Korea Institute of Science and Technology

He Seung Lee

Seung Sang Hwang

Kyung Youl Baek

Seung-Sock Choi

Sungyoun Oh

Soon Man Hong

Chong Min Koo

Albert S Lee

Soon Jong Kwak

Eun Kyeong Kim

A monomer composition for polymerizing a branch-type silsesquioxane polymer is disclosed. The monomer composition includes hydroxy-substituted cyclic siloxane in a solvent, and the hydroxy-substituted cyclic siloxane includes stereoisomers of cyclic siloxane of cis, trans, random and twist structures at controlled ratios. Also disclosed are a branch-type silsesquioxane polymer synthesized by polymerizing the monomer composition for polymerizing a branch-type silsesquioxane polymer, and a method for synthesizing the same. In accordance with the disclosure, the isomers can be isolated stably at desired ratios. The isolated isomers may be polymerized into polymers of various types. Since the polymers exhibit low dielectric property, they may be utilized as low dielectric materials.

Composition comprising a monomer for polymerizing branch-type silsesquioxane polymer, branch-type silsesquioxane polymer synthesized from the same and a method for synthesizing the same

A low-dielectric constant thin film prepared from a silsesquioxane polymer matrix as a precursor and a method for preparing the same which comprises preparing silsesquioxane sol by adding a stereoisomer of a multi reactive cyclosiloxane to an alkoxysilane are provided. The low-dielectric-constant thin film retains a stable film state even at a curing temperature of &#x2212;500&#xb0; C. without being decomposed, a very uniform surface property with a low surface modulus, and a superior coatability as to be coatable smoothly with no crack even with a thickness of 500 nm or larger.

Siloxane-based low dielectric constant thin films using cyclo-siloxane and a method for preparing the same

Disclosed is a light-emitting material including a polysilsesquioxane having a ladder structure with photoactive groups bonded to a siloxane backbone. In addition to superior heat resistance and mechanical property, the light-emitting material provides improved cotability and film property when prepared into a thin film. Further, it provides higher luminous efficiency than the existing organic-based light-emitting material.

Light-emitting material comprising photoactive group-bonded polysilsesquioxane having a ladder structure, thin film using the same and organic electronic device comprising the same

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Seoul, South Korea

He Seung Lee