The Influence of the Phase Morphology on the Optoelectronic Properties of Light-Emitting Electrochemical Cells

Franz P. Wenzl; Peter Pachler; Christian Suess; Anja Haase; Emil J. W. List; Peter Poelt; Dieter Somitsch; Peter Knoll; Ullrich Scherf; Gunther Leising

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The Influence of the Phase Morphology on the Optoelectronic Properties of Light-Emitting Electrochemical Cells

机译：相形态对发光电化学电池光电性能的影响

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We report on the morphological aspects of thin films prepared from a blue-green light-emitting conjugated polymer, (methyl-substituted ladder-type poly(p-phenylene, mLPPP)), blended with a solid-state electrolyte composed either by a crown ether, dicyclohexano-18-crown-6 (DCH18C6), or a high-molecular-weight poly(ethylene oxide) (HMWPEO), and a Li salt, lithium trifluoromethanesulfonate (LiCF_3SO_3, Li triflate (LiTf)), as they have been successfully applied in light-emitting electrochemical cells (LECs). The surface morphologies of the blend layers were investigated using atomic force microscopy (AFM) in tapping mode, and the ion distribution was probed using X-ray analysis by means of energy-dispersive X-ray spectrometry (EDXS) in the scanning electron microscope (SEM). We show that the two different phase-separation processes, the complexation tendencies of the ionic species as well as the ionic transport numbers, have tremendous influence on the performances of the corresponding LECs, revealing either rectifying or symmetric optoelectronic characteristics in forward and reverse bias directions. This opens up new possibilities for tuning the optoelectronic properties of ion-supported organic electronic devices.

机译：我们报告了由蓝绿色发光共轭聚合物（甲基取代的梯型聚（对亚苯基，mLPPP））与由冠部组成的固态电解质混合制备的薄膜的形貌方面醚，二环己基18冠冕6（DCH18C6）或高分子量聚环氧乙烷（HMWPEO）和锂盐三氟甲磺酸锂（LiCF_3SO_3，三氟甲磺酸锂（LiTf））成功应用于发光电化学电池（LEC）。使用原子力显微镜（AFM）在敲击模式下研究共混层的表面形态，并使用X射线分析通过能量色散X射线光谱法（EDXS）在扫描电子显微镜中探测离子分布（ SEM）。我们表明，两种不同的相分离过程，离子种类的络合趋势以及离子迁移数对相应LEC的性能产生巨大影响，揭示了正向和反向偏置方向的整流或对称光电特性。这为调节离子支撑的有机电子器件的光电性能开辟了新的可能性。

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来源
《Advanced Functional Materials》 |2004年第5期|p. 441-450|共10页
作者
Franz P. Wenzl; Peter Pachler; Christian Suess; Anja Haase; Emil J. W. List; Peter Poelt; Dieter Somitsch; Peter Knoll; Ullrich Scherf; Gunther Leising;
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Institut für Festkorperphysik, TU-Graz, Petersgasse 16, A-8010 Graz, Austria;

Institut für Festkorperphysik, TU-Graz, Petersgasse 16, A-8010 Graz, Austria;

Institut für Nanostrukturierte Materialien und Photonik, Joanneum Research GmbH, Franz-Pichler-Strasse 30, A-8160 Wiez, Austria;

Institut für Nanostrukturierte Materialien und Photonik, Joanneum Research GmbH, Franz-Pichler-Strasse 30, A-8160 Wiez, Austria;

Institut für Nanostrukturierte Materialien und Photonik, Joanneum Research GmbH, Franz-Pichler-Strasse 30, A-8160 Wiez, Austria;

Forschungsinstitut für Elektronenmikroskopie, TU-Graz, Steyrergasse 17, A-8010 Graz, Austria;

Institut für Experimentalphysik, Karl-Franzens-Universitat Graz, Universitatsplatz 5, A-8010 Graz, Austria;

Institut für Experimentalphysik, Karl-Franzens-Universitat Graz, Universitatsplatz 5, A-8010 Graz, Austria;

Makromolekulare Chemie, Bergische Universitat Wuppertal, Gauss-Str. 20, D-42097 Wuppertal, Germany;

Science and Technology, AT&S AG, Fabrikgasse 13, A-8700 Hinterberg, Leoben, Austria;

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中图分类无线电电子学、电信技术;
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The Influence of the Phase Morphology on the Optoelectronic Properties of Light-Emitting Electrochemical Cells

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