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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 CdHgSe/HgS/CdZnS Colloidal Quantum Dots Exhibiting Bright Short-Wave Infrared Luminescence

등록일
2019년 9월 9일 15시 57분 31초
접수번호
2020
발표코드
MAT.P-397 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 17일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Material Chemistry
저자 및
공동저자
Gyudong Lee, Sung Jun Lim1,*
Energy Science and Engineering, Daegu Gyeongbuk Institute of Science & Technology, Korea
1Division of Nanotechnology, Daegu Gyeongbuk Institute of Science & Technology, Korea
Bright short-wave infrared (SWIR; wavelength = 1000–1700 nm) light emitters provide unique opportunities in various applications including deep tissue biological imaging, telecommunication, and night-time surveillance. Previous researches have introduced SWIR emitters including carbon nanotubes, molecular dyes, rare earth-doped nanoparticles, and semiconductor quantum dots (QDs). However, SWIR emitters with high quantum yield (QY) in the entire SWIR region has not been realized. In this work, we present the fabrication of a new bright SWIR light emitter by synthesizing CdHgSe/HgS/CdZnS colloidal QDs. CdHgSe cores with NIR absorption (700−960 nm) were prepared via Cd-to-Hg cation exchange on zinc-blende CdSe QDs. Then HgS shell with controlled thickness (0.8−1.6 monolayers, MLs) was grown over the CdHgSe core to tune the emission wavelength in SWIR region. Finally, CdZnS layer (typically CdZnS ~4ML) was overcoated to boost QY, increase photostability, and improve their resistance to surface modification necessary for water solubilization. Photoluminescence (PL) spectra showed that our SWIR QDs show narrow-band emission (FWHM <0.2 eV) tunable in the entire SWIR region (1050−1550 nm). More importantly, absolute PL QYs of SWIR QDs reach as high as 70−83% in 1000−1350 nm and reduced to 39−49% in 1350−1550 nm. Furthermore, SWIR QDs show bright emission in water (QY 22−67%) after encapsulation with amphiphilic polymer coatings. In addition, we could fabricate high-intensity AC-driven LED devices with our SWIR QDs to produce electroluminescence covering the whole SWIR spectrum.

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