769F21V9/30C01P2006/60C01P2002/72C01P2006/65
Inventor 石建新杨楠李俊豪张子旺邹丽媛
Owner SUN YAT SEN UNIV
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