Abstract
Lead halide perovskite nanocrystals (NCs), especially the all-inorganic perovskite NCs, have drawn substantial attention for both fundamental research and device applications in recent years due to their unique optoelectronic properties. To build high-performance nanophotonic devices based on perovskite NCs, it is highly desirable to couple the NCs to photonic nanostructures for enhancing the radiative emission rate and improving the emission directionality of the NCs. In this work, we synthesized high-quality CsPbI3 NCs and further coupled them to dielectric circular Bragg gratings (CBGs). The efficient couplings between the perovskite NCs and the CBGs resulted in a 45.9-fold enhancement of the photoluminescence (PL) intensity and 3.2-fold acceleration of the radiative emission rate. Our work serves as an important step for building high-performance nanophotonic light emitting devices by integrating perovskite NCs with photonic nanostructures.
Highlights
All-inorganic perovskite nanocrystals (NCs) are an emerging class of material for lighting and display technologies due to their excellent optoelectronic properties
We synthesize high-quality CsPbI3 NCs emitting at visible light (See Appendix A) and further efficiently couple the NCs to the SiN circular Bragg gratings (CBGs) to simultaneously enhance their radiative rate and improve their emission directionality
Both the intensity enhancement and the lifetime reduction in our experiment strongly suggest that efficient couplings between the NCs and the CBGs were achieved
Summary
All-inorganic perovskite nanocrystals (NCs) are an emerging class of material for lighting and display technologies due to their excellent optoelectronic properties. Compared with organic–inorganic hybrid perovskite, all-inorganic perovskite NCs exhibit several advantages, including wider wavelength tenability [1], higher quantum yield at ambient temperature [2], and lower cost They are easy to synthesize and can be integrated with various photonic nanostructures [3,4,5]. We synthesize high-quality CsPbI3 NCs emitting at visible light (See Appendix A) and further efficiently couple the NCs to the SiN circular Bragg gratings (CBGs) to simultaneously enhance their radiative rate and improve their emission directionality. Further developments in this direction may result in high-performance integrated devices with applications in nanophotonics and quantum optics
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