Optical properties of organic semiconductors

• Grant number: 12/10517-8
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: September 01, 2012
• End date: July 16, 2014
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Osvaldo Novais de Oliveira Junior
• Grantee: Paulo Alliprandini Filho
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

In this work we will study the optical properties of organic semiconductors, as well as energy transfer processes. To do so we shall utilize optical characterization techniques for semiconductors, such as emission ellipsometry, photoluminescence, polarized photoluminescence, photoluminescence excitation, absorption and polarized absorption. Understanding energy transfer mechanisms is important to develop materials for displays applications, optical storage and optical processing. In addition to studying the optical properties of semiconducting polymer films, we shall investigate the influence of film manufacturing processes on the polarization state of the emitted light. For this purpose, we shall use films from polymers such as poly(p-phenylene vinylene) (PPV), which can be stretched, deposited on surface-relief gratings, or as Langmuir-Blodgett films (LB). Among the main objectives, we intend to produce films that emit linearly and circularly polarized light, which is important for some applications. For optimizing film properties, we shall study in detail the charge and energy transfer processes, contrasting the results with theoretical models used in the literature. (AU)