Journal
NANOPHOTONICS
Volume 8, Issue 4, Pages 599-605Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2018-0196
Keywords
optical cooling; plasmon; perovskite; up-conversion; anti-Stokes photoluminescence
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Funding
- Air Force Office of Scientific Research [FA9550-16-1-0154]
- Welch Foundation [A-1886]
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One-photon up-conversion, also called antiStokes photoluminescence (ASPL), is the process whereby photoexcited carriers scavenge thermal energy and are promoted into a higher energy excited state before emitting a photon of greater energy than initially absorbed. Here, we examine how ASPL from CsPbBr(3 )nanoparticles is modified by coupling with plasmonically active gold nanoparticles deposited on a substrate. Two coupling regimes are examined using confocal fluorescence microscopy: three to four Au nanoparticles per diffraction limited region and monolayer Au nanoparticle coverage of the substrate. In both regimes, CsPbBr3 ASPL is blueshifted relative to CsPbBr3 deposited on a bare substrate, corresponding to an increase in the thermal energy scavenged per emitted photon. However, with monolayer Au nanoparticle coverage, ASPL is enhanced relative to the conventional Stokes-shifted PL. Together, these phenomena result in a 6.7-fold increase in the amount of thermal energy extracted from the system during optical absorption and reemission.
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