A fluorene-based material containing triple azacrown ether groups: synthesis, characterization and application in chemosensors and electroluminescent devices
作者:Chia-Shing Wu、Ying-Ju Lin、Yun Chen
DOI:10.1039/c3ob42054j
日期:——
We design a novel multifunctional fluorene-based material containing triple azacrown ether (FTC) not only for application in aqueous solution as a chemosensor towards Fe3+ but also to enhance the electroluminescence of PLEDs using an environmentally stable aluminum cathode. The photo-physical and sensing properties were investigated by absorption and photoluminescence (PL) spectroscopy. The FTC exhibited specific selectivity and high sensitivity toward Fe3+, with the Stern–Volmer coefficients (Ksv) being 1.59 × 105 M−1 in a solvent mixture of tetrahydrofuran and water (THF–H2O = 9/1, v/v). The FTC maintained high selectivity toward Fe3+ in the presence of ten interfering metal cations. The HOMO and LUMO levels were estimated to be −5.88 eV and −2.88 eV, respectively. The FTC significantly enhances the emission performance of PLEDs [ITO/PEDOT:PSS/MEH-PPV/EIL/Al] when used as an electron injection layer (EIL), especially in the presence of metal carbonates. Particularly, the device using K2CO3 doped FTC as the electron-injection layer (EIL) exhibited significantly enhanced performance compared to the one without EIL. The performance was significantly enhanced to 11 630 cd m−2 and 1.47 cd A−1, respectively, from 230 cd m−2 and 0.03 cd A−1 of the non-FTC device. Current results indicate that multifunctional fluorene-based material FTC is a potential candidate for selective detection of Fe3+ and as an effective electron injection layer to enhance the performance of MEH-PPV.
我们设计了一种含有三氮杂冠醚的新型多功能的基于芴的材料(FTC),不仅可用于在水溶液中作为对Fe3+的化学传感器,还旨在利用环境稳定的铝阴极来增强PLED的发光性能。通过吸收光谱和光致发光光谱(PL)研究了其光物理和传感特性。FTC对Fe3+表现出特定的选择性和高灵敏度,在四氢呋喃和水(THF-H2O=9/1,v/v)的溶剂混合物中,Stern-Volmer系数(Ksv)为1.59×105 M−1。在存在十种干扰金属阳离子的情况下,FTC对Fe3+仍保持高选择性。HOMO和LUMO能级分别估算为−5.88 eV和−2.88 eV。当用作电子注入层(EIL)时,FTC显著增强了PLED[ITO/PEDOT:PSS/MEH-PPV/EIL/Al]的发光性能,尤其是在存在金属碳酸盐的情况下。特别地,使用K2CO3掺杂的FTC作为电子注入层(EIL)的器件与没有EIL的器件相比,性能显著提升。从非FTC器件的230 cd m−2和0.03 cd A−1分别显著提升至11,630 cd m−2和1.47 cd A−1。当前结果表明,多功能基于芴的材料FTC是有潜力的Fe3+选择性检测候选材料,并且作为有效的电子注入层可以增强MEH-PPV的性能。