Optical Nanomaterials Lab
Optical nanomaterials design for biomedical and optoelectronic applications
Optical nanomaterials design for biomedical and optoelectronic applications
2025년 1학기(여름방학) 학부 연구인턴 모집
광나노소재 연구실에서 관련 분야 학부 연구인턴을 모집합니다.
| 디스플레이/센서용 친환경 반도체 나노소재 개발
| 발광/발열성 나노소재 기반 질병 진단/치료제 개발
| 저자극/무독성 나노소재 기반 기능성 화장품 개발
| 이산화탄소 등 오염 물질 저감/분해용 촉매 나노소재 개발
미래 산업 전반과 밀접한 연관이 있는 나노소재 연구의 특성상 졸업 후 반도체, 디스플레이, 의료, 화장품 관련 기업을 비롯, 연구소, 대학 등 연구기관에 이르기까지 다양한 진로 선택의 기회가 주어집니다. 관심있는 학생은 숙명여자대학교 화공생명공학부 권우성 교수(wkwon@sm.ac.kr)에게 연락 바랍니다.
Long-lived room-temperature phosphorescence from silica nanoparticles with in situ generated carbonaceous defects for blue organic light-emitting diodes
In this study, in situ formed silica nanoparticles (SNPs) emitting second-level phosphorescence at room temperature without a phosphorescent dopant have been achieved for the first time. This phosphorescence is achieved through the simple in situ formation of carbonaceous defects (CDs) within the SNPs, followed by passivation of the CDs by a robust silica matrix. The CD in the SNPs, termed CD@SNPs, are synthesized by cross-linking tetraethyl orthosilicate (TEOS) and (3-aminopropyl)triethoxysilane (APTES), and these cross-linked components create a porous structure within the silica matrix. Upon calcination, the carbon-related structures within the pores deform, leading to the formation of CDs. Confined within a robust silica matrix, the molecular motion of the CD is restricted, facilitating the generation of a stable triplet state and suppressing nonradiative decay. Moreover, the robust silica matrix passivates the CD confined in the SNPs at a nanoscale. These comprehensive effects enable prolonged phosphorescence emission from the SNPs. In addition, these phosphorescence-emitting SNPs have been applied as dopants in the emissive layer of organic light-emitting diodes to realize blue light emission. This feature suggests the possibility of utilizing luminescent SNPs as light emitters in display technologies. This work has been published in ACS Applied Materials & Interfaces (IF = 8.3).
Room-temperature phosphorescence of defect-engineered silica nanoparticles for high-contrast afterglow bioimaging
Room-temperature phosphorescence (RTP) has tremendous potential in optics and photonics. Unlike fluorescence, RTP has substantial afterglow signals even after the excitation light is removed, which allows for extended acquisition times and higher signal-to-noise ratio under time-gated bioimaging. However, conventional RTP materials, both metal-containing and metal-free organic compounds, typically have limited photostability and inherent toxicity, making them unsuitable for long-term biological applications. Here, we report metal- and organic fluorophore-free silica nanoparticles (SNPs) that facilitate long-lived phosphorescence and exhibit RTP for high-contrast bioimaging. Polycondensation of silicon precursors and silyl biphenyls forms biphenyl-doped SNPs (bSNPs), and thermal decomposition of biphenyl moieties generates optically active defects in the biphenyl-bonded silicate network. The calcined bSNPs (C-bSNPs) have RTP-related biphenyl defects composed of carbon impurities, corresponding to spectroscopic measurements and ab initio calculations. Facile surface functionalization of defect-engineered C-bSNPs with tumor-targeting peptides while maintaining long-lived RTP allows for tissue autofluorescence-free in vivo bioimaging for cancer diagnosis, surpassing the limitations of continuous-wave imaging. This work has been published in Chemical Engineering Journal (IF = 15.1).
서세정 학생 "2025 한국화학공학회 봄 학술대회" 우수포스터발표상 수상
석사과정 서세정 학생이 지난 4월 23일에서 25일에 걸쳐 열린 "한국화학공학회 봄 학술대회"에서 우수포스터발표상을 수상했다. 서세정 학생은 "Interparticle complexation-induced deep-red emission in sulfur-doped carbon dots for red-blue-mixed white-light-emitting diodes"라는 제목으로 황 도핑된 발광성 탄소나노입자를 이용한 친환경 백색 광전소자개발에 대해 발표했다. (관련기사) https://www.sookmyung.ac.kr/kr/news/award-news.do?mode=view&articleNo=89618&article.offset=0&articleLimit=9
박세현 학생 "2024 한국화학공학회 봄 학술대회" 우수포스터발표상 수상
석사과정 박세현 학생이 지난 4월 20일에서 23일에 걸쳐 열린 "한국화학공학회 봄 학술대회"에서 우수포스터발표상을 수상했다. 박세현 학생은 "Bandgap modulation of carbon dots via intermolecular cyclization of naphthylamine for multicolor light-emitting diodes"라는 제목으로 질화 탄소양자점의 화학적 구조 조절 및 다양한 색상의 LED 제작에 대한 연구 결과를 발표했다. (관련기사)
조수현 학생 "2023 한국화학공학회 가을 국제 학술대회" 우수구두발표상 수상
석사과정 조수현 학생이 지난 10월 25일에서 27일에 걸쳐 열린 "한국화학공학회 가을 국제 학술대회"에서 우수구두발표상을 수상했다. 조수현 학생은 "Predictable incorporation of nitrogen into carbon dots: Insights from pinacol rearrangement and iminium ion cyclization"이라는 제목으로 기존 화학 반응에 기반한 질소 도핑된 탄소양자점 합성법 설계 전략 및 이를 이용한 세포 이미징과 광역학 치료 연구에 대해 발표했다. (관련기사) https://www.sookmyung.ac.kr/kr/news/award-news.do?mode=view&articleNo=84903&article.offset=0&articleLimit=9