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Pr/Yb doped yttrium lithium fluoride monocrystal used for modulation of solar spectrum and preparation method thereof

A yttrium lithium fluoride, solar spectrum technology, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve problems such as restricting large-scale practical application, and achieve excellent light resistance performance, good quality, physical and chemical properties good stability

Inactive Publication Date: 2012-12-12
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, quantum tailoring materials doped with rare earth ions mainly include phosphor powder and glass. Due to the large scattering effect of phosphor on sunlight, this has become the biggest bottleneck restricting its large-scale practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] LiF, YF with a purity greater than 99.99% 3 , PrF 3 , YbF 3 Mix according to mole percentage 51.5%: 46.4%: 0.3%: 1.8%, place in a mill, grind and mix for 5-6 hours to obtain a mixture of uniform powder, place the mixture in a boat-shaped platinum crucible, and then install In the platinum tube of the tube resistance furnace, then use N 2 Remove the air in the platinum pipeline with the exhaust gas, then gradually raise the temperature of the furnace body to 750-815°C, and carry out the reaction treatment for 2 hours under the HF gas, and the reaction treatment is completed. Gas and tube resistance furnaces, with N 2 The residual HF gas in the gas cleaning pipeline is gradually cooled to room temperature to obtain polycrystalline powder. The polycrystalline powder is placed in a mill and ground into powder, then placed in a Pt crucible and compacted, and the Pt crucible is sealed. The Pt crucible is placed in a silicon-molybdenum rod furnace, and the crystal is grown...

Embodiment 2

[0017] It is basically the same as Example 1, the only difference is LiF, YF 3 , PrF 3 , YbF 3 The molar percentage is 51.5%: 42.2%: 0.3%: 6%, the reaction treatment is 3 hours, the temperature gradient of the solid-liquid interface is 40-50 °C, the crucible descending speed is 0.4-0.5 mm per hour, after the crystal growth is completed, the Hours 40 ~ 50 ℃ lower furnace temperature to room temperature, where X is about 0.06, Y is about 0.003, Pr 3+ with Yb 3+ The conversion efficiency is about 75.6%, and the fluorescence intensity at 900-1000nm is 100.

Embodiment 3

[0019] It is basically the same as Example 1, the only difference is LiF, YF 3 , PrF 3 , YbF 3 The molar percentage is 51.5%: 36.2%: 0.3%: 12%. After 4 hours of reaction treatment, the temperature gradient of the solid-liquid interface is 70-80°C, and the crucible descending speed is 1.5-2mm per hour. Hours 70 ~ 80 ℃ lower the furnace temperature to room temperature, where X is about 0.12, Y is about 0.003, Pr 3+ with Yb 3+ The conversion efficiency is about 80.4%, and the fluorescence intensity at 900-1000nm is 40.6.

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Abstract

The invention discloses a Pr / Yb doped yttrium lithium fluoride monocrystal used for modulation of a solar spectrum and a preparation method thereof. The LiYF4 monocrystal has the characteristics of low phonon energy, high broadband optical transmission, good physicochemical stability and the like. Pr<3+> and Yb<3+> ions are simultaneously doped into the LiYF4 monocrystal, and the concentration of the doped Yb<3+> ions is greater than the concentration of the doped Pr<3+> ions; under excitation of 480-nm light, energy of the Pr<3+> ions is transferred to the Yb<3+> ions so as to allow each Pr<3+> ion to absorb a photon with an ultraviolet wavelength of 480 nm and each Yb<3+> ion to release two near-infrared photons with a wavelength of 980 nm; and thus, modulation of a solar spectrum is effectively realized, high luminous efficiency is obtained, and the Pr / Yb doped yttrium lithium fluoride monocrystal has excellent resistance to light irradiation, mechanical properties, thermal properties, physicochemical performance and optical transmission. The preparation method for the monocrystal is simple, and the prepared monocrystal has high purity and good quality.

Description

technical field [0001] The invention relates to a single crystal for solar spectrum modulation, in particular to a Pr / Yb doped yttrium lithium fluoride single crystal and a preparation method for solar spectrum modulation. Background technique [0002] At present, the main materials for making solar cells are monocrystalline and polycrystalline silicon. The conversion of light energy and electrical energy is realized through the photovoltaic effect of silicon materials. However, the photoelectric conversion efficiency of silicon solar cells is very low. The photoelectric conversion efficiency of the current market is only 18%. This is mainly because ultraviolet light with a wavelength of less than 400nm and infrared light with a wavelength greater than 1100nm in the solar light source cannot be effectively absorbed. The maximum absorption of light by silicon materials is at about 1000nm. Spectral modulation technology usually has two technical routes: one is to absorb multip...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B11/00
Inventor 夏海平胡建旭汪沛渊彭江涛张约品
Owner NINGBO UNIV
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