On the combination of quantum dots with near-infrared reflective base coats to maximize their urban overheating mitigation potential

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10420710" target="_blank" >RIV/00216208:11320/20:10420710 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=BzE3C4mjQo" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=BzE3C4mjQo</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.solener.2020.09.069" target="_blank" >10.1016/j.solener.2020.09.069</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the combination of quantum dots with near-infrared reflective base coats to maximize their urban overheating mitigation potential

Popis výsledku v původním jazyce

Application of highly absorptive construction materials is proved to be one of leading causes of urban overheating in big cities. To avoid the excessive heat by the conventional construction materials, several advanced heat-rejecting coating technologies were developed during the last decades. The main idea behind heat-rejecting coatings is to have colder coatings with the same appearance and colour of conventional coatings. One of the existing technologies for heat-rejecting coatings are advanced coatings with high solar reflection in the infrared range or so-called cool coatings. Recently, re-emission of the visible-range light by nano-scale semiconductors, known as Quantum Dots (QDs), were introduced as another effective heat-rejecting technology. In this paper, we showed that QDs also demonstrate a very high solar transmission in the near-infrared range, and therefore, highly near-infrared reflective base layer can significantly improve their cooling potential. The high transmission value in the near-infrared range is due to the low absorption coefficient in the wavelengths longer than absorption edge wavelength (i.e. the wavelength corresponding to the bandgap energy) in semiconductors. We show that surface temperature reduction potential of CdSe/ZnS QDs film through fluorescent cooling is about 2.5 degrees C, which could be increased by another 8.1 degrees C with a highly near-infrared reflective base layer in a typical sunny day.

Název v anglickém jazyce

On the combination of quantum dots with near-infrared reflective base coats to maximize their urban overheating mitigation potential

Popis výsledku anglicky

Application of highly absorptive construction materials is proved to be one of leading causes of urban overheating in big cities. To avoid the excessive heat by the conventional construction materials, several advanced heat-rejecting coating technologies were developed during the last decades. The main idea behind heat-rejecting coatings is to have colder coatings with the same appearance and colour of conventional coatings. One of the existing technologies for heat-rejecting coatings are advanced coatings with high solar reflection in the infrared range or so-called cool coatings. Recently, re-emission of the visible-range light by nano-scale semiconductors, known as Quantum Dots (QDs), were introduced as another effective heat-rejecting technology. In this paper, we showed that QDs also demonstrate a very high solar transmission in the near-infrared range, and therefore, highly near-infrared reflective base layer can significantly improve their cooling potential. The high transmission value in the near-infrared range is due to the low absorption coefficient in the wavelengths longer than absorption edge wavelength (i.e. the wavelength corresponding to the bandgap energy) in semiconductors. We show that surface temperature reduction potential of CdSe/ZnS QDs film through fluorescent cooling is about 2.5 degrees C, which could be increased by another 8.1 degrees C with a highly near-infrared reflective base layer in a typical sunny day.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Solar Energy

ISSN

0038-092X

e-ISSN

—

Svazek periodika

211

Číslo periodika v rámci svazku

NOV 15 2020

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

111-116

Kód UT WoS článku

000593745900005

EID výsledku v databázi Scopus

2-s2.0-85091655122