Adjusting optical and fluorescent properties of quantum dots: Moving towards best optical heat-rejecting materials
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10453865" target="_blank" >RIV/00216208:11320/22:10453865 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0M5r_CvTue" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0M5r_CvTue</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.solener.2022.04.026" target="_blank" >10.1016/j.solener.2022.04.026</a>
Alternative languages
Result language
angličtina
Original language name
Adjusting optical and fluorescent properties of quantum dots: Moving towards best optical heat-rejecting materials
Original language description
Quantum dots (QDs) coatings have recently attracted attentions as novel nano-scale fluorescent cooling materials with adjustable thermo-optical properties for urban overheating mitigation application. In this paper, a mathematical method for the prediction of impact of optical and fluorescent properties (i.e. absorption edge wavelength (lambda AE) and quantum yield (QY)) on fluorescent cooling indicators including re-emitted energy (QPL), effective solar reflection (ESR), and PL-related surface temperature reduction was proposed. The experimental thermal evaluation testing on three PbS QDs sample with different fluorescent properties and their corresponding non-fluorescent samples was performed to assess the accuracy of the proposed predictive model and evaluate the impact of fluorescent/optical properties on their cooling potential. The validated model was then used to optimize the fluorescent cooling potential for QDs samples with different fluorescent/optical properties. According to the model results, surface temperature reduction potential through PL effect demonstrates its highest value for QDs with solar absorption and QY near to unity, and lambda AE at around 1300 nm. QDs coatings with the optimal solar absorption, QY, and lambda AE showed up to 35 degrees C lower surface temperature than their corresponding non-fluorescent reference sample in a typical sunny day in Sydney. The maximum fluorescence contribution (Effective solar reflection (ESR)- Solar reflection (R)) is also estimated to be 0.44 for the fluorescent material with optimal optical and fluorescent property. Results of this study will support the next phase of research on fluorescent cooling.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Solar Energy
ISSN
0038-092X
e-ISSN
1471-1257
Volume of the periodical
238
Issue of the periodical within the volume
238
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
272-279
UT code for WoS article
000796580700004
EID of the result in the Scopus database
2-s2.0-85130145301