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Vacuum ultraviolet excitation materials of praseodymium-doped composite molybdenum tungstate and propose thereof

A composite molybdenum tungstate and vacuum ultraviolet technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of inability to transfer energy, unstable performance, and inability to use, so as to improve absorption efficiency and luminescence performance Effect

Inactive Publication Date: 2013-05-15
熊飞兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early studies focused on fluoride matrix materials, but the biggest drawback of this type of matrix material is that it is expensive to prepare and unstable in performance
Recently, the research on oxide matrix materials has been increasing, but the main defect of this type of matrix materials is that the matrix materials have strong absorption in the vacuum ultraviolet region, and at the same time, this part of the energy cannot be transferred to the doped rare earth ions, so it is difficult to obtain high-efficiency Phosphor material
The second problem is that Pr 3+ The first photon wavelength emitted by doped down-conversion luminescence is near-ultraviolet photons around 400nm, and this wavelength is not conducive to the application in the field of display and lighting
At present, some researchers are also trying to improve the absorption efficiency of materials in the vacuum ultraviolet region through the energy transfer between host crystals and rare earth ions, such as G d 3+ Doped Na(Y,Gd)FPO 4 The medium matrix crystal itself has high absorption in the vacuum ultraviolet region, and at the same time, there is energy transfer between rare earth ions, which can obtain better vacuum ultraviolet excitation efficiency, but G d 3+ There is a photon of about 200nm in the down-converted luminescence, which is a photon that cannot be used in green lighting and plasma flat panel displays.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0010] Example 1: the raw material Cs 2 CO 3 、MoO 3 、WO 3 、Sc 2 o 3 and Pr 6 o11 respectively placed at 160 o C in the oven for more than 10 hours to remove the moisture in the raw materials. Then the above raw materials were pressed by Pr 3+ CsScWO with a doping concentration of 1.5 at.% 4 MoO 4 The ratio of the crystals is required to be weighed, and the prepared raw materials are fully mixed on the drum mixer, and then the oil pressure is 4 tons / cm 2 The pressure is pressed into a sheet of Φ50mm. Place the flakes at 600-700 o Sinter at constant temperature in the furnace of C for 5 hours, then grind and press the thin skin into 800-1050 o The furnace of C is sintered again until the sintered material is identified as Pr by X-ray phase analysis. 3+ Doped CsScWO 4 MoO 4 Single crystal powder, the crystal belongs to the monoclinic system, the unit cell parameters are: a=5.73?, b=7.90?, c=5.46?, α=γ=90 o , β=115.4 o , Z=4. Under the excitation of vacuum ultrav...

example 2

[0011] Example 2: Raw material Cs 2 O, Sc 2 o 3 and Pr 6 o 11 、Na 2 WO 4 、Na 2 MoO 4 、HNO 3 Both NaOH and NaOH were purchased analytically pure samples without further purification. Will Cs 2 O, Sc 2 o 3 and Pr 6 o 11 Raw material by Pr 3+ CsScWO with a doping concentration of 1.5 at.% 4 MoO 4 The ratio of the crystal is required to be weighed, and the HNO 3 Dissolve the weighed raw materials into it while heating, and dissolve the excess HNO 3 Distilled off, and then the obtained product was dissolved in deionized water; press Pr 3+ CsScWO with a doping concentration of 1.5 at.% 4 MoO 4 The proportion of crystals weighed by Na 2 WO 4 and Na 2 MoO 4 Dissolve in deionized water while stirring, and then slowly add the solution to the previously obtained mixture, while adding an appropriate amount of HNO 3 or NaOH to adjust the pH value of the mixture to 7, and at the same time, stir the solution with a magnetic rod to obtain a solution containing a cert...

example 3

[0012] Example 3: the raw material Li 2 CO 3 、MoO 3 、WO 3 , La 2 o 3 and Pr 6 o 11 respectively placed at 160 o C in the oven for more than 10 hours to remove the moisture in the raw materials. Then the above raw materials were pressed by Pr 3+ LiLaWO with a doping concentration of 1.5 at.% 4 MoO 4 The ratio of the crystals is required to be weighed, and the prepared raw materials are fully mixed on the drum mixer, and then the oil pressure is 4 tons / cm 2 The pressure is pressed into a sheet of Φ50mm. Place the flakes at 600-700 o Sinter at constant temperature in the furnace of C for 5 hours, then grind and press the thin skin into 800-1050 o The furnace of C is sintered again until the sintered material is identified as Pr by X-ray phase analysis. 3+ Doped LiLaWO 4 MoO 4 Single crystal powder, the crystal belongs to the tetragonal crystal system, the space group is I4 1 / a, the cell parameters are: a=b=5.28?, c=11.46?, α=β=γ=90 o , Z=4.

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Abstract

The invention relates to a preparation method, a luminescence mechanism and a purpose of vacuum ultraviolet excitation materials of praseodymium-doped composite molybdenum tungstate, and relates to a field of the vacuum ultraviolet excitation materials and luminescent materials. Praseodymium-doped composite molybdenum tungstate phosphor materials are stable in physical and chemical properties when excited by vacuum ultraviolet, and excellent in luminescent property under a high temperature. Matrix crystal of such materials can absorb vacuum ultraviolet photons and transmit excitation energy to the doped Pr<3+> ion through energy transmission; and then excited Pr<3+> ion return to a ground state and continuously emit two photons, wherein one near ultraviolet photon is converted into a visible photon through an energy transmission process with the tungstate in the matrix materials, thereby realizing down-conversion luminescence of absorbing one vacuum ultraviolet photon and continuously emitting two visible photons. Therefore, a fluorescence quantum efficiency of the materials can theoretically reach 200 %; the material has a high absorption efficiency, a high energy conversion efficiency and a high luminescence efficiency in a vacuum ultraviolet band; and the luminescent property of the material is stable at the high temperature and under a vacuum ultraviolet radiation condition. Such materials can be used as luminescent materials in vacuum ultraviolet excitation fields such as green lighting of mercury-free fluorescent, plasma flat panel display and the like.

Description

technical field [0001] The invention relates to the field of vacuum ultraviolet excitation materials and luminescent materials, in particular to the synthesis and application of praseodymium ion-doped molybdenum tungstate that can be applied in the above fields. Background technique [0002] At present, energy shortage and environmental pollution have become two major problems faced by human beings. Mercury fluorescent lamps used by people are closely related to these two problems, because it is a widely used lighting fixture, but as we all know, mercury has serious pollution to the environment. If mercury fluorescent lamps can reduce the use of mercury and improve its luminescence Efficiency is bound to be beneficial to energy saving and environmental protection. Therefore, the development of green lighting lamps, that is, the research and development of vacuum ultraviolet light generated by inert gas discharge to replace the luminescent material excited by mercury dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 不公告发明人
Owner 熊飞兵
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