|Speaker||Prof. Dongwook-kim (Kyonggi University)|
|Date||Thu. 2 May. 2019|
|Venue||#331, Asan Hall, College of Science|
Theoretical studies of organic molecules in OLEDs:
From chemical stability to the excited-state nature
Since their first invention, the performance of organic light emitting diodes (OLEDs) have tremendously been improved for last three decades. In such a long journey, theoretical and computational studies have provided fundamental insights into various optical/physical /chemical phenomena in the devices and suggested the design rules of new efficient organic semiconducting materials to improve the device performance. Among many such studies, for example, in the case of thermally activated delayed fluorescence (TADF) phenomenon, which enables a full harvest of triplet excitons with organic emitters, our recent theoretical studies have unveiled the true nature of the singlet and triplet energy difference,1-2 and the role of different excited-nature between such states in the intersystem crossing.3 In addition, the role of multiple donor or acceptor units in enhancing the intersystem crossing rate and fluorescence rate was recently addressed.4 We recently also investigated the chemical stabilities of organic semiconducting materials in a combination of electron donor and acceptor units, pertaining to the device lifetime.5-6 In this talk, I would like to briefly discuss the chemical stabilities and excited-state natures of organic semiconducting materials in OLEDs.
1. D. Kim, J. Phys. Chem. C 2015, 119, 12690.
2. K. Lee and D. Kim, J. Phys. Chem. C 2016, 120, 28330.
3. P.K. Samanta, D. Kim, V. Coropceanu and J.-L. Bredas, J. Am. Chem. Soc. 2017, 139, 4042.
4. C. Ahn and D. Kim, submitted.
5. H. Li et. al. Chem. Mater. 2019, 31, 1507
6. D. Kim, submitted.
|Notice||Spring semester 2019 Seminar Schedule||-||-|
|63||[May 23. 2019] Molecular Engineering for Organic Electronics and Synchrotron X-rays||Prof. Hyojung Kim (Pusan National University)||Thu. 23 May. 2019|
|62||[May 16. 2019] Nano Structure Analysis by Synchrotron Small Angle X-ray Scattering Technique||Dr. Hyungjoo-An (Pohang Accelerator Laboratory)||Thu. 16 May. 2019|
|61||[May 9. 2019] Chemistry in Molecular Vessels||Prof. Partha Sarathi Mukherjee||Thu. 9 May. 2019|
|»||[May 2. 2019] Theoretical studies of organic molecules in OLEDs: From chemical stability to the excited-state nature||Prof. Dongwook-kim (Kyonggi University)||Thu. 2 May. 2019|
|59||[April 25. 2019] Colorful World of Quantum Dots||Prof. Sungjee Kim (Pohang University of Science & Technology)||Thu. 25 Apr. 2019|
|58||[April 4. 2019] Rational Design of Solid-State Materials with Asymmetric Coordination Environment||Prof. Kang Min Ok (Sogang University)||Thu. 4 Apr. 2019|
|57||[March 28. 2019] NMR Structural Studies of engineered novel antimicrobial peptides||Prof. Yongae Kim (Hankuk University of Foreign Studies)||Thu. 28 Mar. 2019|
|56||[March 21, 2019] Nanomaterials Design for Energy Conversion and Storage||Prof. Jong-Hyuk Park (Yonsei University)||Thu. 21 Mar. 2019|
|55||[March 27, 2019] Hyperpolarization Researches with NV center, 129Xe and Parahydrogen||Prof. Keunhong Jeong||March 27, 2019|
|54||[March 20, 2019] Challenges in molecular dynamics simulations of unfolded proteins and protein-DNA complexes||Dr. Jejoong Yoo||March 20, 2019|
|53||[March 5. 2019] Innovation@Agilent||Dr. Darlene Solomon (Agilent Technologies Inc.)||Tuesday. 5 March. 2019|
|52||[March 5. 2019] Prof. Michael J. Sailor/Treatment of S. aureus Bacterial Infections with Porous Silicon Nanoparticles||Prof. Michael J. Sailor (UC San Diego)||Tuesday. 5 March. 2019|
|51||[Thu. 6 Dec. 2018] Prof. Dong-Ho Kim/Department of Chemistry, Yonsei University, Seoul, Korea||Prof. Dong-Ho Kim (Yonsei University)||Thu. 6 Dec. 2018|
|50||Fall semester 2018 Seminar Schedule||-||-|
|49||[January 24, 2018] Electro-Optic Organic THz Wave Sources||Prof. O-Pil Kwon(Ajou University)||January 24, 2018 (Wednesday)|
|48||[Thu. 30 Nov. 2017] Prof. Sunmin Ryu/Department of Chemistry, POSTECH, Pohang, South Korea||Prof. Sunmin Ryu||Thu. 30 Nov. 2017|
|47||[Thu. 23 Nov. 2017] Prof. Sung-Gon Kim/Department of Chemistry, Kyonggi University, Suwon, Korea||Prof. Sung-Gon Kim||Thu. 23 Nov. 2017|
|46||[November 14, 2017] Zero-Point Energy, Fluctuations, and Dissipation : A (Mostly) Quantum-Optical Perspective||Prof. Milonni, Peter||November 14, 2017|
|45||[Thu. 16 Nov. 2017] Prof. Hyungjun Kim/Department of Chemistry, and Graduate school of Energy, Environment, Water, and Sustainability (EEWS), KAIST, Daejeon, Korea||Prof. Hyungjun Kim||Thu. 16 Nov. 2017|
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