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Light-Matter Interaction in Organic and Low-Dimensional Semiconductors
Light-Matter Interaction in Organic and Low-Dimensional Semiconductors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105237
- ISBN
- 9798291567975
- DDC
- 530
- 저자명
- Zhao, Haonan.
- 서명/저자
- Light-Matter Interaction in Organic and Low-Dimensional Semiconductors
- 발행사항
- [Sl] : University of Michigan, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 170 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Forrest, Stephen R.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2025.
- 초록/해제
- 요약Organic and inorganic semiconductors have been active research fields over the past decades. Excitons, the excited states in semiconductors, have enabled various functional optoelectronic devices that fundamentally change human lives. For example, the application of organic light-emitting devices (OLEDs) has revolutionized modern display technologies, while devices such as photovoltaics, transistors and other informatic devices are set to bring a larger impact to the world. Meanwhile, light-matter interaction, from the Purcell effect in the weak coupling regime to the exciton-polariton in the strong coupling regime, endows new degrees of freedom to manipulation of excitons properties, such as energy levels, spin information and non-equilibrium dynamics. This thesis is focused on the understanding exciton-photon interactions, and their essential role in the intrinsic improvement of these optic and electronic devices.The first part of this thesis studies the phosphorescent OLED (PHOLED) reliability and the solutions to the short blue PHOLED lifetimes. We begin reviewing the basics of OLED operation principles and the intrinsic degradation from the Marcus theory to the organic exciton kinetics. We show that the intrinsic degradation primarily involves a long-term electro-chemical process manipulated by the competition between radiative recombination and non-radiative annihilation of the excitons. Two major strategies are demonstrated to show that improving radiative recombination or suppressing the non-radiative annihilation leads to the high performance of PHOLEDs: polariton-enhanced Purcell effect and morphological control of host-dopant matrix. For the first strategy, we show that the triplet excitons in phosphorescent emitters gain a large Purcell effect, and form a strongly coupled quasiparticle, plasmon-exciton-polaritons (PEP), at the organic/metal interface. This leads to one and two orders of magnitude lifetime increase for single-stack and tandem blue PHOLEDs, respectively. For the second strategy, we show that a co-host matrix using sterically bulky material hinders the formation of nanocrystalline phases, and thereby the possible routes for non-radiative annihilation. This leads to doubling the efficiency of deep blue PHOLEDs and thereby the device lifetime. These strategies break the compromises between device lifetime, efficiency and color, paving the way for the application of the blue PHOLEDs in display and lighting.The second part of this thesis is aimed at using the exciton-polariton for long-range valley pseudospin transport in two-dimensional transition metal dichalcogenide (2D TMDC) semiconductors. We review the long-range Bloch surface wave (BSW) polariton propagation and magnetic manipulation of valley pseudospins in 2D TMDCs. We show that the valley pseudospin can coherently travel via BSW polariton carriers and spatially separate by a magnetic fields. The pseudospin polarization is encoded in the Poincare sphere trajectories, providing a novel platform for quantum information and quantum sensing.
- 일반주제명
- Physics
- 일반주제명
- Quantum physics
- 일반주제명
- Theoretical physics
- 일반주제명
- Nanoscience
- 기타저자
- University of Michigan Physics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017359927
■00520260202105237
■006m o d
■007cr#unu||||||||
■020 ▼a9798291567975
■035 ▼a(MiAaPQ)AAI32271960
■035 ▼a(MiAaPQ)umichrackham006311
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aZhao, Haonan.
■24510▼aLight-Matter Interaction in Organic and Low-Dimensional Semiconductors
■260 ▼a[Sl]▼bUniversity of Michigan▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a170 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Forrest, Stephen R.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2025.
■520 ▼aOrganic and inorganic semiconductors have been active research fields over the past decades. Excitons, the excited states in semiconductors, have enabled various functional optoelectronic devices that fundamentally change human lives. For example, the application of organic light-emitting devices (OLEDs) has revolutionized modern display technologies, while devices such as photovoltaics, transistors and other informatic devices are set to bring a larger impact to the world. Meanwhile, light-matter interaction, from the Purcell effect in the weak coupling regime to the exciton-polariton in the strong coupling regime, endows new degrees of freedom to manipulation of excitons properties, such as energy levels, spin information and non-equilibrium dynamics. This thesis is focused on the understanding exciton-photon interactions, and their essential role in the intrinsic improvement of these optic and electronic devices.The first part of this thesis studies the phosphorescent OLED (PHOLED) reliability and the solutions to the short blue PHOLED lifetimes. We begin reviewing the basics of OLED operation principles and the intrinsic degradation from the Marcus theory to the organic exciton kinetics. We show that the intrinsic degradation primarily involves a long-term electro-chemical process manipulated by the competition between radiative recombination and non-radiative annihilation of the excitons. Two major strategies are demonstrated to show that improving radiative recombination or suppressing the non-radiative annihilation leads to the high performance of PHOLEDs: polariton-enhanced Purcell effect and morphological control of host-dopant matrix. For the first strategy, we show that the triplet excitons in phosphorescent emitters gain a large Purcell effect, and form a strongly coupled quasiparticle, plasmon-exciton-polaritons (PEP), at the organic/metal interface. This leads to one and two orders of magnitude lifetime increase for single-stack and tandem blue PHOLEDs, respectively. For the second strategy, we show that a co-host matrix using sterically bulky material hinders the formation of nanocrystalline phases, and thereby the possible routes for non-radiative annihilation. This leads to doubling the efficiency of deep blue PHOLEDs and thereby the device lifetime. These strategies break the compromises between device lifetime, efficiency and color, paving the way for the application of the blue PHOLEDs in display and lighting.The second part of this thesis is aimed at using the exciton-polariton for long-range valley pseudospin transport in two-dimensional transition metal dichalcogenide (2D TMDC) semiconductors. We review the long-range Bloch surface wave (BSW) polariton propagation and magnetic manipulation of valley pseudospins in 2D TMDCs. We show that the valley pseudospin can coherently travel via BSW polariton carriers and spatially separate by a magnetic fields. The pseudospin polarization is encoded in the Poincare sphere trajectories, providing a novel platform for quantum information and quantum sensing.
■590 ▼aSchool code: 0127.
■650 4▼aPhysics
■650 4▼aQuantum physics
■650 4▼aTheoretical physics
■650 4▼aNanoscience
■653 ▼aLight-matter interaction
■653 ▼aOrganic light-emitting diodes
■653 ▼aExciton polariton
■653 ▼aTwo-dimensional semiconductors
■690 ▼a0605
■690 ▼a0565
■690 ▼a0599
■690 ▼a0753
■71020▼aUniversity of Michigan▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359927▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
