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Updated: Feb 1, 2026

Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Single-channel UV/vis dual-band detection with ZnCdS:Mn/ZnS core/shell quantum dots
Yufen Yuan1, Yuxiao Han1, Bo Huang1
1Advanced Photonics Centre, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China.
Abstract:
In the ultraviolet detection system, the Si-based photodetector could be sensitised with different kinds of fluorescent material to enhance its response in the short-wavelength range. Thick-shell ZnCdS:Mn/ZnS core/shell quantum dots (QDs) exhibit unique advantages in UV signal sensitisation due to their long PL lifetime, as well as stable emission matched with CCD's response. Herein, a single-channel UV panoramic detection system based on these Mn-doped QDs has been proposed. The QDs@PMMA film was attached on a Si-based CCD camera versus a tapered fibre, and an optical chopper was mounted before the QDs@PMMA film. The long lifetime fluorescence originating from UV signal could be still collected by the CCD camera when the chopper is in the 'off' state, hence the UV/vis signal ratio is significantly enhanced.
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