|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||-||-|
|68||Fall semester 2016 Seminar Schedule||-||-|
|67||Spring semester 2017 Seminar Schedule||-||-|
|66||[Fri. 17 Mar. 2017] 9th RINS Symposium||-||Fri. 17 Mar. 2017|
|65||[Thu. 27 Apr. 2017] Seminar was canceled!||-||-|
|64||[Wed. 5 July. 2017] Seminar is canceled!||-||-|
|63||7th Jilin-Korea-Waseda Alliance Annual Symposium||-||August 17 ~ 19, 2017|
|62||Fall semester 2017 Seminar Schedule||-||-|
|61||Fall semester 2018 Seminar Schedule||-||-|
|60||[October 10, 2017] Novel Terahertz Spectroscopies||Director Mischa Bonn||Tue, October 10, 2017|
|59||[August 14. 2019] Principle of Semiconductor Quantum Cascade Laser and It’s Application to Chemical Gas Detection||Dr. Byeong-il Seo(Agency for Defense Development)||Wed. 14 August. 2019|
|58||[October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences||Dr. Byung-Kuk Yoo||October 25, 2017|
|57||[March 5. 2019] Innovation@Agilent||Dr. Darlene Solomon (Agilent Technologies Inc.)||Tuesday. 5 March. 2019|
|56||[May 16. 2019] Nano Structure Analysis by Synchrotron Small Angle X-ray Scattering Technique||Dr. Hyungjoo-An (Pohang Accelerator Laboratory)||Thu. 16 May. 2019|
|55||[Fri. 13 Oct. 2017] Dr. J. Nathan Hohman/The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA||Dr. J. Nathan Hohman||Fri. 13 Oct. 2017|
|54||[March 20, 2019] Challenges in molecular dynamics simulations of unfolded proteins and protein-DNA complexes||Dr. Jejoong Yoo||March 20, 2019|
|53||[Thu. 26 Oct. 2017] Dr. Jung-Nyoung Heo/Center for Medicinal Chemistry Research, Korea Research Institute of Chemical Technology, Daejeon, Korea||Dr. Jung-Nyoung Heo||Thu. 26 Oct. 2017|
|52||[October 15. 2019] A more sustainable chemistry with elemental sulfur||Dr. Thanh Binh Nguyen(Institut of Natural Product Chemistry)||Tue. 15 October. 2019|
|51||[Thu. 13 Apr. 2017] Dr. Wan Ki Bae/Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul, Korea||Dr. Wan Ki Bae||Thu. 13 Apr. 2017|
|50||[Mon. 13 Oct. 2016] Prof. Amir H. Hoveyda/Multicomponent Catalytic Synthesis of Organoboron Compounds for Scalable Natural Product Synthesis||Prof. Amir H. Hoveyda||Monday 13 October 2016|
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