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Case Studies

Microspectroscopy Study of Fluorescence from Colloidal Quantum Dots (Qin)

Microspectroscopy Study of Fluorescence from Colloidal Quantum Dots

Researcher Objectives

Dr. Haiyan QinDr. Haiyan Qin’s research group at Zhejiang University (Hangzhou, China) focuses on the synthetic chemistry, ligand chemistry, spectroscopy, and devices of colloidal nanocrystals, including semiconductor nanocrystals (quantum dots, or QDs). The group strives to select the most promising material systems as models for fundamental studies in order to promote the development of basic science for novel and high-performance materials that will be useful to humankind.

“We obtained very sharp images with FERGIE, which is not possible with a Czerny-Turner spectrometer. The aberration-free design is very impressive. This feature is extremely helpful to us when we navigate and search for individual QDs before taking spectral data.”



— Dr. Haiyan Qin, Associate Research Professor(秦海燕副研究员)

“I noticed the true spectrum-resolving power delivered by the aberration-free design. Peaks in a spectrum are symmetric and sharp, permitting the clear distinction of two adjacent signals.”



— Dr. Haiyan Qin, Associate Research Professor(秦海燕副研究员)

Quantum dots have already been used as luminescence nanomaterials in a number of applications. However, a lack of understanding of their spectral properties and synthetic control has so far limited their utility in real-world applications. Spectroscopy studies of the Qin group have two main objectives. The first is to assist synthetic chemistry development, especially synthetic control of the excited properties of colloidal nanocrystals. The second is to discover novel and high-performance optical materials for various applications.

The Qin group uses routine spectroscopic methods such as absorption and steady-state photoluminescence spectroscopies to study the optical properties of nanocrystals. In addition, the group uses two advanced techniques (see Figure 1). One is transient-state spectroscopy for studying excited-state dynamics in nanocrystal systems. The other is single-molecule spectroscopy.

Click image below to enlarge and see caption.

“I like the LightField software a lot. It was sensibly designed for scientific imaging and spectroscopy. The user interface is very friendly. Moreover, its data processing abilities enable us to directly analyze our results.”



— Dr. Na Wang, Postdoc Researcher (王娜博士)

FERGIE in Action

Dr. Qin’s research group recently used the FERGIE system to perform QD-related fluorescence microspectroscopy measurements. Figures 2–6 depict various aspects of their experimental setup and data.

Click images below to enlarge and see captions.

“I can clearly see the improvements offered by FERGIE over the Czerny-Turner spectrometer. The signal-to-noise ratio is almost 4 times better in the same conditions. In addition, the high-resolution performance helps me easily obtain the best focus of the microscope.”



— Hu Zhuang, Ph.D. Student (胡壮,博士生)

Dr. Haiyan QinDr. Haiyan Qin, Associate Research Professor
Department of Chemistry
Zhejiang University, P.R. China

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