光激发
超快激光光谱学
激子
材料科学
带隙
光谱学
热化
纳米颗粒
光电子学
声子
钙钛矿(结构)
吸收(声学)
超短脉冲
光子上转换
化学物理
化学
纳米技术
凝聚态物理
激发态
原子物理学
兴奋剂
光学
结晶学
物理
激光器
量子力学
复合材料
作者
Chengqiang Wang,Tao Song,Muyan Zhu,Pingyuan Yan,Zihan Wu,Heng Li,Haibin Zhao,Chuanxiang Sheng
摘要
CsPbBr3 nanoparticles with averaged size of 14 and 2.1 nm (named as 14 and 2 nmNP, respectively) are synthesized capping with the ligand of dodecylbenzene sulfonic acid (DBSA). Using ultrafast transient absorption spectroscopy, free carriers in 14 nmNP characterize with the slow thermalization (∼0.76 ps) and long carrier cooling time (∼1 ns), which could be due to the phonon bottleneck effect. On the other hand, excitons are major photoexcitations in 2 nmNP, presenting with fast thermalization (<100 fs) and short cooling time (∼50 ps); this effective energy dissipation in 2 nmNPs can be ascribed to the involvement of phonons in DBSA ligands. In both 14 and 2 nmNP, we find that the photoexcitation accumulation leads to an increase in the bandgap that can be understood by the Burstein–Moss band filling effect. These results provide insights into the intrinsic photophysics of CsPbBr3 perovskite nanocrystals with different confinement effects, supplying direct implications for optoelectronic applications.
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