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Down-conversion luminescent reinforced composite powder material and preparation method thereof

A composite powder and luminescence enhancement technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low sunlight utilization efficiency, low photoelectric conversion efficiency of solar cells, and difficulty in further improving energy conversion efficiency. Effects of conversion efficiency, simple preparation method, and easy operation

Active Publication Date: 2012-10-10
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the solar cell products on the market are mainly crystalline silicon solar cells. By improving the processing technology of its materials, the highest photoelectric conversion rate of crystalline silicon solar cells can reach 25%, but it is difficult to make further progress only by improving the material processing technology. Improve its energy conversion efficiency
The band gap of crystalline silicon is about 1.12eV, which is equivalent to 1100nm, so it is impossible to completely absorb and convert natural sunlight energy. Only sunlight with a wavelength less than 1100nm can achieve photoelectric conversion in crystalline silicon solar cells, and the wavelength is greater than 1100nm. Infrared light cannot be used
The energy in the solar spectrum is mainly concentrated in the visible light region. The mismatch of the spectrum makes the utilization efficiency of sunlight low. In addition, due to the serious thermal effect of the battery, this eventually leads to low photoelectric conversion efficiency of crystalline silicon solar cells.

Method used

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  • Down-conversion luminescent reinforced composite powder material and preparation method thereof
  • Down-conversion luminescent reinforced composite powder material and preparation method thereof
  • Down-conversion luminescent reinforced composite powder material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: (Y 0.95 Pr 0.04 Yb 0.1 ) PO 4 Preparation of down-conversion luminescence enhanced composite powder material

[0019] Weigh the raw material Y according to the chemical formula according to the stoichiometric ratio 2 O 3 , P 2 O 5 , Pr 2 O 3 , Yb 2 O 3 , Where Pr 2 O 3 The mole fraction is 4%, Yb 2 O 3 The mole fraction is 1%. Put the weighed raw materials into a ball mill tank, and place them in a planetary ball mill with absolute ethanol as the medium for ball milling for 1 hour. The slurry obtained after ball milling is dried, then sintered at 2000°C for 1 hour and then cooled in the furnace. After sintering, the block is crushed in a mortar and sieved to obtain the required down-conversion luminescence enhanced composite powder material. The XRD pattern of its powder material can be seen figure 1 , The emission spectrum under excitation at 450nm wavelength can be seen image 3 .

example 2

[0020] Example 2: (Y 0.97 Pr 0.01 Yb 0.02 ) PO 4 / 0.07TiO 2 Preparation of down-conversion luminescence enhanced composite powder material

[0021] Weigh the raw material Y according to the chemical formula according to the stoichiometric ratio 2 O 3 , P 2 O 5 , Pr 2 O 3 , Yb 2 O 3 And TiO 2 , Where Pr 2 O 3 The mole fraction is 1%, Yb 2 O 3 The mole fraction is 2%, TiO 2 The mole fraction is 7%. Put the weighed raw materials into a ball mill tank, and place them in a planetary ball mill for 12 hours with absolute ethanol as the medium. The slurry obtained after ball milling is dried, then sintered at 1200°C for 3 hours and then cooled in the furnace. After sintering, the block is crushed in a mortar and sieved to obtain the required down-conversion luminescence enhanced composite powder material. The XRD pattern of its powder material can be seen figure 2 , The emission spectrum under excitation at 450nm wavelength can be seen image 3 .

example 3

[0022] Example 3: (Y 0.7 Pr 0.2 Yb 0.1 ) PO 4 / 0.5TiO 2 Preparation of down-conversion luminescence enhanced composite powder material

[0023] Weigh the raw material Y according to the chemical formula according to the stoichiometric ratio 2 O 3 , P 2 O 5 , Pr 2 O 3 , Yb 2 O 3 And TiO 2 , Where Pr 2 O 3 The mole fraction is 20%, Yb 2 O 3 The mole fraction is 10%, TiO 2 The mole fraction is 50%. Put the weighed raw materials into a ball mill tank, and place them in a planetary ball mill for 16 hours with absolute ethanol as the medium. The slurry obtained after ball milling is dried, then sintered at 1000°C for 24 hours and then cooled in the furnace. After sintering, the block is crushed in a mortar and sieved to obtain the required down-conversion luminescence enhanced composite powder material.

[0024] The emission spectrum of the powder material under excitation at 450nm wavelength can be seen Figure 4 .

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Abstract

The invention belongs to the field of solid luminescent materials, and particularly relates to a down-conversion luminescent reinforced composite powder material and a preparation method thereof. The chemical composition expression of the down-conversion luminescent reinforced composite powder material is: (Y1-x-yPrxYby) PO4 / zTiO2, wherein the molar fraction of x is 1-20%, the molar fraction of y is 1-30%, and the molar fraction of z is 0-50%. The down-conversion luminescent reinforced composite powder material comprises Y2O3, P2O5, Pr2O3, Yb2O3 and TiO2, wherein the molar fraction of the Pr2O3 is 1-20%, the molar fraction of the Yb2O3 is 1-30%, and the molar fraction of the TiO2 is 0-50%. The down-conversion luminescent reinforced composite powder material is high in near-infrared emission, luminescent intensity of the material can be further enhanced and emission spectra at the position of 800-1100nm of a near-infrared region can be widened particularly after addition of the TiO2, and the position of a main emission peak perfectly matches with the forbidden bandwidth of silicon to enable photoelectric conversion efficiency of crystalline silicon solar cells to be effectively improved, thereby the down-conversion luminescent reinforced composite powder material is a potential material used for the crystalline silicon solar cells.

Description

Technical field [0001] The invention belongs to the field of solid luminescent materials, and specifically relates to a down-conversion luminescence enhanced composite powder material and a preparation method thereof. Background technique [0002] Due to the annual consumption of non-renewable resources, energy issues have been paid close attention to by governments, academia and the general public. The development of new energy has become an important research topic in the world today. As one of the main directions of new energy development, solar cells have attracted much attention. Governments all over the world strongly support the research and development of solar photovoltaic power generation technology and actively promote its industrialization process. At present, the solar cell products on the market are mainly crystalline silicon solar cells. By improving the processing technology of its materials, the highest photoelectric conversion rate of crystalline silicon solar c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 王如志李开宇曲铭浩严辉张铭王波宋雪梅朱满康侯育冬刘晶冰汪浩
Owner BEIJING UNIV OF TECH