An organic dye with very large Stokes-shift and broad tunability of fluorescence: Potential two-photon probe for bioimaging and ultra-sensitive solid-state gas sensor

作者：He, Tingchao; Wang, Yue; Tian, Xiaoqing; Gao, Yang; Zhao, Xin; Grimsdale, Andrew C.; Lin, Xiaodong^*; Sun, Handong^*

来源：Applied Physics Letters, 2016, 108(1): 011901.

DOI：10.1063/1.4939232

• TUNABLE PHOTOLUMINESCENCE
• DUAL-EMISSION
• POLYANILINE
• TIME

Light-emitting nonlinear optical molecules, especially those with large Stokes shifts and broad tunability of their emission wavelength, have attracted considerable attention for various applications including biomedical imaging and fluorescent sensors. However, most fluorescent chromophores have only limited potential for such applications due to small Stokes shifts, narrow tunability of fluorescence emissions, and small optical nonlinearity in highly polar solvents. In this work, we demonstrate that a two-photon absorbing stilbene chromophore exhibits a large two-photon absorption action cross-section (eta delta = 320GM) in dimethylsulfoxide (DMSO) and shows broad fluorescence tunability (125 nm) by manipulating the polarity of the surrounding medium. Importantly, a very large Stokes shift of up to 227 nm is achieved in DMSO. Thanks to these features, this chromophore can be utilized as a two-photon probe for bioimaging applications and in an ultrasensitive solid-state gas detector.

• 出版日期2016-1-4
• 单位南阳理工学院; 深圳大学