Europium-terbium-codoped rare earth silicate luminescent material, and preparation method and application thereof

A rare earth silicate, luminescent material technology, applied in luminescent materials, chemical instruments and methods, semiconductor devices, etc.

Inactive Publication Date: 2014-05-14
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 is no report on the Eu-terbium co-doped rare earth silicate luminescent material that can be applied to thin-film electroluminescent displays.

Method used

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  • Europium-terbium-codoped rare earth silicate luminescent material, and preparation method and application thereof
  • Europium-terbium-codoped rare earth silicate luminescent material, and preparation method and application thereof
  • Europium-terbium-codoped rare earth silicate luminescent material, and preparation method and application thereof

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Experimental program
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preparation example Construction

[0034] The preparation method of the above-mentioned europium-terbium co-doped rare earth silicate luminescent material comprises the following steps:

[0035] Step S11, according to La a Gd b Lu c SiO 5 :xEu 2+ ,yTb 3+ The stoichiometric ratio of each element is taken as La 2 o 3 , Gd 2 o 3 , Lu 2 o 3 , SiO, Eu 2 o 3 and Tb 4 o 7 Powder, where x is 0.01~0.05, y is 0.005~0.03, a is 0~2, b is 0~2, c is 0~2, and a+b+c=2.

[0036] In this step, preferably, x is 0.03, y is 0.01, a is 0.3, b is 0.5, and c is 1.2.

[0037] Step S12, sintering the uniformly mixed powder at 900°C-1300°C for 0.5-5 hours to obtain a luminescent material of europium-terbium co-doped rare earth silicate, whose chemical formula is La a Gd b Lu c SiO 5 :xEu 2+ ,yTb 3+ , where La a Gd b Lu c SiO 5 is the matrix, europium ions and terbium ions are active elements, x is 0.01~0.05, y is 0.005~0.03, a is 0~2, b is 0~2, c is 0~2, and a+b+c=2 .

[0038] In this step, it is preferable to ...

Embodiment 1

[0069] Select the powder with a purity of 99.99%, and mix 0.3mmol of La 2 o 3 , 0.5 mmol of Gd 2 o 3 , 1.2 mmol of Lu 2 o 3 , 2mmol of SiO, 0.03mol of Eu 2 o 3 and 0.005 mmol Tb 4 o 7 The powder, after uniform mixing, is sintered at 1250°C to form a ceramic target with a diameter of 50mm and a thickness of 2mm, and the target is loaded into a vacuum cavity. Then, the glass substrate with ITO was ultrasonically cleaned with acetone, absolute ethanol and deionized water successively, treated with oxygen plasma, and placed in a vacuum chamber. The distance between the target and the substrate is set to 60mm. Use a mechanical pump and a molecular pump to pump the vacuum of the cavity to 5.0×10 -4 Pa, the working gas flow rate of argon is 25 sccm, the pressure is adjusted to 2.0 Pa, and the substrate temperature is 500°C. The obtained sample was annealed in a 0.01Pa vacuum furnace for 2h at an annealing temperature of 600°C, and the chemical formula was La 0.3 Gd 0.5 L...

Embodiment 2

[0075] Select the powder with a purity of 99.99%, mix 1mmol of Gd 2 o 3 , 1 mmol of Lu 2 o 3 , 2mmol of SiO, 0.005mmol of Eu 2 o 3 and 0.0025 mmol Tb 4 o 7 The powder, after uniform mixing, is sintered at 900°C to form a ceramic target with a diameter of 50 mm and a thickness of 2 mm, and the target is loaded into a vacuum chamber. Then, the glass substrate with ITO was ultrasonically cleaned with acetone, absolute ethanol and deionized water successively, treated with oxygen plasma, and placed in a vacuum chamber. The distance between the target and the substrate was set to 45mm. Use a mechanical pump and a molecular pump to evacuate the vacuum of the chamber to 1.0×10 -3 Pa, the working gas flow rate of argon is 10 sccm, the pressure is adjusted to 0.2 Pa, and the substrate temperature is 250°C. The obtained samples were annealed in a 0.01 Pa vacuum furnace for 1 h at an annealing temperature of 500 °C. The chemical formula is GdLuSiO 5 : 0.01Eu 2+ ,0.005Tb 3+ l...

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Abstract

The invention provides a europium-terbium-codoped rare earth silicate luminescent material with a chemical formula of LaaGdbLucSiO5: xEu2+, yTb3+, wherein LaaGdbLucSiO5 is a matrix, a europium ion and a terbium ion are active elements, x is in a range of 0.01 to 0.05, y is in a range of 0.005 to 0.03, a is in a range of 0 to 2, b is in a range of 0 to 2, c is in a range of 0 to 2, and a+b+c is equal to 2. In the electroluminescent spectrum (EL) of a luminescent film prepared from the europium-terbium-codoped rare earth silicate luminescent material, strong luminescent peaks appear at zones with wavelength of 480 nm and 580 nm, and the luminescent film is applicable to a thin-film electroluminescent display. The invention further provides a preparation method and application of the europium-terbium-codoped rare earth silicate luminescent material.

Description

technical field [0001] The invention relates to a europium-terbium co-doped rare-earth silicate luminescent material, a preparation method thereof, a europium-terbium co-doped rare-earth silicate luminescent film, a preparation method thereof, a thin-film electroluminescence device and a preparation method thereof. Background technique [0002] Thin film electroluminescent display (TFELD) has attracted widespread attention and developed rapidly due to its advantages such as active light emission, full solid state, impact resistance, fast response, large viewing angle, wide application temperature, and simple process. At present, the research on color and even full-color TFELD and the development of multi-band luminescent materials are the development direction of this subject. However, no reports have been reported on the europium and terbium co-doped rare earth silicate luminescent materials that can be applied to thin film electroluminescent displays. Contents of the inv...

Claims

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Application Information

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IPC IPC(8): C09K11/79H01L33/50H01L33/00
Inventor 周明杰王平陈吉星钟铁涛
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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