改变锗原子的连接角度和长度的同时，将它们的电子踢到传导带所需的能量也变化了。
Changing the Angle and length of the bonds between germanium atoms also changed the energies required to kick their electrons into the conduction band.
这个额外的电子填充了传导带的较低能级，有效的导致了被激发的电子溢入较高，释放光子的能级。
The extra electron fills up the lower-energy state in the conduction band, causing excited electrons to, effectively, spill over into the higher-energy, photon-emitting state.
但实际上，电子在这种传导带中存在两种形态。
But in fact, an electron in the conduction band can be in one of two states.
第二步策略是减小两个传导带态的能量落差，这样一来受激发电子就更容易溢入光子释放态。
The second strategy was to lower the energy difference between the two conduction-band states so that excited electrons would be more likely to spill over into the photon-emitting state.
当一个电子跃迁到传导带，它会在价带留下一个“凹陷”。
When an electron leaps into the conduction band, it leaves behind a hole in the valence band.
他们发现这些能级皆低于TiO2的传导带，这意味着从量子点放射出的热电子能够从PbSe传导到TiO2。
They found that these states were always below the TiO2 conduction band, which means that hot electrons from the quantum dot can transfer from the PbSe to the TiO2.
他们发现这些能级皆低于TiO2的传导带，这意味着从量子点放射出的热电子能够从PbSe传导到TiO2。
They found that these states were always below the TiO2 conduction band, which means that hot electrons from the quantum dot can transfer from the PbSe to the TiO2.
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