Formation and Decay of Exciplexes between Polycyclic Aromatic Hydrocarbons and N,N-dimethylaniline
- Author(s)
- Ena Yun
- Type
- Thesis
- Degree
- Master
- Department
- 대학원 화학과
- Advisor
- Lee, Hohjai
- Abstract
- Exciplex is an emissive charge-transfer complex, formed by photo-induced electron transfer (PET) from a ground state donor (D) to photon-excited acceptor (A*). Due to its radiative properties, exciplex has been widely studied for PET mechanism and the development of organic light-emitting diode (OLED).
In this work, I aimed to investigate how the optical properties of exciplex depend on electron acceptors. I performed steady and time-resolved spectroscopic studies with a series of polycyclic aromatic hydrocarbons (PAHs), anthracene, pyrene, perylene, and tetracene as electron acceptors with N,N-dimethylaniline (DMA) as a fixed electron donor since they are well-known A/D pairs to form the exciplex.
To understand the exciplex emission, I focused on two parts : exciplex formation and its radiative decay, which can be quantitatively expressed by the efficiency of exciplex formation (Φ(Exciplex,F(AD))) and its radiative decay (Φ(Exciplex→GS,R(AD))). I set up a 3-level kinetic model and obtained Φ(Exciplex,F(AD)) and Φ(Exciplex→GS,R(AD)). Furthermore, for the exciplex formation, thermodynamic driving force of PET and quenching rate constants of each A* by D were experimentally determined. The results suggest that the large driving force (about 0.5 eV), coupled with the long decay time of A*, causes high Φ(Exciplex,F(AD)). For the exciplex decay, we performed quantum-mechanical calculations to discuss the charge distribution, oscillator strength of exciplex. The results suggest that the strong correlation between radiative decay efficiency of exciplex, Φ(Exciplex→GS,R(AD)), and computationally calculated oscillator strength (fExE). This study will provide details about the radiative decay properties of exciplex formed between various PAHs and DMA.
- URI
- https://scholar.gist.ac.kr/handle/local/19310
- Fulltext
- http://gist.dcollection.net/common/orgView/200000884049
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