Thesis
Micro-photoluminescence studies of CsPbBr3 based nanostructures
- Abstract:
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This thesis summarises the photoluminescence results I have taken on the three different nanostructures of CsPbBr3 perovskite. Due to their microscopic dimensions, interesting physics phenomena under the fields of optical science and quantum mechanics have emerged. With the aid of a confocal micro-photoluminescence setup, detailed sub µm-level features can be retrieved directly for analysis. Although the three topics root from separate branches of specific physics fields, they all demonstrate how this system can be exploited as a general tool for examining the time-integrated and dynamical behaviours. Therefore, the thesis helps build the necessary knowledge for adaptation into different scenarios and external modification for a more specialised measurement. On the other side, much of the content has been devoted into systematic explanation of the relevant concepts in a self-contained fashion. These include the discussion on lasing phenomenon, Gaussian modes and triplet state. These recap or exposure to the different fields will be sufficient for the reader to understand the rest of the content.
The results are selected from the three papers I have written. The first topic is on confined Gaussian modes in CsPbBr3 microcavities. These cavities are naturally formed by the even smaller building blocks of quantum dots. The emission observed depends upon the collective behaviour of the zero-dimensional objects. The second topic is relevant to triplet state and resonant pumping of the CsPbBr3 nanocrystals. Doubly degenerate states associated to the tetragonal phase of the crystal have been presented. A resonantly optimised lasing effect then builds on this triplet signal and shows great potential for device applications. The third topic is about passivated CsPbBr3 nano/micro-rods with Pb(OH)2 cladding. A temperature-tolerant emission and bright stimulated emission from defect sites have been demonstrated.
All the three topics have illustrated the potential towards modern optoelectronic applications and the underlying physics can provide further inspiration from a slightly twisted angle for the future structure design.
In the appendix, a guide to the mapping software is introduced. This is a handy tool for analysing the complicated map data, which can be a crucial part of the PL study. The software provides control over the map position and wavelength, as well as a diffusion analyser. It also incorporates a zooming function such that local intensity rescaling is possible.
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Authors
Contributors
- Institution:
- University of Oxford
- Division:
- MPLS
- Department:
- Physics
- Sub department:
- Condensed Matter Physics
- Research group:
- Quantum Optoelectronics Group
- Role:
- Contributor
- Institution:
- Ulsan National Institute of Science and Technology (UNIST)
- Role:
- Contributor
- Institution:
- Dongguk University
- Role:
- Contributor
- Institution:
- University of Oxford
- Division:
- MPLS
- Department:
- Physics
- Sub department:
- Condensed Matter Physics
- Research group:
- Quantum Optoelectronics Group
- Oxford college:
- St Anne's College
- Role:
- Contributor
- Institution:
- University of Oxford
- Division:
- MPLS
- Department:
- Physics
- Sub department:
- Condensed Matter Physics
- Research group:
- Quantum Optoelectronics Group
- Oxford college:
- St Edmund Hall
- Role:
- Contributor
- Type of award:
- DPhil
- Level of award:
- Doctoral
- Awarding institution:
- University of Oxford
- Language:
-
English
- Keywords:
- Subjects:
- Deposit date:
-
2022-10-06
Terms of use
- Copyright holder:
- Guanhua Ying
- Copyright date:
- 2021
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