Enhanced energy transfer efficiency between CsPbBr3 nanocrystals and organic dye DCJTB based on Ag@SiO2 core-shell nanoparticles

Development of efficient fluorescence resonance energy transfer (FRET) is essential for application in optoelectronic and sensing technologies. In this work, we synthesized silica-coated silver nanoparticles (Ag@SiO 2 core-shell NPs) with different shell thicknesses and investigated their effect on a FRET system composed of CsPbBr 3 nanocrystals (NCs) and red dye 4-(Dicyanomethylene)-2-tert-butyl-6-[1,1,7,7-tetramethyljulolidin-4-yl-vinyl]-4H-pyran (DCJTB). Compared to the nanoparticle-free system, doping the CsPbBr 3 : DCJTB system with Ag@SiO 2 core-shell NPs of optimal shell thickness enhanced the fluorescence emission intensity to 3.5 times that of the nanoparticle-free FRET system and improved the FRET efficiency from 28% to 75%. Moreover, the Ag@SiO 2 NPs with the optimal shell thickness can more effectively enhance FRET efficiency than the bare Ag NPs. It is attributed to the fact that the Ag@SiO 2 core-shell NPs can simultaneously avoid quenching effect and effectively enhance the FRET efficiency through the plasmonic properties. This study provides an effective approach for designing highly efficient FRET system and offers a pathway for further enhancing the performance of optoelectronic devices.