Plasmonically-Enhanced Radioluminescence Induced by Energy Transfer in Colloidal CsPbBr3 Nanocrystals via Hybridization of Silver Nanoparticles

Nanocrystals of CsPbBr3, a colloidal perovskite, are hybridized with silver nanoparticles (Ag NPs) and organic molecules (2,5-diphenyloxazole, PPO) to improve X-ray radioluminescence (RL). It is known that charge transfer from the PPO molecules to the CsPbBr3 nanocrystals enhances the RL efficiency of the CsPbBr3 nanocrystals. In this study, Ag NPs are introduced to further enhance the RL efficiency. The plasmonic process of the Ag NPs is activated by the PPO molecules, which contain X-ray-induced high-energy charges. Subsequently, electric fields induced by the plasmonic process of the Ag NPs accelerate the charge transfer from the PPO molecules to the CsPbBr3 nanocrystals. The plasmonic effect of the Ag NPs is demonstrated by the full-width half maximum (FWHM): the photoluminescence FWHM of the hybridized CsPbBr3 nanocrystals is reduced, whereas the RL FWHM remains unchanged. The Ag-NP-induced plasmonic effect improves the RL efficiency of the PPO-decorated CsPbBr3 nanocrystals by & AP;10%. The obtained results demonstrate that a plasmonic process can strengthen the RL of X-ray scintillators for X-ray detection and imaging.

Automated summary

In this study, incorporating silver nanoparticles (Ag NPs) and organic molecules (2,5-diphenyloxazole, PPO) into nanocrystals of CsPbBr3 enhances the X-ray radioluminescence (RL) efficiency. The charge transfer from PPO molecules to CsPbBr3 nanocrystals is improved by the plasmonic effect of Ag NPs, activated by X-ray-induced high-energy charges in PPO molecules. The Ag-NP-induced plasmonic effect reduces the photoluminescence FWHM of CsPbBr3 nanocrystals while maintaining the RL FWHM, thus improving RL efficiency by approximately 10%.