Energy Transfer Studies of Electron Donating Carbazole and Electron Accepting Perylene Dye Systems

Electron donating poly(2,7-carbazoles) are one of the most attractive materials emerged as p-type semiconductors for applications in photovoltaic devices in combination with relevant electron accepting systems. On the other hand, perylene dyes are known as versatile n-type building block materials for organic device architectures and supramolecular systems. These polymeric- or small molecule-based organic materials are very important concerning controlled and improved light emission is therefore a key issue and blending of fluorescent dye materials with conjugated polymers could enhance transfer of energy (excitation) from host to guest. In the present work, the electronic energy transfer between three different chromophoric materials of 2,7-carbazoles and perylene dyes were investigated. The carbazole compounds are considered as electron donors and perylene diimide is considered as electron accepting group. The energy transfer studies of three carbazole derivatives with perylene dye in three different kinds of varying polarity (CHCl3, 4.81; CH3CN, 37.5; CH3OH, 32.6) reveal that most efficiency is achieved for the three of the carbazoles in CHCl3. The critical transfer distances measured are in excellent agreement and in addition Stern-Volmer plots show efficient diffusion-controlled energy transfer in chloroform. Although there is no efficient nonradiative energy transfer in CH3CN and CH3OH, interesting charge transfer leading to electron transfer are evidenced from carbazole to perylene chromophore Keywords: Energy Transfer, Stern-Volmer, Carbazole, Perylene