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tm for solar spectral modulation 3+ /yb 3+ Double doped α‑nayf 4 Single crystal and preparation method thereof

A solar spectrum and double-doping technology, which is 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, and achieve good thermal, low matrix phonon energy, and luminescence high efficiency effect

Inactive Publication Date: 2017-01-18
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 for solar spectral modulation <sup>3+</sup> /yb <sup>3+</sup> Double doped α‑nayf <sub>4</sub> Single crystal and preparation method thereof
  • tm for solar spectral modulation <sup>3+</sup> /yb <sup>3+</sup> Double doped α‑nayf <sub>4</sub> Single crystal and preparation method thereof
  • tm for solar spectral modulation <sup>3+</sup> /yb <sup>3+</sup> Double doped α‑nayf <sub>4</sub> Single crystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh NaF, KF, YF with a purity greater than 99.99% 3 , TmF 3 , YbF 3 Raw materials, by 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, put the raw materials in the grinder, 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 on the tubular resistor in the platinum tube of the furnace, and then use high-purity N 2 Gas removes the air in the platinum pipe, and conducts leak detection on the platinum pipe; then gradually raises the temperature of the furnace body of the tubular resistance furnace to 790°C, passes HF gas, and reacts for 2 hours to remove possible H 2 O and oxyfluoride, during the reaction process, use NaOH solution to absorb HF gas in the tail gas. After the reaction, stop passing HF gas, close the tube resistance furnace, and finally use high-purity N 2 The gas remov...

Embodiment 2

[0029] Substantially the same as Example 1, the difference is only in 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 are placed in a mill, and milled and mixed for 5 hours to obtain a mixture of uniform powder; after the raw materials are mixed, they are placed in a mill, and then the temperature of the furnace body of the tubular resistance furnace is gradually increased To 800°C, pass HF gas, 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 0.2mm / h, and the furnace temperature drops to At 80°C / h, transparent crystals were obtained. Analysis and Detection of Tm in Crystal by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP) 3+ , Yb 3+ The actual molar content of rare earth ions, x = 0.0048, y = 0.0196, and the crystal chemical form...

Embodiment 3

[0031] Substantially the same as Example 1, the difference is only in 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 are placed in a mill, and milled and mixed for 5 hours to obtain a mixture of uniform powder; after the raw materials are mixed, they are placed in a mill, and then the temperature of the furnace body of the tubular resistance furnace is 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, transparent crystals were obtained. Analysis and Detection of Tm in Crystal by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP) 3+ , Yb 3+ The actual molar content of rare earth ions, x=0.0049, y=0.0398, and the crystal chemical ...

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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 single crystals for solar spectrum modulation, in particular to Tm for solar spectrum modulation 3+ / Yb 3+ Double doped α-NaYF 4 Single crystal and its preparation method. 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 the most effective absorption wavelength of silicon material for sunlight is about 1000nm, and neither ultraviolet light nor infrared light with a wavelength greater than 1100nm in the solar light source can be effectively absorbed. By modulating the solar spectrum, the ultraviolet light and infrared light with a waveleng...

Claims

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Application Information

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Patent Type & Authority Patents(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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