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[하찬홍 Lectureship] Expanding our vision of molecular glasses: Physical vapor deposition prepares ultrastable ~

POSTED DATE : 2025-02-21
WRITER : 화학과
HIT : 1386

DATE : 2025년 3월 5일(수) 오후 4시 30분
PLACE : 330118호

2025년 3월 5일 오후 4시 30분 , 화학관 1층 330118호실에서 세미나가 개최됩니다.

많은 참여 부탁드립니다.

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- 제목 : Expanding our vision of molecular glasses: Physical vapor deposition prepares ultrastable and anisotropic materials

- 연사 : Prof. Mark Ediger(University of Wisconsin-Madison)

- 일시 : 2025년 3월 5일(수) 오후 4시 30분

- 장소 : 화학관 1층 330118호실

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Expanding our vision of molecular glasses: Physical vapor deposition prepares ultrastable and anisotropic materials

Mark Ediger

University of Wisconsin-Madison

Glasses are non-equilibrium materials and a vast array of amorphous structures are possible in principle. However, glasses are generally regarded as disordered and the idea of “controlling” molecular packing in glasses is reasonably met with skepticism. We have shown that physical vapor deposition (PVD) produces glasses with properties that cannot be achieved by other preparation routes, including high stability and controlled anisotropy. The exotic properties of PVD glasses can be explained by a surface equilibration mechanism: mobility near the free surface allows substantial equilibration during deposition, even well below the conventional T_g. Our work with organic glasses has now been extended to show aspects of ultrastability in polymeric, metallic, and chalcogenide glasses.

The major application of organic glasses is the production of commercial OLEDs, where PVD is utilized to prepare glassy active layers of organic semiconductors. It has recently been shown that ultrastable glasses of organic semiconductors make longer-lasting OLEDs. In addition, the surface equilibration mechanism can be used to control the orientation of emitter molecules, to produce more efficient OLEDs. OLED production often utilizes co-deposition. We have recently shown that co-deposition of two organic semiconductors can produce a homogeneous ultrastable glass but, in other systems, component separation occurs in the plane of the sample, on a controllable length scale.

* 졸업논문 교과목 수강자 세미나 필수 참석 안내
석사, 석박통합, 박사과정이 수강하는 <졸업논문연구학점 1~6>수강자는 학과에서 개최하는 목요일 정규세미나에 반드시 참석해야함.

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[하찬홍 Lectureship] Expanding our vision of molecular glasses: Physical vapor deposition prepares ultrastable ~