Tunable dual emission of fluorescence-phosphorescence at room temperature based on pure organic supramolecular gels
发布时间：2021-03-01
浏览人次：2125
来源：湖北省地质实验测试中心
摘要：A facile fabrication strategy of fluorescence-phosphorescence dual emissive materials based on the supramo_x005f_x005f_x0002_lecular gels was proposed in this work. In comparison with complicated fabrication of conversional dual emissive
materials, supramolecular gels are formed just through a simple heating and cooling of solution containing a
gelator and phosphor. The gel system is pure organic without any metal ions. Herein, the self-assembly of gelator
N, N-dibenzoyl-L-cystine (DBC) resulted in the formation of gel system. The phosphor 3,5-Dibromoquinoline
(BrQ) entrapped in the gels endowed gels with fluorescence-phosphorescence dual emission. Upon 315 nm
UV irradiation, strong room temperature fluorescence and phosphorescence emission were observed at 367 and
550 nm, respectively. The ability of dual emission at room temperature could be attributed to the ordered
microstructure of the supramolecular gels, effectively avoiding the non-radiative transition of BrQ. In addition,
the gel system exhibited environmental responsiveness including thermal, pH and redox response due to the
structural feature of DBC gels. The dual emission can be tuned by this responsiveness. Particularly, the deoxygenation of gel system is not required. Conversely, the dissolved oxygen in the system can be employed for redox
materials, supramolecular gels are formed just through a simple heating and cooling of solution containing a
gelator and phosphor. The gel system is pure organic without any metal ions. Herein, the self-assembly of gelator
N, N-dibenzoyl-L-cystine (DBC) resulted in the formation of gel system. The phosphor 3,5-Dibromoquinoline
(BrQ) entrapped in the gels endowed gels with fluorescence-phosphorescence dual emission. Upon 315 nm
UV irradiation, strong room temperature fluorescence and phosphorescence emission were observed at 367 and
550 nm, respectively. The ability of dual emission at room temperature could be attributed to the ordered
microstructure of the supramolecular gels, effectively avoiding the non-radiative transition of BrQ. In addition,
the gel system exhibited environmental responsiveness including thermal, pH and redox response due to the
structural feature of DBC gels. The dual emission can be tuned by this responsiveness. Particularly, the deoxygenation of gel system is not required. Conversely, the dissolved oxygen in the system can be employed for redox
reaction without the addition of any other oxidant.
关键词:Supramolecular gels,Dual emission,Roomtemperature, phosphorescence, Fluorescence
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