Heterostructures of atomically flat semiconductor nanocrystals: from synthesis to LED applications
Colloidal nanoplatelets (NPLs) have recently emerged as an interesting family of semiconductor nanocrystals for optoelectronic applications. NPLs exhibit narrow emission linewidth, giant oscillator strength, large absorption coefficient and reduced Auger recombination compared to zero-dimensio...
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| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
| Published: |
Nanyang Technological University
2022
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| Online Access: | https://hdl.handle.net/10356/163209 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Colloidal nanoplatelets (NPLs) have recently emerged as an interesting family of
semiconductor nanocrystals for optoelectronic applications. NPLs exhibit narrow emission
linewidth, giant oscillator strength, large absorption coefficient and reduced Auger
recombination compared to zero-dimensional quantum dots and bulk semiconductors. The
heterostructures of these nanocrystals can be designed to achieve increased
photoluminescence quantum yield, photostability and colour purity. Such advantages make
them a promising candidate for solution-processable light-emitting diodes (LEDs) with
superior features such as high efficiency, low power consumption, pure colour, and design
flexibility. To accomplish tunable excitonic properties in colloidal NPLs, alloying in the
host nanocrystals is also a viable option. Additionally, doping NPLs may enable Stokes shifted and tunable emission by controlling the dopant and its concentration. The doping of
such atomically flat semiconductor nanostructures with impurity atoms opens new
possibilities for LEDs. This thesis proposes the rational design, synthesis, and
characterization of these undoped/doped NPLs as well as their advanced heterostructures
(including core/shell, core/crown, and core/crown/shell), and their applications in LEDs. |
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