Preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to 3D PDP

A technology of red phosphor and yttrium gadolinium europium is applied in the field of preparation of yttrium gadolinium europium oxide red phosphor for 3D PDP, which can solve the problems of poor vacuum ultraviolet maintenance rate and poor luminescence characteristics, and achieves reduced hydrolysis, small central particle size, The effect of enhancing the brightness maintenance ratio

Inactive Publication Date: 2012-11-07
CAIHONG GRP ELECTRONICS CO LTD
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Problems solved by technology

Due to the inconsistent excitation conditions of the two, their corresponding luminescence mechanisms are different, and the requirements for phosphors, especially the surface characteristics of phosphors, are different (under the condition of 253.7nm ultraviolet excitation, yttrium oxide gadolinium europium belongs to the active center and directly absorbs ultraviolet light, and belongs to the body. Luminescence, not high requirements on the surface; under the condition of 147nm vacuum excitation, yttrium gadolinium europium oxide belongs to the matrix lattice absorbs vacuum ultraviolet rays and then transmits to the luminescent center, which belongs to the surface layer luminescence), therefore, the yttrium europium oxide obtained by traditional technology has the luminescent characteristics Poor, poor vacuum ultraviolet maintenance rate, etc., cannot fully meet the requirements of 3D PDP

Method used

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  • Preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to 3D PDP

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Embodiment 1

[0026] A kind of preparation method of yttrium oxide gadolinium europium red fluorescent powder for 3D PDP, comprises the following steps:

[0027] The first step, according to the chemical formula (Y 1-x-y Gd y , Eu x ) 2 o 3 For batching, in the chemical formula x=0.06, y=0.27, weigh yttrium oxide, gadolinium oxide and europium oxide respectively, dissolve them in nitric acid with a concentration of 10mol / L, and dilute to 4L to form a rare earth metal salt solution with a concentration of 0.5mol / L ;

[0028] Prepare 4L of oxalic acid solution, the concentration is 0.8mol / L, the pH value of the solution is between 3.0-3.5, heat the rare earth metal salt solution to 80°C while stirring, and add the oxalic acid solution to the rare earth metal salt solution to obtain rare earth metal oxalic acid Salt or carbonate precipitate, the precipitate is fully washed with hot deionized water to pH = 6-7, then the precipitate is filtered and separated, dried at 120°C for 16 hours, an...

Embodiment 2

[0034] A kind of preparation method of yttrium oxide gadolinium europium red fluorescent powder for 3D PDP, comprises the following steps:

[0035] The first step, according to the chemical formula (Y 1-x-y Gd y , Eu x ) 2 o 3For batching, in the chemical formula x=0.06, y=0.27, weigh yttrium oxide, gadolinium oxide and europium oxide respectively, dissolve them in nitric acid with a concentration of 10mol / L, and dilute to 4L to form a rare earth metal salt solution with a concentration of 0.5mol / L ;

[0036] Prepare 4L of oxalic acid solution, the concentration is 0.8mol / L, the pH value of the solution is between 3.0-3.5, heat the rare earth metal salt solution to 80°C while stirring, and add the oxalic acid solution to the rare earth metal salt solution to obtain rare earth metal oxalic acid Salt or carbonate precipitate, the precipitate is fully washed with hot deionized water to pH = 6-7, then the precipitate is filtered and separated, dried at 120°C for 16 hours, and...

Embodiment 3

[0042] A kind of preparation method of yttrium oxide gadolinium europium red fluorescent powder for 3D PDP, comprises the following steps:

[0043] The first step, according to the chemical formula (Y 1-x-y Gd y , Eu x ) 2 o 3 For batching, in the chemical formula x=0.06, y=0.27, weigh yttrium oxide, gadolinium oxide and europium oxide respectively, dissolve them in 10mol / L nitric acid, dilute to 4L to form a rare earth metal salt solution with a concentration of 0.5mol / L ;

[0044] Prepare 4L of oxalic acid solution, the concentration is 0.8mol / L, the pH value of the solution is between 3.0-3.5, heat the rare earth metal salt solution to 80°C while stirring, and add the oxalic acid solution to the rare earth metal salt solution to obtain rare earth metal oxalic acid Salt or carbonate precipitate, the precipitate is fully washed with hot deionized water to pH = 6-7, then the precipitate is filtered and separated, dried at 120°C for 16 hours, and roasted at 1000°C for 5 ho...

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Abstract

A preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to a 3D PDP (Plasma Display Panel) comprises the steps as follows: a rare earth oxalate coprecipitation body is prepared by adopting a coprecipitation method, rare earth metal oxide is balanced and dissolved in nitric acid or chlorhydric acid to form a rare earth metal salt solution; an oxalic acid solution or a carbonate solution is prepared and added into the rare earth metal salt solution to obtain rare earth metal oxalate or a carbonate precipitate; the carbonate precipitate is filtered and isolated, dried and burned to obtain a rare earth oxide coprecipitation body; the coprecipitation body is oxidized and burned to form a yttrium gadolinium europium oxide red fluorescent powder burned body; the rare earth oxide coprecipitation body is added with a cosolvent and is loaded in an aluminum oxide crucible and is burned under high temperature in an oxidizing furnace; after burned, the rare earth oxide coprecipitation body is shattered after burning to obtain a yttrium gadolinium europium finished product; and finally, the yttrium gadolinium europium oxide red fluorescent powder is obtained according to a downstream treatment process. The fluorescent powder prepared according to the method has the advantages of high lighting brightness, good color purity, complete crystal morphology, small powder center particle size, simple manufacturing method and low production cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of phosphors for display devices, in particular to a preparation method of yttrium oxide gadolinium europium red phosphor powder for 3D PDP. Background technique [0002] At present, the red powder widely used in PDP display devices is borate red powder, and its chemical composition formula is (Y,Gd)BO 3 :Eu, and with BaMgAl 10 o 17 :Eu blue powder and Zn 2 SiO 4 : Combined use of Mn green powder. (Y,Gd)BO 3 :Eu is used as a red phosphor in a PDP because of its high brightness. [0003] Red phosphors suitable for PDP include yttrium gadolinium europium borate, yttrium europium vanadium phosphate, yttrium europium oxide, yttrium europium boroaluminate, etc. Among them, the afterglow of yttrium gadolinium europium borate is too long (about 12ms), and the brightness and saturation of yttrium europium vanadium phosphate Low, yttrium aluminum boroaluminate europium brightness is low, can not meet the requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C09K11/00H01J11/42H01J17/16
Inventor 李永强郭禄华
Owner CAIHONG GRP ELECTRONICS CO LTD
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