CdSe纳米棒内部激子跃迁的皮秒动力学
Picosecond Dynamics of Internal Exciton Transitions in CdSe Nanorods
摘要：
利用超宽带太赫兹光谱技术，通过胶体CdSe纳米棒的类1 s到2 p的内部跃迁，直接测量了胶体CdSe纳米棒中激子的皮秒动力学。在8.5和11 THz处分别观察到纵向和横向态的加宽吸收峰。激子-LO声子耦合的开始表现为在LO声子能量处的光学电导率谱中的漂白，在激发后时间> 1 ps。模拟结果表明，由于热激发的空穴态被迅速捕获到配体或未钝化的表面状态，抑制激子温度。的弛豫动力学的操纵和纵向过渡淬灭的表面配体交换与空穴捕获吡啶。
英文摘要：
The picosecond dynamics of excitons in colloidal CdSe nanorods are directly measured via their 1s to 2p-like internal transitions by ultra-broadband terahertz spectroscopy. Broadened absorption peaks from both the longitudinal and transverse states are observed at 8.5 and 11 THz, respectively. The onset of exciton-LO phonon coupling appears as a bleach in the optical conductivity spectra at the LO phonon energy for times > 1 ps after excitation. Simulations show a suppressed exciton temperature due to thermally excited hole states being rapidly captured onto ligands or unpassivated surface states. The relaxation kinetics are manipulated and the longitudinal transition is quenched by surface ligand exchange with hole capturing pyridine.
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