Patterning Organic Fluorescent Molecules with SAM Patterns
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Patterning Organic Fluorescent Molecules with SAM Patterns Qiong Wu,1 Juanyuan Hao,1 Shoulei Shi,1 Weifeng Wang,1 Nan Lu1,* 1
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin
University, Changchun, 130012, P. R. China E-mail: [email protected] ABSTRACT We report a low-cost and high-throughput method to fabricate large-area light emitting pattern via thermal evaporation of organic molecules on the patterned self-assembled monolayer of homogenous 3-aminopropyltrimethoxysilane. This method is based on the selective deposition of the organic light emitting molecules on the template of self-assembled monolayer (SAM), which is patterned with nanoimprinting lithography. The selectivity can be controlled by adjusting the design of the pattern, the storage duration and the substrate temperature. The deposition selectivity of the molecules may be caused by the different binding energy of the molecules with the SAM and the substrate surface. INTRODUCTION Organic light emitting molecules have been widely used in the field of light emitting diodes, displays and other optical device because of their low cost and wide applicability.[1, 2] For the fabrication of integrated organic electronic devices, it is important to pattern organic materials over large areas with high resolution. The conventional method for micropatterning smallmolecule films is based on shadow mask technology.[3] Unfortunately, this method meets its limitation in achieving high resolution patterns due to the shadow effects. Several alternative patterning methods have also been developed, such as photolithography, microcontact printing (μCP), organic vapor jet printing, cold welding, soft lithography, and nanosphere lithography. Template-directed aggregation or crystallization supplies an effective bottom-up strategy, which is widely used to build architectures of functional materials, such as organic semiconductor single crystals,[4] and semiconductor quantum dots (QDs).[5, 6] However, template-directed growth of organic materials in gas phase is rarely reported though it can avoid ambient contamination (water and oxygen), and be compatible with matured semiconductor processing technology. Recently, a method based on template-directed nucleation with organic molecular beam deposition under ultrahigh vacuum conditions has been demonstrated, which provides one strategy for growing material on specific locations.[7] In this method, the Au template was prepared with electron-beam lithography (EBL), which was time-consuming. To enhance the efficiency, Langmuir–Blodgett (LB) technique has been employed for constructing monolayer
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patterns for selective adsorption of organic molecules.[8] However, as one of the self-assembly technique, LB technique can not precisely control the monolayer patterns. In this work, the large area organic luminescent molecular patterns were fabricated based on Nanoimprint Lithography (NIL) technique, which is a low-cost and high-throughput method for creating high resolution features.[9-11]
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