Distance-Dependent Triplet Energy Transfer between CdSe Nanocrystals and Surface Bound Anthracene

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• 作者：Xin Li ; Zhiyuan Huang ; Ramsha Zavala ; Ming Lee Tang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：June 2, 2016
• 年：2016
• 卷：7
• 期：11
• 页码：1955-1959
• 全文大小：300K
• 年卷期：0
• ISSN：1948-7185

文摘

We investigate triplet energy transfer (TET) across variable-length aromatic oligo-p-phenylene and aliphatic bridges in a covalently linked CdSe nanocrystal (NC)–bridge–anthracene hybrid system. Photon upconversion measurements in saturated 9,10-diphenylanthracene hexane solutions under air-free conditions at room temperature provided the steady-state rate of TET (k_et) across this interface. For flexible transmitters, k_et is similar for different lengths of aliphatic bridges, suggesting that the ligands bend backward. For the rigid phenylene spacer, triplet sensitization of anthracene transmitter molecules by CdSe NCs shows a strong distance dependence, with a Dexter damping coefficient of 0.43 ± 0.07 Å^–1. The anthracene transmitter bound closest to the NC surface gave the highest quantum yield of 14.3% for the conversion of green to violet light, the current record for a hybrid platform.