Electrochemical Depositon of End-Capped Triarylamine and CBP Dendrimers: Alternate Technique for the Fabrication of Orga
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0965-S03-19
Electrochemical Depositon of End-Capped Triarylamine and CBP Dendrimers: Alternate Technique for the Fabrication of Organic Light-Emitting Devices Ho-Jin Son1, Won-Sik Han1, Ji-Yun Chun1, Kyung Ryang Wee1, Dae Hyun Kim1, Kuk-Wha Lee2, Ha Jin Jung2, Chongmok Lee2, Jaejung Ko1, and Sang Ook Kang1 1 Advanced Material Chemistry, Korea University, 208 Seochang, Jochiwon, 339-700, Korea, Republic of 2 Department of Chemistry, Ewha Womans University, 11-1 Daehyun-dong, Seoul, 120-750, Korea, Republic of
ABSTRACT End-capped triarylamine and carbazole dendrimers were prepared through the divergent synthesis based on the reaction of diethenyl propagating carbosilane dendrimers with suitable functional groups such as the naphthylphenylaminophenyl (NPB) or carbazolylphenyl (CBP) unit. The electrochemical deposition behavior in higher generation dendrimer was observed in cyclovoltammetric experiments, leading to the good film formation on ITO. The deposited films remained intact in the depositing solvent and the film thickness was adjusted by varying the number of CV cycles. To obtain the reason of this behavior, the electrochemical property of compounds based on silicon (Me4-nSi(CBP)n) was systematically studied. Moreover, multi-layer films could be fabricated without causing any damage to the previous layer. To this ends, the fabrication of OLEDs using this electrochemical deposition process was also investigated.
INTRODUCTION Dendritic molecules have been proposed as alternative materials for convenient solution processing. The sphere-like rigid structures of these molecules enable the easy fabrication of homogenous films by casting [1]. In addition, dendrimeric precursors exhibit properties that are desirable for OLED applications, such as amorphous structure, high moldability, and high thermal stability [2]. Recently, we found that carbosilane dendrimers adorned with either triarylamine or carbazole units in their periphery exhibit novel electrochemical behavior in which the electrochemical deposition is controlled by dendrite generation. In addition, the deposited layers remained intact in the depositing solvent, methylene chloride, allowing a second layer to be deposited on top of the first layer. In the present study, we sought to establish the suitability of this electrochemical deposition technique for use in the construction of multi-layer OLEDs, which cannot be fabricated via conventional spin-coating with a polymeric precursor. Thus, the electrochemical deposition-based process could potentially offer an ideal combination of deposition control on the one hand and multi-layer fabrication on the other. We report herein the novel electrochemical deposition behavior of triarylamine or carbazole end-capped carbosilane dendrimers of the type Gn-2n+1NPB or Gn-2n+1CBP and their use for the formation of multilayer structures of the type used in OLEDs’.
2 uA 10 uA
ITO
Electrodeposition
ITO
Film Formation
ITO
Figure 1. Electrochemical deposition of G3-16NPB and G3-16CBP Dendrimers
DISCUSSION The electro
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