Preparation And Luminescent Properties Of Near-infrared Quantum Cutting Glasses

Shortage of energy and environment pollution are increasingly restricting the sustainable developmentof the society in the future, renewable energy such as solar energy technology represents the developmentdirection of clean energy. Solar photovoltaic industry has the character of entire sustainabledevelopment.It has been the energy structure of human society gradually, and it will become an importantpart of the basic energy in the future. The wavelength of solar spectrum is in the range of280nm-2500nm,but in the normal circumstances,only the energy band gap,whose energy is greater than the crystalline Sisolar cells （Eg>1.12eV, λ <1100nm）, can be absorbed. And the heat of charge carrier will also reducethe efficiency of the battery, and the energy band gap,whose energy is less than the crystalline Si solarcells （Eg<1.12eV, λ>1100nm）, can not be absorbed by the battery.The spectral modulation can makethe crystalline Si solar cells to absorb sunlight more fully and more equitably. So it is one of the effectiveways to improve the photoelectric conversion efficiency of the crystalline Si solar cells.It is also a widelyconcerned focus problem. It is one of the most effective spectral modulation that the surface of crystallineSi solar cells can assemble luminescence layer material of quantum cutting down-conversion.Luminescence layer material of quantum cutting down-conversion doped with rare earth ions has two steps.The first step is to absorb a short-wave photons which cannot be response of absorption of a battery（300nm⁵50nm）.The second step is to emit two or more near-infrared photon which can marry withthe energy band gap of crystalline Si solar cells （¹000nm）. Then it will reach the aim to improve thephotoelectric conversion efficiency of the crystalline Si solar cells. This paper mainly studied for quantum silicon-based solar cell efficiency cutting downconversionluminescence layer material preparation, photoluminescence, discusses the feasibility analysis of some ionmatching：1. It has introduced the research background of quantum cutting, the establishment of quantum cuttingmodel of solar cell. The quantum cutting principle, concept, development history and the main way ofrealizing quantum cutting are introduced. The spectral properties and theory of Yb³⁺ions and the ion is alsopresented. Finally, It has introduced the selected topic significance and the structure arrangement of thispaper.2. The method of oxyfluoride glass prepared in this study and the characteristics of characterizationmethods etc. has introduced in this paper.3. It has Study of Ce³⁺/Yb³⁺co-doped oxyfluoride glass preparation and quantum cuttingdownconversion luminescence, excitation of Ce³⁺ions at a wavelength of about322nm light, Ce³⁺/Yb³⁺co-doped glass not only emit Ce³⁺ion peaks for light characteristics of377nm (5d→4f transitions of Ce³⁺ion), also emit900^optical characteristic of the near infrared1100nm band Yb³⁺ion (²F5/2→²F7/2transition of Yb³⁺). Monitoring of Ce³⁺ion377nm light-emitting and Yb³⁺ion977nm light get excited4f→5d transition spectra showed Ce³⁺ion excitation peak, the Ce³⁺transfer to the Yb³⁺energy, calculationwas given the highest quantum cutting efficiency is191%, the highest, concentration quenching ofquantum efficiency of181.3%.4. It has study of Bi³⁺/Yb³⁺codoped oxyfluoride glass preparation and quantum-cuttingdown-conversion luminescent, with a wavelength of about303nm light excitation, light characteristics of Bi³⁺/Yb³⁺co-doped glass can transmit not only Bi³⁺418nm, also emit Yb³⁺ions in the near infrared bandof900¹100nm (²F5/2→²F7/2transition Yb³⁺ion). Monitoring of Bi³⁺418nm and Yb³⁺977nm nearinfrared excitation spectra were obtained for Bi³⁺:¹S0→³P1transition peak, the Bi³⁺transfer to the Yb³⁺energy, calculation was given the highest quantum cutting efficiency of168%.Finally, summarizes the work and introduces the prospect of some difficulties, quantum cutting workand future development trend.