Funneling and Enhancing Upconversion Emission by Light-Harvesting Molecular Wires
收藏科学数据银行2022-07-21 更新2026-04-23 收录
下载链接：
https://www.scidb.cn/detail?dataSetId=528ba1db9f8146959b49bc9a4677a5af
下载链接
链接失效反馈官方服务：
资源简介：
Triplet-triplet annihilation (TTA) upconversion has shown promising potentials in the augmentation of solar energy conversion. However, challenging issues exist in improving TTA upconversion efficiencies in solid-states, one of which is the back energy transfer from upconverted singlet annihilators to sensitizers resulting in decreasing upconversion emission. Here we present a light-harvesting molecular wire consisting of dendrons with 9,10-diphenylanthracene derivatives (DPAEH) at the periphery and para-phenylene ethynylene oligomers (PPE) as the wire core. The peripheral DPAEH antenna funnels singlet excitonic energy to the wire on a 12 ps timescale. Incorporating the molecular wire into the TTA upconversion solid consisting of the DPAEH annihilator and the porphyrin sensitizer evidently improves the upconversion quantum yield from 1.5% to 2.7% upon 532 nm excitation by suppressing the back energy transfer from the singlet annihilator to the sensitizer. This finding offers a potential route to use singlet energy light-harvesting architecture for enhancing TTA upconversion.
提供机构：
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; Guiwen Luo
创建时间：
2022-07-19
