Efficient Long‐Range Triplet Exciton Transport by Metal–Metal Interaction at Room Temperature
Qingyun Wan, Dian Li, Jiading Zou, Tengfei Yan, Ruidan Zhu, Ke Xiao, Shuai Yue, Xiaodong Cui, Yuxiang Weng, Chi‐Ming Che
Abstract
Abstract Efficient and long‐range exciton transport is critical for photosynthesis and opto‐electronic devices, and for triplet‐harvesting materials, triplet exciton diffusion length ( ) and coefficient ( ) are key parameters in determining their performances. Herein, we observed that Pt II and Pd II organometallic nanowires exhibit long‐range anisotropic triplet exciton L D of 5–7 μm along the M−M direction using direct photoluminescence (PL) imaging technique by low‐power continuous wave (CW) laser excitation. At room temperature, via a combined triplet–triplet annihilation (TTA) analysis and spatial PL imaging, an efficient triplet exciton diffusion was observed for the Pt II and Pd II nanowires with extended close M−M contact, while is absent in nanowires without close M−M contact. Two‐dimensional electronic spectroscopy (2DES) and calculations revealed a significant contribution of the delocalized 1/3 [dσ*(M−M)→π*] excited state during the exciton diffusion modulated by the M−M distance.