Synthesis and Application of Ion Sensor based on Terfluorene Chromophore
Date Issued
2007
Date
2007
Author(s)
Tsai, Wang-Chang
DOI
zh-TW
Abstract
A series of novel materials which contain terfluorene as a backbone and crown ether(s) as pendant substitution(s) have been synthesized in this thesis. The structures of these materials are shown as below:
The crown ether is capable of binding to various cations, allowing these new materials to serve as ion-selective chemosensors. The terfluorene derivatives incorporated with aza-18-crown-6 (TA6) have weak fluorescence due to photoinduced electron transfer (PET) process. After treating TA6 with various cations, the PET process was strongly blocked, leading to a distinct change in fluorescence emission (from weak green to strong blue). From titration experiments, TA6 was found to have excellent selectivity to Hg(Ⅱ), Pb(Ⅱ), and Fe(Ⅱ). The fluorescence intensity enhanced 40-folds after treating with these three cations. This study shows that TA6 can be a prototype of sensor for sensing toxic cation such as Hg(Ⅱ) and Pb(Ⅱ) in biosystem and environment. The bifunctional materials which have terfluorene for charge carriers transporting and crown ether for ions transporting can be applied in light-emitting electrochemical devices. The LEC (Light-emitting Electrochemical Cell) devices were fabricated by spin coating of the terfluorene derivatives and electrolytes. The EQE (external quantum efficiency) of TB5 and T3B5 devices can reach up to 0.25 % and 0.56 %, respectively. By adding appropriate amount of NaPF6 to the thin films of T3B5, the device shows higher efficiency (0.63 %) and longer lifetime.
Subjects
三芴
感測器
冠醚
電子轉移
寡聚物
crown ether
terfluorene
PET
LEC
oligomer
Type
thesis
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