Heterostructures of atomically flat semiconductor nanocrystals: from synthesis to LED applications

• Main Author: Izmir, Merve
• Other Authors: Hilmi Volkan Demir
• Format: Thesis-Doctor of Philosophy
• Language: English
• Published: Nanyang Technological University 2022
• Subjects: Engineering::Materials
• Online Access: https://hdl.handle.net/10356/163209
• Institution: Nanyang Technological University

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.