White Electroluminescence by Supramolecular Control of Energy Transfer in Blends of Organic-Soluble Encapsulated Polyfluorenes
White Electroluminescence by Supramolecular Control of Energy Transfer in Blends of Organic-Soluble Encapsulated Polyfluorenes
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DOI：
10.1002/adfm.200901764
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发表时间：
2010-01-22
影响因子：
19
通讯作者：
Cacialli, Franco
中科院分区：
文献类型：
--
作者：
Brovelli, Sergio;Meinardi, Francesco;Cacialli, Franco
在这里，研究证明，通过将共轭链穿入官能化环糊精中，可以通过一种成分的非共价封装来强烈减少半导体聚合物共混物中的能量转移。这种大环在纳米尺度上控制具有相似排列的发色团的最小分子间距离，从而控制相关的能量转移速率，从而能够制造白光发光二极管（CIE坐标：x = 0.282，gamma = 0.336）。特别是，在基于聚芴衍生物的发蓝光、有机可溶性轮烷和发绿光的聚（9,9-二辛基芴-替代苯并噻二唑（F8BT））的二元混合物中实现了白色电致发光。通过原子力显微镜、荧光图谱、μ拉曼和荧光寿命显微镜进行形态和结构分析，以补充光学和电致发光表征，并能够更深入地了解新型混合物的特性。
Here, it is demonstrated that energy transfer in a blend of semiconducting polymers can be strongly reduced by non-covalent encapsulation of one constituent, ensured by threading of the conjugated strands into functionalized cyclodextrins. Such macrocycles control the minimum intermolecular distance of chromophores with similar alignment, at the nanoscale, and therefore the relevant energy transfer rates, thus enabling fabrication of white-light-emitting diodes (CIE coordinates: x = 0.282, gamma = 0.336). In particular, white electroluminescence in a binary blend of a blue-emitting, organic-soluble rotaxane based on a polyfluorene derivative and the green-emitting poly(9,9-dioctylfluorene-alt-benzothiadiazole (F8BT) is achieved. Morphological and structural analyses by atomic force microscopy, fluorescence mapping, mu-Raman, and fluorescence lifetime microscopy are used to complement optical and electroluminescence characterization, and to enable a deeper insight into the properties of the novel blend.