慶應義塾大学 · Materials Science
이소베 테츠히코 교수의 연구실은 탄소점(플루오레스센트 탄소점, CDs)과 화학적 합성에 기반한 고성능 나노소재 개발을 핵심으로 하며, 특히 비금속성·친환경적 특성을 지닌 발광 물질의 설계와 응용에 중점을 두고 있습니다. 반응 조건을 완화하면서도 좁은 스펙트럼 폭과 높은 발광 양자수율을 확보하는 새로운 합성 전략과 표면 기능화 기법을 개발하고 있으며, 태양전지 및 광전자 소자에서의 응용을 위한 다이내믹한 발광 특성 조절 기술을 연구하고 있습니다. 특히, 용매 친화성에 따른 색변화(솔바토크로미즘) 제어와 고효율 표면 기능화를 통해 실용적 응용 가능성을 높이고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Fluorescent carbon dots (CDs) are of interest as a promising alternative to quantum dots, partly because they do not include heavy metals. However, most CDs exhibit blue or green emission, while red-emitting CDs are required for a variety of applications. In the present work, CDs were synthesized by refluxing three phenylenediamine (PD) isomers with amino groups at different positions (<i>o</i>-PD, <i>m</i>-PD, and <i>p</i>-PD) in diphenyl ether at 250 °C for 4 h. Upon dispersing the resulting C
Calcium phosphate synthesized by a wet-mechanochemical reaction between Ca(OH)2 and H3PO4 is identified by X-ray diffractometry as an apparently single phase of hydroxyapatite (HAp). We examined more detail on the local structure of the product by high-resolution 1H and 31P solid-state double nuclear magnetic resonance (NMR) spectroscopy. Adsorbed and structural waters, as well as two kinds of OH groups in HAp, were observed in the inversion recovery 1H magic angle spinning (MAS) spectra. HAp an
Surface modification of <italic>p</italic>-phenylenediamine-derived carbon dots with decanoic acid and perfluorodecanoic acid successfully modulated fluorescence solvatochromism.
CuInS2 (CIS) quantum dots (QDs) were investigated as a luminescent downshifting (LDS) material that converts near-ultraviolet (UV) light to visible light and were applied to a single crystalline silicon (c-Si) solar module that has no spectral sensitivity in the near-UV region. The bandgap of the CIS/ZnS core/shell QDs was successfully adjusted to ∼3 eV, which was adequate for the LDS layer in solar devices, by changing the molar ratio of Cu/In. CIS/ZnS/ZnS core/shell/shell QDs with 59.9% absolu
Fluorescent carbon dots (CDs) represent a promising eco-friendly next-generation phosphor. However, most CDs exhibit broad photoluminescence (PL) spectra [full width at half-maximum (fwhm) over 60 nm]; few works on CDs with sharp PL spectra (fwhm less than 40 nm) have been reported. In addition, their syntheses and color tuning require harsh conditions of high temperatures, long reaction times, and high pressures with catalysts. Here, we successfully prepared narrow-bandwidth emissive CDs (fwhm
Surface modification of p-phenylenediamine-derived carbon dots using 4-morpholinoaniline with an electron-donating and rigid structure followed by purification using silica gel column chromatography increased the photoluminescence quantum yield from 28.3 to 41.8% in chloroform. The improved photoluminescence quantum yield was observed for the surface modification by postaddition of the surface modifier after the formation of the π-conjugated structure of the carbon dot core but was not observed
Photostable silica composites containing CuInS<sub>2</sub>/ZnS/ZnS quantum dots were fabricated using a sol–gel method. Their photoluminescence quantum yields were 43–47%.
