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  • 09월 01일 18시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Beneficial Effects of Water in the Hot-injection Synthesis of InP/ZnS Core-Shell Quantum Dots

2016년 9월 2일 10시 00분 50초
PHYS3-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 14시 : 25분
물리화학 - Recent Physical Chemistry Studies on Nanomaterials
저자 및
DGIST 에너지시스템공학, Korea
Nanoparticles of different metals, semiconductors and magnetic materials can self-assemble from colloidal solutions into long range ordered periodic structures (superlattices). Colloidal nanocrystals are considered promising building blocks for electronic and optoelectronic devices. In this presentation, I will explain that the presence of a small amount of water as an impurity during the hot-injection synthesis can significantly decrease the emission lines full width at half-maximum (FWHM) and improve the quantum yield (QY) of InP/ZnS quantum dots (QDs). By utilizing the water present in the indium precursor and solvent, we obtained InP/ZnS QDs emitting around 530 nm with a FWHM as narrow as 46 nm and a QY up to 45%. Without water, the synthesized QDs have emission around 625 nm with a FWHM of 66 nm and a QY of about 33%. As an example of their application in light-emitting diodes (LEDs), the green and red InP/ZnS QDs are combined with a blue LED chip to produce white light.
I will also show an efficient halide exchange reaction in cesium lead halide perovskite nanocrystals. The green light emitting CsPbBr3 nanocrystals can be tuned to emit over the entire visible spectral region (425~655 nm) by reacting with different concentrations of I or Cl precursors. The halide exchange reactions readily take place at room temperature and completed within seconds. A good photoresponsive behavior is observed for the CsPbI3 NCs films, indicating their potential application in optoelectronic devices.