Preparation of luminescent material

A fluorescent material, gadolinium oxide technology, applied in the direction of luminescent materials, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of easy oxidation of compounds, high melting point of phosphor powder, inability to melt, etc., to achieve luminous brightness and performance improvement, High luminous efficiency and easy industrial operation

Inactive Publication Date: 2009-07-08
KUNMING UNIV OF SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the high melting point of the prepared phosphor, it cannot be melted, and at high temperature, Tb 3+ Compounds are easily oxidized

Method used

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  • Preparation of luminescent material
  • Preparation of luminescent material

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Experimental program
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Embodiment approach 1

[0023] Embodiment 1: Weighing Gd 2 o 3 has a mass of 17 g, Tb 4 o 7 The quality of 0.15 gram, measure the volume of the nitric acid of 65% that the mass percent concentration is 23mL, and add the water of 20mL simultaneously to above-mentioned Gd 2 o 3 with Tb 4 o 7 In the mixture, continuously stir and heat until the temperature is about 90° C., and configure ammonia water with a concentration of 15 wt%, and adjust the pH value to about 1.5. The quality of taking the oxalic acid crystal is 37.5 grams, add 150mL of water to dissolve, then add oxalic acid to neutralize the nitrate generated by the above steps, carry out coprecipitation reaction, the reaction time is 0.5 hour, obtain the coprecipitate of rare earth oxalate, static Leave for 2.5 hours. Pour out the supernatant and filter with suction, dry it at 100°C for 1 hour, take it out, heat and decompose it at 900°C to obtain the precursor, and keep it for 2 hours. Take out the brown precursor, weigh 17 grams of the...

Embodiment approach 2

[0024] Embodiment 2: Weighing Gd 2 o 3 has a mass of 20 grams, Tb 4 o 7 The mass is 0.25 grams, and the volume of concentrated nitric acid with a mass percentage concentration of 65% is 24mL, and the water of 20mL is added to the above-mentioned Gd at the same time 2 o 3 with Tb 4 o 7 In the mixture, continuously stir and heat until the temperature is about 100° C., and prepare ammonia water with a concentration of 15 wt%, and adjust the pH value to about 2.0. The quality of taking the oxalic acid crystal is 33.4 grams, add 120mL of water to dissolve, then add oxalic acid to neutralize the nitrate generated in the above steps, carry out coprecipitation reaction, the reaction time is 1 hour, obtain the coprecipitate of rare earth oxalate, static Leave for 3 hours. Pour out the supernatant and filter it with suction, dry it at 100°C for 2 hours, take it out, heat and decompose it at 1000°C to obtain the precursor, hold it for 1 hour to obtain the precursor, weigh 20 grams, ...

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Abstract

The invention discloses a method for preparing a fluorescent material, namely a method for synthesizing Gd2O2S: Tb fluorescent powder and a flux composition used by the method. A co-precipitation method is adopted to prepare a precursor, and then the Gd2O2S: Tb fluorescent powder is prepared through a high-temperature solid-phase reaction. A flux growth method used by the method can reduce the growth temperature of crystals, and is easy for industrialized operation; the selected flux composition can remarkably improve the crystal shape and particle size distribution of the fluorescent powder; the obtained crystals have integral structures and less defects; and the method reduces the synthesis temperature of the high-temperature solid-phase reaction of the Gd2O2S: Tb fluorescent powder, improves crystal structures and the particle size distribution of the fluorescent powder, and ensures that the luminous brightness and service performance of the fluorescent powder are further improved.

Description

1. Technical field [0001] The invention relates to a preparation method of fluorescent material. It belongs to the technical field of luminescent material preparation. 2. Background technology [0002] Terbium-activated gadolinium oxysulfide (Gd 2 o 2 S:Tb) as a high-performance green phosphor plays an important role in the fields of cathode ray luminescence and X-ray luminescence. Terbium-activated gadolinium oxysulfide phosphors exhibit a bright green color under ultraviolet, cathode ray, or X-ray excitation. Because of its superior luminescence properties, Gd 2 o 2 S:Tb phosphors are especially used in medical diagnosis or cathode ray fluorescent screens of displays. In U.S. Patent (Patent No.: 3428246) M.R.Royce etc. since the 1960s, to Gd 2 o 2 S:Tb phosphors have been extensively and intensively studied. [0003] In the article "Preparation Technology of Rare Earth Sulfur Oxide Luminescent Materials", Huang Qiuping, Hong Zhanglian, etc. introduced the common m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C09K11/84
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秦博郁青春姚耀春李永梅
Owner KUNMING UNIV OF SCI & TECH
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