Ultrafast intramolecular energy transfer in a nanostructured organosilicon luminophore based on <i>p</i>-terphenyl and 1,4-bis(5-phenyloxazol-2-yl)benzene
作者:Sergey A. Ponomarenko、Nikolay M. Surin、Maxim S. Skorotetcky、Oleg V. Borshchev、Sergey A. Pisarev、Evgenia A. Svidchenko、Yuriy V. Fedorov、Francesc Molins、Tobias Brixner
DOI:10.1039/c9tc04472h
日期:——
constant of the energy transfer from donor to acceptor luminophores within the NOL is τ1 = 105 fs, which is significantly faster than the vibrational relaxation within the donor (ca. 400 fs). Based on these findings, a kinetic scheme of the electronic excitation energy deactivation processes in the NOL was developed. The results obtained not only directly prove that the mechanism of energy transfer within
我们报告了对新型高发光材料–纳米结构有机硅发光体(NOLs)的超快分子内能量转移的首次实验和理论研究。为此,我们设计,合成和研究了NOL,(POPOP)Si 2(3Ph-EH)6,它由六个对-叔苯基(3Ph)供体和1,4-双(5-苯基恶唑-2-基)苯组成(POPOP)受体发光体–众所周知的激光染料分别在塑料闪烁体中分别用作激活剂和光谱移动剂。NOL具有出色的光学性能–摩尔吸收系数高达2.6×10 5 L mol -1 cm -1,光致发光量子产率高达96%,伪斯托克斯位移为100 nm。由稳态光学测量确定的其分子内能量转移效率为93%,而激发寿命小于1 ns。为了更深入地了解NOL中分子内能量转移的过程,首次对此类化合物进行了NOL,模型供体和受体发光体的超快光谱研究。结果发现,从供体的能量转移到受体发光体的NOL内的时间常数为τ 1 = 105个飞秒,其显著比振动弛豫快是供体内(约400
Electron pin resonance studies of silicon- and germanium-substituted anion radicals