寻找新能源为全球目前面临着的重要课题, 其中最理想的新能源为太阳能。 近红外量子剪裁发光方法可以把硅或锗太阳能电池响应不够灵敏的大能量光子成倍的转换成为太阳能电池响应灵敏的小能量光子, 能够解决光谱失配的问题, 较大幅度的提高太阳能电池的效率。 很有意义。 报道了掺Tm3+Bi3+的铌酸钇磷光粉样品材料的近红外量子剪裁发光的浓度效应。 通过测量激发谱与发光谱, 发现Tm0.058Bi0.010Y0.932NbO4有很强的1 820.0 nm近红外量子剪裁发光; 进一步的分析发现, 它们是由交叉能量传递过程导致的多光子量子剪裁发光; 还发现了有着很强的Bi3+对Tm3+的敏化近红外量子剪裁发光, 302.0 nm光激发导致的Tm0.058Bi0.010Y0.932NbO4相对Tm0.005Y0.995NbO4的1 820.0 nm近红外量子剪裁发光的增强达到175.5倍。 该结果对探索多光子近红外量子剪裁锗太阳能电池比较有意义。

Searching for new energy source is one of the most important projects faced by the global, while the most ideal new energy source is solar cell. Near infrared quantum cutting luminescence method can doubly transfer large energy photon which is not sensitive to Si or Ge solar cell to small energy photon which is sensitive to Si or Ge solar cell. It can resolve the spectral mismatch problem and largely enhance solar cell efficiency. Therefore, it is significant. The concentration effect of near-infrared quantum cutting luminescence of Tm3+Bi3+∶YNbO4 phosphor is reported in present manuscript. Through the measurement of excitation and emission spectra, it is found that the Tm0.058Bi0.010Y0.932NbO4 powder phosphor has intense 1 820.0 nm near-infrared quantum cutting luminescence. Further analysis finds they are multi-photon quantum cutting luminescence induced by the cross-energy transfer process. The population of 1G4 energy level may be directly transferred to lower energy level mainly through {1G4—3H4, 3H6—3H5} and {1G4—3H5, 3H6—3H4} cross-energy transfer processes, i. e. one population of the 1G4 energy level may effectively lead to two populations, which are positioned at the 3H4 and 3H5 energy levels, respectively, mainly through {1G4—3H4, 3H6—3H5} and {1G4—3H5, 3H6—3H4} cross-energy transfer processes. This may also effectively lead to three populations of the 3F4 energy level through {3H4—3F4, 3H6—3F4} cross-energy transfer process from the 3H4 level and multi-phonon non-radiative relaxation from the 3H5 level, respectively. This results in the effective three-photon near-infrared quantum cutting of the 3F4—3H6 fluorescence of Tm3+ ion. It’s also found that the sensitization action of Bi3+ ion to Tm3+ ion is very strong. The enhancement of the 1 820.0 nm near-infrared quantum cutting luminescence, of Tm0.058Bi0.010Y0.932NbO4 relative to Tm0.005Y0.995NbO4, is about 175.5 times, when excited by the 302.0 nm light. The present results are significant for the exploration of the next-generation multi-photon near-infrared quantum cutting germanium solar cell.