eprintid: 10203014
rev_number: 13
eprint_status: archive
userid: 699
dir: disk0/10/20/30/14
datestamp: 2025-03-06 07:55:11
lastmod: 2025-03-06 07:55:11
status_changed: 2025-03-06 07:55:11
type: thesis
metadata_visibility: show
sword_depositor: 699
creators_name: Xu, Zhijie
title: Bright Harvest: Concepts, Modelling, and Fabrication of Horticulture Luminescent Solar Concentrators
ispublished: unpub
divisions: UCL
divisions: B04
divisions: F46
note: Copyright © The Author 2025.  Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/).  Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms.  Access may initially be restricted at the author’s request.
abstract: Luminescent solar concentrators (LSCs) are capable of achieving spectral conversion, allowing for the tailoring of the solar spectrum to better suit the demands of
photosynthesis. However, traditional LSCs are engineered to trap spectrally converted light instead of extracting it.
In this thesis, a novel optical device termed Horticulture Luminescent Solar
Concentrators (HLSCs) is presented, developed from the framework of conventional LSC devices. HLSCs distinguish themselves from traditional LSCs by not
only facilitating efficient spectral conversion but also by their improved ability to
extract light from the bottom surface, which faces the plants. Overall, HLSCs are
defined by their dual capabilities: spectral conversion and effective light extraction.
I start by evaluating the specific needs of horticulture to explain the reasons
for using HLSCs. For the first time, we reevaluate and define the optical metrics
for HLSCs by analyzing potential loss channels and performance metrics in HLSC
devices. The impact factors are then derived from a detailed analysis of the total
emission expression.
To enhance the comprehension of how these factors affect HLSC performance,
I develop a model of the HLSC device using the Monte Carlo ray tracing method.
This model incorporates an analysis of several factors, such as optical density, absorption and emission spectra, refractive index, and quantum yield (QY), which are
examined through both simulation and experimental results.
Additionally, I propose a potential method to enhance the overall outcoupling
efficiency of HLSC devices through the use of micro-cone arrays. A prototype device is fabricated using two-photon polymerization (2PP), nano-imprint lithography (NIL) and soft lithography. This device has demonstrated improved light extraction
performance and diffused emission, which are beneficial for plant growth.
date: 2025-01-28
date_type: published
oa_status: green
full_text_type: other
thesis_class: doctoral_open
thesis_award: Ph.D
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2347017
lyricists_name: Xu, Zhijie
lyricists_id: ZXUDX15
actors_name: Xu, Zhijie
actors_id: ZXUDX15
actors_role: owner
full_text_status: public
pages: 176
institution: UCL (University College London)
department: Electronic & Electrical Engineering
thesis_type: Doctoral
editors_name: Papakonstantinou, Ioannis
citation:        Xu, Zhijie;      (2025)    Bright Harvest: Concepts, Modelling, and Fabrication of Horticulture Luminescent Solar Concentrators.                   Doctoral thesis  (Ph.D), UCL (University College London).     Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10203014/2/Zhjiie_Thesis_Final.pdf