Photons and charges from colloidal doped semiconductor quantum dots

2019 ◽  
Vol 7 (47) ◽  
pp. 14788-14797 ◽  
Author(s):  
Tian Qiao ◽  
David Parobek ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Hot Electrons ◽  
Doped Quantum Dots

This work discusses the photophysical pathways in doped quantum dots responsible for generating photons of non-exciton origin and hot electrons.

scholarly journals Spin blockade and phonon bottleneck for hot electron relaxation observed in n-doped colloidal quantum dots

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junhui Wang ◽  
Lifeng Wang ◽  
Shuwen Yu ◽  
Tao Ding ◽  
Dongmei Xiang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Phonon Scattering ◽  
Surface States ◽  
Hot Electrons ◽  
Hot Electron ◽  
Phonon Bottleneck ◽  
Spin Interactions ◽  
Doped Quantum Dots ◽  
Electron Relaxation ◽  
Spin Blockade

AbstractUnderstanding and manipulating hot electron dynamics in semiconductors may enable disruptive energy conversion schemes. Hot electrons in bulk semiconductors usually relax via electron-phonon scattering on a sub-picosecond timescale. Quantum-confined semiconductors such as quantum dots offer a unique platform to prolong hot electron lifetime through their size-tunable electronic structures. Here, we study hot electron relaxation in electron-doped (n-doped) colloidal CdSe quantum dots. For lightly-doped dots we observe a slow 1Pe hot electron relaxation (~10 picosecond) resulting from a Pauli spin blockade of the preoccupying 1Se electron. For heavily-doped dots, a large number of electrons residing in the surface states introduce picosecond Auger recombination which annihilates the valance band hole, allowing us to observe 300-picosecond-long hot electrons as a manifestation of a phonon bottleneck effect. This brings the hot electron energy loss rate to a level of sub-meV per picosecond from a usual level of 1 eV per picosecond. These results offer exciting opportunities of hot electron harvesting by exploiting carrier-carrier, carrier-phonon and spin-spin interactions in doped quantum dots.

Photoemission of Energetic Hot Electrons Produced via Up-Conversion in Doped Quantum Dots

Nano Letters ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 7270-7275 ◽  
Author(s):  
Yitong Dong ◽  
David Parobek ◽  
Daniel Rossi ◽  
Dong Hee Son
Keyword(s):  
Quantum Dots ◽  
Hot Electrons ◽  
Doped Quantum Dots

Semiconductor Quantum Dots for Multicolor Fluorescence Imaging and Spectroscopy of Single Cancer Cells

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiaohu Gao ◽  
Shuming Nie ◽  
Wallace H. Coulter
Keyword(s):  
Quantum Dots ◽  
Cancer Cells ◽  
Fluorescence Imaging ◽  
Organic Dyes ◽  
Fluorescent Proteins ◽  
Single Cells ◽  
Quantitative Imaging ◽  
Semiconductor Quantum Dots ◽  
Single Cancer ◽  
Imaging And Spectroscopy

AbstractLuminescent quantum dots (QDs) are emerging as a new class of biological labels with unique properties and applications that are not available from traditional organic dyes and fluorescent proteins. Here we report new developments in using semiconductor quantum dots for quantitative imaging and spectroscopy of single cancer cells. We show that both live and fixed cells can be labeled with multicolor QDs, and that single cells can be analyzed by fluorescence imaging and wavelength-resolved spectroscopy. These results raise new possibilities in cancer imaging, molecular profiling, and disease staging.

Hot Topic and Challenge of Semiconductor Quantum Dots as Fluorescence Labels*

2010 ◽  
Vol 37 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Chang-Yan LI ◽  
Qian LI ◽  
Hai-Tao LIU ◽  
Jun ZHANG ◽  
DAMIRIN Aletangaole
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots
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