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Green phosphor and preparation thereof

A green phosphor, total mass technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of high synthesis temperature, and achieve the effect of high luminous efficiency and stable performance

Inactive Publication Date: 2009-07-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high-temperature solid-state reaction synthesis method is generally used, but the synthesis temperature is relatively high, generally above 1150 ° C to obtain a satisfactory hexagonal crystal form

Method used

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  • Green phosphor and preparation thereof
  • Green phosphor and preparation thereof
  • Green phosphor and preparation thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh gadolinium oxide (Gd 2 o 3 ) has a mass of 17.4782 grams, tetraterbium heptoxide (Tb 4 o 7 ) has a mass of 0.4947 grams, dysprosium oxide (Dy 2 o 3 ) is 0.0175 grams, sulfur is 4.4932 grams, zinc oxide is 0.2622 grams, sodium carbonate is 11.1661 grams, potassium carbonate is 5.5831 grams, lithium phosphate is 0.9305 grams, lithium carbonate is 0.9305 grams. Grind and mix the above substances thoroughly and then press into tablets. The thickness of the pressed tablets is about 1-2cm; put them into a covered corundum crucible and sinter in a vacuum furnace. When the temperature is raised to 725°C, start heat preservation and sintering for 2.5 hours; when the temperature cools to room temperature, take out the sintered block, smash it, add water to dissolve it, and heat it on an electric furnace. , after washing twice with water, pickling with hydrochloric acid with a concentration of 10-15wt%, then washing with water until neutral, removing residual soluble su...

Embodiment 2

[0021] Weigh gadolinium oxide (Gd 2 o 3 ) has a mass of 17.4782 grams, tetraterbium heptoxide (Tb 4 o 7 ) has a mass of 0.5708 grams, dysprosium oxide (Dy 2 o 3 ) is 1.75 grams, sulfur is 12.3137 grams, zinc oxide is 0.1748 grams, sodium carbonate is 11.8794 grams, potassium carbonate is 5.9397 grams, lithium phosphate is 0.99 grams, and lithium carbonate is 0.99 grams. Grind and mix the above-mentioned substances well and then press them into tablets, put them into a vacuum furnace for sintering, and start to heat up when the vacuum degree is lower than 10Pa, and keep warm for 1.5 hours until the sintering temperature is 525°C; when the temperature is cooled to room temperature Take out the sintered block, crush it, add water to dissolve it, and heat it on a universal electric stove. After it is completely dissolved, put it on a magnetic stirrer to stir, filter it with suction, wash it with water twice, and then pickle it with hydrochloric acid with a concentration of 10-...

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Abstract

The invention relates to green phosphor powder and a preparation method thereof; the chemical characteristic expression of the green phosphor powder is Gd(1-x-y)2O2S:Tbx, Dyy, wherein, Gd2O2S is the matrix and Tb and Dy are the activator. The phosphor powder is prepared by adding sulfur, dopant and fusing agent in a vacuum sintering way. The phosphor powder is synthesized directly in a vacuum low-temperature sintering way without reducing atmosphere; the sintering temperature is 500 to 1000 DEG C; and the sintering time is 1.5 to 4.5 hours. Phosphor powder with better performance can be prepared under lower temperature and shorter heat preserving time; and the prepared powder has smaller granularity and reveals better luminous performance. The phosphor powder can emit green fluorescence under the excitation of ultraviolet ray and X-ray; when the excitation wavelength is 254nm, the main emission wavelength is 545nm; the granularity of the prepared powder can reach tens of nanometers; simultaneously, the green fluorescence is emitted; and the prepared powder has high luminous efficiency and stable property.

Description

1. Technical field: [0001] The invention relates to a green fluorescent powder and a preparation method thereof. It belongs to the technical field of luminescent material preparation. 2. Background technology: [0002] Gd 2 o 2 As a high-performance green phosphor, S:Tb plays an important role in the fields of cathode ray luminescence and X-ray luminescence. Morlotti R, Nikl M, Piazza M, Boragno C. et al. in Instrinsic conversionefficiency of X-rays to light in Gd 2 o 2 S:Tb 3+ Powder phosphors pointed out that Gd 2 o 2 S:Tb 3+ As a very commonly used phosphor material activated by rare earth elements, it has good absorption and high emission efficiency for X-rays, short afterglow time and high chemical stability. Gd is also mentioned in the Chinese patent "a fluorescent powder emitting green fluorescence and its preparation method" (CN 1640984A) 2 o 2 S:Tb can be used in high-sensitivity green light intensifying screens excited by X-rays. Compared with phosphors...

Claims

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Application Information

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IPC IPC(8): C09K11/84
Inventor 王飞杨斌马文会刘大春戴永年谢克强伍继君刘永成周晓奎汪镜福徐宝强郁青春李永梅易惠华秦博曲涛邓勇熊恒
Owner KUNMING UNIV OF SCI & TECH