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Alkali metal ion enhanced rare earth doped titanate red phosphor and preparation method

An alkali metal ion and rare earth doping technology, applied in the field of phosphor powder, can solve the problems of increase of free alkali metal ions, increase of glass phase, increase of crystal grain size, etc., and achieves high color purity and brightness, simple method and luminous efficiency. improved effect

Active Publication Date: 2017-05-31
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the doping of alkali metal ions will also bring a series of problems, such as the increase of free alkali metal ions, the increase of grain size, and the increase of glass phase, all of which need to be controlled in raw material selection and heat treatment, so as to reduce or even eliminate these adverse effects

Method used

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  • Alkali metal ion enhanced rare earth doped titanate red phosphor and preparation method
  • Alkali metal ion enhanced rare earth doped titanate red phosphor and preparation method
  • Alkali metal ion enhanced rare earth doped titanate red phosphor and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of ZnTiO 3 : 0.005Eu 3+ Sol, the specific configuration method is as follows:

[0036] (1) According to ZnTiO 3 : 0.005Eu 3+ Chemical formula and stoichiometric ratio, determine the ratio of raw materials, slowly add 12.7ml glacial acetic acid dropwise to 20ml butyl titanate, stir for 25min until the solution is uniform, as A 1 liquid;

[0037] (2) Dilute 2.65ml nitric acid to 1mol / L, as B 1 liquid;

[0038] (3) Stir A 1 At the same time A 1 Slowly add solution to B 1 liquid, this mixture is denoted as C 1 Liquid, then, weigh zinc nitrate hexahydrate and add C 1 solution, stirred at room temperature for 25 min;

[0039] (4) 0.0517g europium oxide is dissolved in nitric acid according to the stoichiometric ratio, and added to C 1 liquid, this mixture is denoted as D 1 liquid;

[0040] (5) Heat and stir at 60°C D 1 solution for 5 hours until a light yellow translucent clear liquid is formed, and left to age for 23 hours to obtain a uniform, stab...

Embodiment 2

[0043] Preparation of ZnTiO 3 : 0.01Eu 3+ Sol, the specific configuration method is as follows:

[0044] (1) According to ZnTiO 3 : 0.01Eu 3+ Chemical formula and stoichiometric ratio, determine the ratio of raw materials, slowly add 12.7ml glacial acetic acid dropwise to 20ml butyl titanate, stir for 35min until the solution is uniform, as A 1 liquid;

[0045] (2) Dilute 5.3ml of nitric acid to 0.5mol / L, as B 1 liquid;

[0046] (3) Stir A 1 At the same time A 1 Slowly add solution to B 1 liquid, this mixture is denoted as C 1 Liquid, then, weigh zinc nitrate hexahydrate and add C 1 solution, stirred at room temperature for 35min;

[0047] (4) 0.1035g europium oxide is dissolved in nitric acid according to the stoichiometric ratio, and added to C 1 liquid, this mixture is denoted as D 1 liquid;

[0048] (5) Heat and stir at 55°C D 1 solution for 7 hours until a light yellow translucent clear liquid is formed, and left to age for 23 hours to obtain a uniform, sta...

Embodiment 3

[0051] (1) According to ZnTiO 3 : 0.015Eu 3+ Chemical formula and stoichiometric ratio, determine the ratio of raw materials, slowly add 12.7ml glacial acetic acid dropwise to 20ml butyl titanate, stir for 30min until the solution is uniform, as A 1 liquid;

[0052] (2) Dilute 1.325ml nitric acid to 1.5mol / L, as B 1 liquid;

[0053] (3) Stir A 1 At the same time A 1 Slowly add solution to B 1 liquid, this mixture is denoted as C 1 Liquid, then, weigh zinc nitrate hexahydrate and add C 1 solution, stirred at room temperature for 30 min;

[0054] (4) 0.1552g europium oxide is dissolved in nitric acid according to the stoichiometric ratio, and added to C 1 liquid, this mixture is denoted as D 1 liquid;

[0055] (5) Heat and stir at 55°C D 1 solution for 7 hours until a light yellow translucent clear liquid is formed, and left to age for 23 hours to obtain a uniform, stable and transparent light yellow sol;

[0056] (6) Dry the sol in an oven at 80°C for 24 hours to o...

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Abstract

The invention discloses alkali-metal-ion-reinforced red light type fluorescent powder formed by adulterating titanate in rare earth and a preparation method. The fluorescent powder is formed by adulterating rare earth ions Eu<3+> and charge compensation ions M<+> to a base material ZnTiO<3>, and the general chemical formula is ZnTiO<3>: xEu<3+>, yM<+>, wherein x is greater than or equal to 0.5% and less than or equal to 2.5%, y is greater than or equal to 1.5% and less than or equal to 8.5%, and M<+> represents alkali metal ions. According to the fluorescent powder, the adverse effect caused by introduction of alkali metal is eliminated by adjusting the heat treatment process, the luminous efficiency of a rare-earth-titanate luminescent material can be greatly improved under the same excitation condition, the wavelength of emitted light is not changed, the rare-earth-titanate luminescent material is good in luminescence property, color purity and luminance of the emitted light after being exited are both improved, and the fluorescent powder can be applied to a white-light-used LED. According to the preparation method of the fluorescent powder, a sol-gel preparation technology is adopted, the method is simple, the cost is low, the heat treatment process is simple and easy to control, and actual production of the material is facilitated.

Description

technical field [0001] The invention relates to an alkali metal ion-enhanced rare earth-doped titanate red-light fluorescent powder and a preparation method thereof, belonging to the field of fluorescent powder. Background technique [0002] Rare earth luminescent materials are one of the most important materials for the preparation of high-power white LEDs, and white light can be achieved by coating highly efficient trichromatic phosphors on near-ultraviolet and blue LED chips. At present, the main phosphors used in white LEDs are: red phosphor Y 2 o 2 S:Eu 3+ , green phosphor ZnS:(Cu 2+ ,Al 3+ ), blue phosphor BaMgAl 10 o 17 :Eu 2+ . Due to the red phosphor Y 2 o 2 S:Eu 3+ It cannot be effectively excited in the near-ultraviolet region, its luminous brightness is only 1 / 8 of that of green / blue phosphors, and its performance is unstable and its lifespan is short. These shortcomings have become important factors restricting the development of white LEDs. Since Di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67
CPCY02B20/00
Inventor 焦宝祥赵景川柳嘉伟金益楠贾诲
Owner YANCHENG INST OF TECH
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