The bent bond states mainly appear near the top of valence band.

弯键态主要出现在价带顶附近。

In the band structure, one band that is completely filled with electrons is termed valence band.

在能带结构中, 完全填满电子的带被称为价带.

Note that all energy levels in the valence band are empty.

热能量和外加电场不能够提高在价带中最上层电子到导带.

The reason is that their valence band is full of electrons, which obstructs current flow.

因为它们的价带填满了电子, 使电流无法流动.

The blue luminescence is due to the electrons transition from the shallow donor levels of oxygen vacancies to the valence band.

文中对此蓝光发射的形成机制进行了讨论，根据晶体中的缺陷分析认为这是氧空位到价带的电子跃迁形成的。

The upshift of valence band edge and the downshift of conduction band edge under tensile strain are responsible for that.

这是因为外加伸展应力使得矽的价电带往上移动以及导电带向下移动造成。