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Research Team from Department of Physics and Chemical Engineering and Materials Science at Ewha Suggests a Strategy ...
Research Team from Department of Physics and Chemical Engineering and Materials Science at Ewha Suggests a Strategy to Enable Exciton Funneling and Boost Visible Light Emission in 2D Inorganic Semiconductors A joint research team at Ewha reports rapid transfer of photogenerated excitons and enhanced light emission from 2D inorganic semiconductors integrated with blue-fluorescent organic molecules. The results of the study, which highlights a strategy to develop a new type of optoelectronic devices, were published in the online edition of Advanced Science (IF: 16.806), a world-renowned academic journal within the top 4.4% in the field of materials science, on June 16 (Thu.). (from left) Prof. Youngmin You, Prof. Dong-Wook Kim, Dr. Soyeong Kwon The team led by Professors Dong-Wook Kim at the Department of Physics and Youngmin You at the Department of Chemical Engineering and Materials Science confirmed the enhancement of luminescence due to exciton transfers in heterostructure interfaces comprised of two-dimensional semiconductor transition metal dichalcogenides (TMD) and fluorescent organic molecules. Professor Kim fabricated heterostructures by stacking evaporated thin films of DY1 fluorescent molecules on TMD MoS2 monolayers. The DY1 fluorescent molecules used in the process were obtained by the team led by Prof. You during the team’s OLED development researches. Optical characterizations and probe-based surface charge distribution measurements revealed exciton transfer from DY1 molecules to the MoS2 monolayers, which led to 1.7-fold enhanced light emission from MoS2. It has been reported that charge transfer rather than exciton transfer is dominant at the interfaces of different TMD materials. This work successfully demonstrated exciton transfers in the hybrid heterostructures by stacking fluorescent organic molecules on TMDs. The team could also propose a way to identify the transfer process of charges and excitons, based on the complementary use of measuring optical properties and analyzing scanning probe microscopes. (Left) A schematic diagram to illustrate the transfer of excitons generated from DY1, a self-developed fluorescent organic molecule, to an adjacent two-dimensional semiconductor MoS2 monolayer. (Right) Enhanced light emission characteristics and extension of exciton lifetime of the DY1/MoS2 hybrid heterostructure (small figure). Dr. Soyeong Kwon at the Department of Physics remarked as the first author of the paper, “Given the various trials and errors as well as numerous difficulties that I went through while studying the novel research subject of organic and inorganic heterostructures over the last two years of my Ph.D. course, I feel an even deeper sense of satisfaction and fulfillment. I also hope that our findings will be followed by many follow-up studies.” The paper, titled “Exciton Transfer at Heterointerfaces of MoS2 Monolayers and Fluorescent Molecular Aggregates,” was conducted through collaborative research by the Department of Physics at Ewha (Professor Seokhyun Yoon and Taeyoung Choi), the Institute of Basic Science at Sungkyunkwan University (Professor Ji-Hee Kim and Ki Kang Kim), and the Department of Physics at Chungnam National University (Professor Ki-ju Yee), with support from the National Research Foundation of Korea and the Institute for Basic Science. Professors Dong-Wook Kim and Youngmin You, the corresponding authors of this paper, are supported by the Basic Research Laboratory grant.
Ewha Confers Honorary Doctoral Degree on Solvay CEO, Ilham Kadri
Ewha Confers Honorary Doctoral Degree on Solvay CEO, Ilham Kadri Ewha Womans University conferred an honorary doctoral degree in women’s studies on Dr. Ilham Kadri, CEO of global chemicals company Solvay, at the Lee Sam-bong Hall of the ECC building on June 20 (Mon.) at 10:00 a.m. Explaining the reason for the honorary doctoral degree, President Eun Mee Kim remarked, “We are hereby recognizing Dr. Ilham Kadri’s lifelong dedication to the empowerment and growth of women in the field of science as well as in business management as the CEO of one of the world’s top chemicals companies.” Born in Morocco in 1969, Dr. Ilham Kadri studied chemical engineering at L'École des Hauts Polymères de Strasbourg in France and received a doctorate in macromolecular physical chemistry at Louis Pasteur University in France. She is the first female CEO at Solvay, a world-leading chemicals company based in Belgium with a history of around 160 years. The conferment ceremony was attended by more than 200 people, including President Eun Mee Kim, former president Kim Sun-Uk, other key faculty members and staff, and members of Solvay and the Belgian government, as well as recipients of the Solvay Scholarship. The ceremony was held in the order of a prayer, a recommendation speech, the conferment of the honorary doctorate degree, a celebratory performance, and the honorary degree acceptance speech. Professor Han You-kyung, Dean of the Ewha Graduate School, remarked in her recommendation speech, “Dr. Ilham Kadri has actively advocated for the values of inclusion and diversity in various fields and dedicated herself to mentoring and teaching young women, with a special focus on the improvement of women’s education in the areas of science, technology, engineering, and math (STEM),” and explained the significance of the award by saying, “Dr. Ilham Kadri’s efforts are in line with the vision of Ewha, which was established 136 years ago based on the spirit of Christianity to build a better world for all.” In the acceptance speech, Dr. Ilham Kadri responded to the recommendation speech by remarking, “I feel very honored and humbled today to be awarded an honorary doctoral degree from Ewha Womans University. I would be the happiest woman in the world to know that there is even one little girl out there who is inspired by the career choices that I’ve made,” and further emphasized, “I am deeply grateful to receive this recognition from a university that contributes so heavily to the education of women leaders in STEM fields, and I am convinced that a partnership with Ewha will be the key to building a more diverse talent pipeline.” Through the conferment of an honorary doctoral degree on Dr. Ilham Kadri, Ewha and Solvay are expected to further strengthen their partnership. Ewha is the first and only university in Korea to have formed a university-industry partnership with Solvay, having established the partnership in 2011. In order to train promising women scientists, Solvay has been offering the Solvay Scholarship to outstanding graduate science and engineering students at Ewha since 2012. To date, 47 students have been provided with scholarships worth around KRW 2 billion in total. Ewha also established the Ewha-Solvay Research & Innovation Center in 2014 as part of the joint research infrastructure and has been strengthening academic ties with Solvay through a mutually-beneficial research partnership.
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