Pressure induced phase transitions of bulk CsGeCl and ultrafast laser pulse induced excited-state properties of CsGeCl quantum dots.

First-principles calculations are carried out to investigate the structural, electronic, and optical properties of CsGeCl. The results indicate that CsGeCl undergoes three structural phase transitions from or 3 to 3̄ at 8.5 GPa, from 3̄ to ppPv- at 9.