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Nano fluorescent particles doping with rare-earth ions and relevant application thereof

A technology of nanoparticles and rare earth metal ions, which is applied in the field of nanoparticles in solar cells, can solve the problems of large particle size of inorganic phosphors, low absorption probability quantum efficiency, and unresolved absorption probability, so as to avoid repeated absorption and realize wavelength conversion , the effect of high fluorescence efficiency

Inactive Publication Date: 2010-07-28
EI DU PONT DE NEMOURS & CO
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  • Abstract
  • Description
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Problems solved by technology

Shalav et al. proposed in APPLIED PHYSICS LETTERS 86, 013505 (2005) to use erbium-doped fluoride as a fluorescent upconverter to improve the efficiency of solar cells. However, fluorescent upconversion is a nonlinear optical process, and the absorption probability and quantum efficiency of photoconversion are different. very small
Moreover, the particle size of these inorganic phosphors is too large, which seriously affects the light transmittance of the surface layer of the solar cell, which will further reduce the energy conversion efficiency of the solar cell.
In recent years, WO2007133344 and CN101188255 disclosed nanoscale rare earth inorganic particles as photoconversion agents for solar cells, but they did not solve the problems of low absorption probability, low fluorescence efficiency, and solar spectrum mismatch

Method used

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  • Nano fluorescent particles doping with rare-earth ions and relevant application thereof
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  • Nano fluorescent particles doping with rare-earth ions and relevant application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Preparation of rare earth europium (Eu) doped tin dioxide (SnO 2 ) Nanoparticles: add 2mol SnCl 4 ·5H 2 O and 0.1mol EuCl 3 Dissolve in 1L deionized water. Under stirring condition, drop 2mol NH of precipitation agent 4 OH to drip into SnCl 4 ·5H:O and EuCl 3 In the solution, the end-point pH is controlled to 4 to prepare the tin dioxide precursor sol, which is left for 24 hours at room temperature for aging. Wash with deionized water and suction filtration to remove Cl ions in the colloid. Then heated at 80℃ to obtain transparent nano-SnO 2 Viscous liquid. Then put it in a muffle furnace and calcine at 500℃ for 2 hours to obtain Eu-doped SnO 2 The size range of nanoparticles is 2nm-10nm.

Embodiment 2

[0069] Preparation of rare earth samarium (Sm) doped zinc dioxide (ZnO) nanoparticles: 0.3 grams of samarium oxide (Sm 2 O 3 ) Dissolved in 20mL HNO 3 To obtain samarium oxide in nitric acid solution; add 9.7 grams of Zn(NO 3 ) 2 ·6H 2 O is dissolved in water to prepare an aqueous solution of zinc nitrate. The two solutions were mixed, heated with magnetic stirring for 1.5 hours, and then the excess nitric acid was evaporated until the pH was neutral, and then cooled to room temperature. Drop 10 mL of ammonia water drop by drop to make the solution fully precipitate, and wash with deionized water several times until the pH is neutral. The precipitate was dried at 120°C for 2 hours and annealed in a high temperature furnace at 800°C for 3 hours. After cooling and grinding, ZnO:Sm nanoparticles with an average particle size of 80 nm were obtained.

Embodiment 3

[0071] Preparation of rare earth (Tb) doped titanium dioxide (TiO 2 ) Nanoparticles: Dissolve 1ml of tetra-n-butyl titanate in 20ml of ethanol, then add 0.2ml of europium acetate (Eu(CH 3 COO) 3 ·6H 2 O) Deionized water solution. Eu ion and TiO 2 The molar ratio of 5% is 5%. Magnetic stirring was carried out at room temperature for 3 hours, and then heated at 120°C for 6 hours. The resulting precipitate was centrifuged in a centrifuge and washed repeatedly with ethanol, and then dried at 50°C. Then it was put into a muffle furnace and calcined at 600℃ for 2 hours, and the calcination temperature was increased at a rate of 4℃ / min. Tb-doped TiO was obtained. 2 The average particle size of nanoparticles is 10nm.

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Abstract

The invention provides nano fluorescent particles doping with rare-earth ions. The grain size of the nano particles is 1-200nm, and the nano particles comprise a nano particle matrix and rare-earth ions. The invention also provides a solar battery containing the nano particles.

Description

Technical field [0001] The invention relates to a nano fluorescent particle doped with rare earth element ions and the use of the nano particle in a solar cell. Background technique [0002] The rapid development of global technology and economic activities has led to a surge in human energy demand, and the phenomenon of insufficient energy in the future has emerged. The environmental pollution caused by the use and discharge of fossil fuels has become a major issue that cannot be ignored in countries all over the world. The inexhaustible and inexhaustible solar energy is a clean, renewable and green energy. Solar power generation technology is conducive to purifying the environment and reducing pollution. It is an important way for mankind to fundamentally solve energy problems. However, the photoelectric conversion efficiency of solar cells is low, and the cost of power generation is too high, which is called a bottleneck restricting the wide application of solar power. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/02H01L31/055
CPCY02E10/50Y02E10/52
Inventor 王颖娟朱红军
Owner EI DU PONT DE NEMOURS & CO
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