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中文摘要：
观测到一种以Tb^3＋-Er^3＋进行光谱转换的量子剪裁现象。一个高能紫外光子（Tb^3＋的7F6→5L1）被量子剪裁成两个低能光子：一个是近红外光子（Er^3＋的4I9/2→4I15/2）,另一个是蓝色光子（Tb^3＋的5D4→7F6）,它们两个都可以被GaAs太阳能电池有效地吸收。量子剪裁效率高达188%,接近理论极限的200%。从Tb^3＋（5L1→5D4）到Er^3＋（4 I15/2→4 I9/2）的能量传递的能量失配是237 cm-1,比NaYF4中的声子能400 cm-1小,能量传递是近共振的。Tb^3＋施主间的能量迁移可以近似地用扩散模型处理,从Tb^3＋-Er^3＋对之间能量传递的初始过程发现,偶极-偶极相互作用占主导地位。
英文摘要：
In order to reduce thermal loss due to spectral mismatch of the solar cell absorption,the quantum cutting with Tb^3＋-Er^3＋ couples as spectral converters is experimentally observed.One high energy ultraviolet photon（7F6→5L1 of Tb^3＋） is quantumly cut into two lower energy photons：one is in near-infrared（4I9/2→4I15 of Er^3＋） and the other in blue region（5D4→7F6 of Tb^3＋）,both of which can be efficiently absorbed by solar cells.A quantum efficiency,ηQE of up to 188% is calculated which is close to the theoretical limit of 200%.The energy mismatch in the energy transfer from Tb^3＋（5L1→5D4）to Er^3＋（4I9/2→4I15/2） is 237 cm-1,less than a phonon energy of 400 cm-1 in NaYF4,making the energy transfer nearly resonant.The energy migration among Tb^3＋ donors is treated approximately by the diffusion model and the initial process of energy transfer among the Tb^3＋-Er^3＋ couples is found to be dipole-dipole interactions.
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