Thermally Activated Charge Transfer in Dual-Emission Mn2+-Alloyed Perovskite Quantum Wells for Luminescent Thermometers
Chemistry of Materials
; 2021.
Article
in English
| Scopus | ID: covidwho-1713093
ABSTRACT
Owing to the pandemic of Coronavirus disease 2019 (COVID-19), the demands on ultracold-chain logistics have rapidly increased for the storage and transport of mRNA vaccines. Herein, we report a soluble luminescent thermometer based on thermally activated dual-emissions of Mn2+-alloyed 2D perovskite quantum wells (QWs). Owing to the Mn2+ alloying, the binding energy of perovskite QW exciton is reduced from 291 to 100 meV. It facilitates the dissociation of excitons into free charge carriers, which are then transferred and trapped on Mn2+. The temperature-dependent charge transfer efficiency can be tuned from 8.8% (-93 °C) to 30.6% (25 °C), leading to continuous ratiometrical modulation from exciton-dominated violet emission to Mn2+-dominated orange emission. The highest sensitivity (1.44% per K) is approximately twice that of the Mn2+-doped chalcogenide quantum dots. Taking advantage of highly reversible color switching, Mn2+-alloyed QWs provide an economical solution to monitor the ultracold-chain logistics of the COVID-19 vaccine. © 2022 American Chemical Society.
Binding energy; Charge transfer; Coronavirus; Excitons; Luminescence; Manganese compounds; Quantum chemistry; Semiconductor quantum wells; Vaccines; Charge transfer efficiency; Coronaviruses; Dual emissions; Free charge carriers; Orange emissions; Quantum-wells; Temperature dependent; Thermally activated; Ultra-cold; Violet emission; Semiconductor quantum dots
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Collection:
Databases of international organizations
Database:
Scopus
Language:
English
Journal:
Chemistry of Materials
Year:
2021
Document Type:
Article
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