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Tellurate phosphors for up-conversion luminescence, and preparation method and application thereof

A fluorescent powder and tellurite technology, applied in the field of fluorescent powder, achieves the effects of simple preparation method, low energy consumption, and low cost

Active Publication Date: 2015-04-01
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still few reports on the field of preparing phosphors and applying them to OLEDs.

Method used

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  • Tellurate phosphors for up-conversion luminescence, and preparation method and application thereof
  • Tellurate phosphors for up-conversion luminescence, and preparation method and application thereof
  • Tellurate phosphors for up-conversion luminescence, and preparation method and application thereof

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preparation example Construction

[0023] The preparation method of the above-mentioned tellurate up-conversion luminescent phosphor, such as figure 1 shown, including the following steps:

[0024] Step S1, according to the mole percentage, weigh the powder: TeO 2 , 85% to 92%; TiO 2 , 1% ~ 8%; La 2 o 3 , 1% ~ 8%; Tb 2 o 3 , 0.5% to 5%;

[0025] Step S2, mixing and grinding the powder weighed in step S1 for 20-60 minutes to obtain a powder precursor;

[0026] Step S3, calcining the powder precursor in step S2 at 900-1100°C for 0.5-5 hours, then cooling down to 100-300°C, keeping it at this temperature for 0.5-3 hours and then cooling to room temperature to obtain a block product ;

[0027] Step S4, grinding the bulk product in step S3 to obtain the tellurate upconversion luminescent phosphor; the structural formula of the phosphor is aTeO 2 -bTiO 2 -cLa 2 o 3 :dTb 3+ ; where, Tb 3+ are dopant ions, a, b, c, and d are molar coefficients, 0.85≤a≤0.92, 0.01≤b≤0.08, 0.01≤c≤0.08, 0.005≤d≤0.05, and a+b+...

Embodiment 1

[0036] 1. Use powder with a purity of 99.99%: TeO 2 、TiO 2 , La 2 o 3 and Tb 2 o 3 Powder, its molar percentages are 88%, 5%, 5% and 2% respectively;

[0037] 2. Put the above powder in a corundum mortar and grind it for 40 minutes to mix it evenly to obtain a powder precursor;

[0038] 3. Put the powder precursor in a muffle furnace, burn it at 1000°C for 3 hours, then cool it to 200°C and keep it for 2 hours, then cool it naturally to room temperature and take out the block product.

[0039] 4. Grind and pulverize the blocky product to obtain a structural formula of 0.88TeO 2 -0.05TiO 2 -0.05La 2 o 3 :0.02Tb 3+ Up-converting phosphors.

[0040] figure 2 The electroluminescence spectrum figure of the fluorescent powder of the tellurate up-conversion luminescence that is made in embodiment 1; By figure 2 It can be seen that the excitation wavelength is 796nm; the obtained luminescence peak at 485nm corresponds to Tb 3+ ion 5 D.4 → 7 f 6 The transition radiat...

Embodiment 2

[0042] 1. Use powder with a purity of 99.99%: TeO 2 、TiO 2 , La 2 o 3 and Tb 2 o 3 Powder, its molar percentages are 92%, 1%, 2% and 5% respectively;

[0043] 2. Put the above powder in a corundum mortar and grind it for 20 minutes to mix it evenly to obtain a powder precursor;

[0044] 3. Put the powder precursor in a muffle furnace, burn it at 900°C for 5 hours, then cool it to 300°C and keep it for 0.5 hour, then cool it naturally to room temperature to take out the block product;

[0045] 4. Grind and pulverize the blocky product to obtain a structural formula of 0.92TeO 2 -0.01TiO 2 -0.02La 2 o 3 :0.05Tb 3+ Up-converting phosphors.

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Abstract

The invention belongs to the phosphor field, and discloses tellurate phosphors for up-conversion luminescence, and a preparation method and an application thereof. The phosphors have a structural formula of aTeO2-bTiO2-cLa2O3:dTb3+, wherein Tb3+ is doping ions; a, b, c and d represent molar coefficients; a is equal to or greater than 0.85 and less than or equal to 0.92; b is equal to or greater than 0.01 and less than or equal to 0.08; c is equal to or greater than 0.01 and less than or equal to 0.08; d is equal to or greater than 0.005 and less than or equal to 0.05; and a sum of a, b, c and d is equal to 1. The tellurate phosphors for up-conversion luminescence prepared by the invention can excite short-wavelength luminescence of blue light by long-wavelength radiation from infrared to green light, so that the phosphors can make up the insufficiency of blue light materials in present display and luminescent materials.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a tellurate up-converting fluorescent powder and a preparation method and application thereof. Background technique [0002] The full name of OLED is Organic Light Emitting Diode, organic light emitting diode. It has many advantages. Its component structure is simple, its production cost is cheap, and its self-luminous characteristics, coupled with OLED's short response time and bendable characteristics, make it a very wide range of applications. However, it is difficult to obtain stable and efficient OLED blue light materials, which greatly limits the development of white light OLED devices and light source industries. [0003] Up-conversion fluorescent materials can emit visible light and even ultraviolet light under the excitation of long-wave (such as infrared) radiation, and have broad application prospects in the fields of optical fiber communication technology, fiber amplifier, thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88H01L51/54
Inventor 周明杰王平陈吉星张振华
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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