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

• DOI: 10.1021/acs.jpclett.6b00761
• Publication Date: 2016-05-10T19:39:55Z
• Authors: Xin Li; Zhiyuan Huang; Ramsha Zavala; Ming Lee Tang
• Keywords: Anthracenes; Energy Transfer; Surface Properties; Cadmium Compounds; Nanoparticles; 02 engineering and technology; Selenium Compounds; 0210 nano-technology; 7. Clean energy

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 saturated 9,10-diphenylanthracene hexane solutions under air-free conditions at room temperature provided the steady-state rate of TET (ket) this interface. For flexible transmitters, ket is similar for different lengths bridges, suggesting that ligands bend backward. rigid phenylene spacer, sensitization anthracene transmitter molecules by NCs shows strong distance dependence, with Dexter damping coefficient 0.43 ± 0.07 Å–1. The bound closest to NC surface gave highest quantum yield 14.3% conversion green violet light, current record platform.