Abstract
We show the increase of the photoluminescence intensity ratio (PLR) and the emission rate enhancement of perovskite cesium lead bromide (CsPbBr3) and formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) in the presence of single and double gold layer cavities, which we refer to as Metal-Emitter (ME) and Metal-Emitter-Metal (MEM) nanostructures. Up to 1.9-fold PLRs and up to 5.4-fold emission rate enhancements were obtained for FAPbBr3 NCs confined by double gold layers, which are attributed to plasmonic confinement from the gold layers. The experimentally obtained values are validated by analytical calculations and electromagnetic simulations. Such an effective method of manipulation of the spontaneous emission by simple plasmonic nanostructures can be utilized in sensing and detection applications.
Highlights
Metal halide perovskites for quantum emitters have gained interest over the years due to their low cost and solution-processable characteristics [1]
The quantum emitters investigated in this work are cesium lead bromide (CsPbBr3 ) and formamidinium lead bromide (FAPbBr3 ) NCs, while the plasmonic cavity is defined in metal–emitter (ME) and metal
For CsPbBr3 NCs, whose emission wavelength is shorter than gold inter-band transition, the gold behaves more as dielectric and the light is confined by virtue of strong index contrast
Summary
Metal halide perovskites for quantum emitters have gained interest over the years due to their low cost and solution-processable characteristics [1]. The defecttolerant characteristics of halide perovskites are responsible for their high absorption coefficients and high photoluminescence (PL) quantum yield, enabling potential largescale applications in photovoltaic (PV) devices [2], scintillators [3,4,5,6], light-emitting diodes (LEDs), lasers, photodetectors, and field-effect transistors (FETs) [7]. Coupling electromagnetic modes with a quantum emitter [9,10] results in the emission rate modification known as the Purcell effect, which is relevant for realizing single-photon nano-emitters [11]. We investigate the spontaneous emission rate modification of halide perovskite nanocrystals (NCs) coupled with simple plasmonic cavities. The quantum emitters investigated in this work are cesium lead bromide (CsPbBr3 ) and formamidinium lead bromide (FAPbBr3 ) NCs, while the plasmonic cavity is defined in metal–emitter (ME) and metal–
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