Six-fold plasmonic enhancement of thermal scavenging via CsPbBr₃ anti-Stokes photoluminescence

Abstract

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 CsPbBr3 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 blue-shifted 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.

Rb2CuX3 (X = Cl, Br): 1D All‐Inorganic Copper Halides with Ultrabright Blue Emission and Up‐Conversion Photoluminescence

“…Considering the fact that single crystals of Rb 2 CuCl 3 shows a 100% PLQY, and the maximum ASPL occurs at 395 nm (3.14 eV) under 520 nm (2.385 eV), using the above equation, an optical cooling efficiency of ≈32% is estimated. This value is similar to the highest values recently reported for hybrid perovskite10a,29 and all inorganic metal halides . Further detailed spectroscopic investigations including Raman spectroscopy is in progress to better understand the physical origin of the observed ASPL of Rb 2 CuCl 3 .…”

Harvesting of the infrared energy: Direct collection, up-conversion, and storage

“…HBA assisted ASPL has attracted growing interest in recent years due to potential application in various fields, such as photovoltaic energy conversion [50], photoluminescence bioimaging [51], thermal probes [52], optical refrigeration of solids [53][54][55][56], etc. It was shown that this type of up-conversion can take place both in inorganic materials, such as rare-earthdoped crystals [57][58][59], II-VI [60,61], InP [62], PbS [63] semiconductor quantum dots, InP and GaAs bulk semiconductors [64], inorganic perovskite nanoparticles [65][66][67], carbon nanotubes [68], and some organic dyes based on rhodamine [69], porphyrin [70], spirolactam moieties under acidic conditions [71], polymethine [72], fluorescein and oxazine [49].…”

Chemical and Structural Stability of CsPbX3 Nanorods during Postsynthetic Anion-Exchange: Implications for Optoelectronic Functionality

“…Lead halide perovskites (LHPs) with the structure APbX 3 ( X = Cl, Br, I) are an emerging class of semiconductor materials that have gained intense attention due to their excellent optoelectronic properties. LHP colloidal nanocrystals (NCs) exhibit strong photoluminescence quantum yield (PLQY), have high defect tolerance, and possess bandgaps that are tunable across the entire visible spectral region. , These promising features have prompted significant research into the use of LHP NCs for applications in photovoltaics, , light-emitting devices, , photodetectors, , optical refrigeration, − and photocatalysis. , …”