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Tb<3+>/Yb<3+> double doped lithium lutetium fluoride single crystal for solar spectrum modulation and preparation method thereof

A technology of lithium lutetium fluoride and solar spectrum, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of poor stability and performance of glass materials, and achieve simple preparation methods, excellent thermal properties, and phonon energy low effect

Inactive Publication Date: 2014-04-30
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 and the poor stability of glass materials, this has become a major constraint for its large-scale The biggest bottleneck for practical application at scale

Method used

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  • Tb&lt;3+&gt;/Yb&lt;3+&gt; double doped lithium lutetium fluoride single crystal for solar spectrum modulation and preparation method thereof
  • Tb&lt;3+&gt;/Yb&lt;3+&gt; double doped lithium lutetium fluoride single crystal for solar spectrum modulation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] LiF and YF with purity greater than 99.99% 3 , TbF 3 , YbF 3 Mix according to the mole percentage of 51.5:40.45:0.25:7.80, place it in a mill, grind and mix for 5 hours to obtain a uniform powder mixture. The mixture is placed in a boat-shaped platinum crucible, and then installed in a tubular resistance furnace In the platinum pipe, then first use N 2 Exhaust the air in the platinum pipeline, and then gradually increase the temperature of the furnace body to a temperature of 800 ℃. Under the HF gas, the reaction treatment is 2 hours, and the reaction treatment is completed. During the treatment, the HF tail gas is absorbed by NaOH solution, and the HF gas and Tubular resistance furnace, use N 2 Purge the residual HF gas in the pipeline and gradually cool it to room temperature to obtain polycrystalline powder. The polycrystalline powder is ground into powder by a mill, and then placed in a Pt crucible and compacted. The Pt crucible is sealed and the sealed The Pt crucibl...

Embodiment 2

[0022] Basically the same as Example 1, except LiF, LuF 3 , TbF 3 , YbF 3 Molar percentage 51.5:36.25:0.25:12.00, reaction treatment for 3 hours, temperature gradient of solid-liquid interface is 90℃ / cm, crucible descending speed is 0.5mm / h, after crystal growth is over, the furnace temperature is lowered at 50℃ per hour To room temperature, sampling and measuring x = 0.0730, y = 0.0032, the chemical formula of the single crystal is LiLu 0.9238 Yb 0.073 Tb 0.0032 F 4 . The X-ray diffraction pattern of the sample is similar to Example 1. Then, each obtained sample was polished into a thin slice with a thickness of 2 mm, maintaining the same optical test conditions as in Example 1, and the obtained fluorescence intensity was comparable to that in Example 1. Under 486nm light excitation, fluorescence spectroscopy and Tb 3+ Characteristic 542nm fluorescence lifetime test. See the test results figure 2 , 900-1000nm fluorescence intensity is 91 units. According to the test result...

Embodiment 3

[0024] Basically the same as Example 1, except LiF, LuF 3 , TbF 3 , YbF 3 The molar percentage is 51.5:34.25:0.25:14.00, the reaction treatment is 4 hours, the temperature gradient of the solid-liquid interface is 80℃ / cm, the crucible descending speed is 1mm / h, after the crystal growth is over, the furnace temperature is lowered to 70℃ per hour. At room temperature, sampling and measuring x = 0.0540, y = 0.0033, the chemical formula of the single crystal is LiLu 0.9427 Yb 0.054 Tb 0.0033 F 4 . The X-ray diffraction pattern of the sample is similar to Example 1. Then, each obtained sample was polished into a thin slice with a thickness of 2 mm, maintaining the same optical test conditions as in Example 1, and the obtained fluorescence intensity was comparable to that in Example 1. Under 486nm light excitation, fluorescence spectroscopy and Tb 3+ Characteristic 542nm fluorescence lifetime test. See the test results figure 2 , 900-1000nm fluorescence intensity is 75 units. Acc...

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Abstract

The invention discloses a Tb<3+> / Yb<3+> double doped lithium lutetium fluoride single crystal for solar spectrum modulation and a preparation method of the Tb<3+> / Yb<3+> double doped lithium lutetium fluoride single crystal. A LiLuF4 single crystal has the characteristics of high optical permeability, good physicochemical stability and the like from ultraviolet to intermediate infrared broadband, Tb<3+> and ions are doped simultaneously in the LiLuF4 single crystal, light energy of 486-nanometer wavebands absorbed by Tb<3+> ions is transferred to Yb<3+> ions under excitation of 486-nanometer light, then the Yb<3+> ions emit 980-nanometer light, so that Tb<3+> ions absorb a photon at 486-nanometer waveband, the Yb<3+> ions release two near infrared photons which are about 980 nanometers through an energy transfer process to effectively modulate a solar spectrum. The modulated solar spectrum can be effectively absorbed by crystalline silicon materials to obtain a higher solar energy conversion efficiency. The Tb<3+> / Yb<3+> double doped lithium lutetium fluoride single crystal has excellent thermal properties, mechanical properties, light irradiation resistance, physicochemical properties and permeation performances. The single crystal is simple in preparation method, high in single crystal purity, good in quality and long in service life.

Description

Technical field [0001] The invention relates to a single crystal used for solar spectrum modulation, in particular to a terbium ytterbium rare earth ion double-doped yttrium lithium fluoride single crystal used for solar spectrum modulation and a preparation method. Background technique [0002] At present, the main materials for making solar cells are monocrystalline and polycrystalline silicon. The photovoltaic effect of silicon materials realizes the conversion of light energy and electric energy. However, the photoelectric conversion efficiency of silicon solar cells is very low, and the current market photoelectric conversion efficiency only reaches 18%. This is mainly because the most effective absorption wavelength of solar light of silicon materials is about 1000nm, and the ultraviolet light in the solar light source and infrared light with a wavelength greater than 1100nm cannot be effectively absorbed. By modulating the solar spectrum to convert ultraviolet light and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00
Inventor 夏海平符立董艳明李珊珊张约品
Owner NINGBO UNIV
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