Six-fold plasmonic enhancement of thermal scavenging via CsPbBr 3 anti-Stokes photoluminescence

Nanophotonics

article

Benjamin J. Roman¹  Matthew T. Sheldon² 

[1] Department of Chemistry, Texas A&M University, College Station;Department of Chemistry, Department of Materials Science & Engineering, Texas A&M University, College Station

关键词: optical cooling;    plasmon;    perovskite;    up-conversion;    anti-Stokes photoluminescence;   

DOI  :  10.1515/nanoph-2018-0196

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

One-photon up-conversion, also called anti-Stokes 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, CsPbBr 3 ASPL is blue-shifted relative to CsPbBr 3 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.

【 授权许可】

CC BY