Tm<3+>/Yb<3+> double-doped alpha-NaYF4 monocrystal for solar spectrum modulating and preparation method thereof

A solar spectrum, double-doping technology, applied in the field of Tm3+/Yb3+ double-doped α-NaYF4 single crystal and its preparation, can solve the problems of poor stability and performance of glass materials, achieve good thermal properties, facilitate large-scale industrial production, and improve quality Good results

Inactive Publication Date: 2015-02-11
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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  • Tm&lt;3+&gt;/Yb&lt;3+&gt; double-doped alpha-NaYF4 monocrystal for solar spectrum modulating and preparation method thereof
  • Tm&lt;3+&gt;/Yb&lt;3+&gt; double-doped alpha-NaYF4 monocrystal for solar spectrum modulating and preparation method thereof
  • Tm&lt;3+&gt;/Yb&lt;3+&gt; double-doped alpha-NaYF4 monocrystal for solar spectrum modulating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh NaF, KF, YF with purity greater than 99.99% 3 , TmF 3 , YbF 3 Raw material, molar ratio NaF:KF:(YF 3 +TmF 3 +YbF 3 )=1.6:1:2.8, and TmF 3 : YbF 3 =1:12, YF 3 :(TmF 3 +YbF 3 )=1: 0.0695, place the raw materials in a mill, grind and mix for 5.5 hours to obtain a mixture of uniform powder; put the mixture in a boat-shaped platinum crucible, and then install the boat-shaped platinum crucible in a tube type resistance furnace in the platinum tube, and then use high-purity N 2 The gas removes the air in the platinum pipeline, and the platinum pipeline is leaked; then the furnace body temperature of the tubular resistance furnace is gradually increased to 790 ° C, HF gas is passed through, and the reaction is carried out for 2 hours to remove the H that may be contained. 2 O and oxyfluoride, in the reaction process, use NaOH solution to absorb HF gas in the exhaust gas. After the reaction is over, stop the HF gas flow, close the tube resistance furnace, and fin...

Embodiment 2

[0029] Basically the same as Example 1, the only difference is the molar ratio NaF:KF:(YF 3 +TmF 3 +YbF 3 ) = 1.6:1:2.8, and TmF 3 : YbF 3 =1:4, YF 3 :(TmF 3 +YbF 3 )=1:0.0256, the raw materials were placed in the mill, and the mixture was milled and mixed for 5 hours to obtain a uniform powder mixture; the raw materials were mixed and placed in the mill, and then the furnace body temperature of the tubular resistance furnace was gradually increased When the temperature reaches 800 °C, HF gas is passed through, the reaction time is 2 hours, the furnace temperature is 970 °C, the inoculation temperature is 840 °C, the temperature gradient of the solid-liquid interface is 80 °C / cm, the crystal growth rate is 0.2 mm / h, and the furnace temperature is lowered to the temperature. At 80°C / h, transparent crystals were obtained. Determination of Tm in Crystals by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP) 3+ , Yb 3+ The actual molar content of rare earth ion...

Embodiment 3

[0031] Basically the same as Example 1, the only difference is the molar ratio NaF:KF:(YF 3 +TmF 3 +YbF 3 ) = 1.6:1:2.8, and TmF 3 : YbF 3 =1:8, YF 3 :(TmF 3 +YbF 3 )=1:0.0989, the raw materials were placed in the mill, and the mixture was milled and mixed for 5 hours to obtain a uniform powder mixture; the raw materials were mixed and placed in the mill, and then the furnace body temperature of the tubular resistance furnace was gradually increased to 770°C, pass HF gas, the reaction time is 5 hours, the furnace temperature is 950°C, the inoculation temperature is 820°C, the temperature gradient of the solid-liquid interface is 60°C / cm, the crystal growth rate is 0.6mm / h, and the furnace temperature drop temperature is 20°C / h to obtain transparent crystals. Determination of Tm in Crystals by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP) 3+ , Yb 3+ The actual molar content of rare earth ions, x=0.0049, y=0.0398, and the crystal chemical formula is α-Na...

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Abstract

The invention discloses a Tm<3+>/Yb<3+> double-doped alpha-NaYF4 monocrystal for solar spectrum modulating and a preparation method thereof. The preparation method is characterized by comprising the step of adding KF serving as a fluxing agent to raw materials NaF, YF3, TmF3 and YbF3 to generate the Tm<3+>/Yb<3+> double-doped alpha-NaYF4 monocrystal. The preparation method has the advantages that due to use of KF with melting point of 858 DEG C as the fluxing agent, the phase balance relationship of melt is changed to finally obtain the large-sized alpha-NaYE4 monocrystal. The alpha-NaYE4 monocrystal has the characteristics of high optical permeability in a wide waveband from ultraviolet ray to intermediate infrared ray, good physical and chemical stability and the like and can be used for effectively modulating a solar spectrum.

Description

technical field [0001] The present invention relates to a single crystal for solar spectrum modulation, in particular to a Tm for solar spectrum modulation 3+ / Yb 3+ Double doped α-NaYF 4 Single crystal and preparation method thereof. Background technique [0002] At present, the main materials for making solar cells are monocrystalline and polycrystalline silicon. The photovoltaic effect of silicon material realizes the conversion of light energy and electric energy. However, the photoelectric conversion efficiency of silicon solar cells is very low, and the photoelectric conversion efficiency on the market is only 18%. This is mainly because the most effective absorption wavelength of silicon material for sunlight is about 1000nm, and neither ultraviolet light nor infrared light with wavelength greater than 1100nm in the solar light source can be effectively absorbed. By modulating the solar spectrum and converting ultraviolet light and infrared light with wavelengths g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00
CPCC30B11/00C30B29/12
Inventor 张加忠夏海平杨硕姜永章符立董艳明李珊珊张约品
Owner NINGBO UNIV
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