查看更多>>摘要：Construction of C—F bonds is a direct and efficient method for introducing fluorine into pharmaceuticals,agrochemicals,and mate-rials.Strategies such as nucleophilic,electrophilic,radical,and transition-metal catalyzed fluorination have been developed to meet the demand of diverse C—F bond formation.Among them,radical fluorination has been witnessed with substantial advancement in a recent decade.Herein,we reviewed methods for formation of C—F bonds with carbon-centered radicals as key intermediates,es-pecially in recent five years.We introduce in the paper with different fluorinating reagents,strategies for radical generation,and ap-plication in late-stage functionalization and synthesis of PET tracers.We also indicate the current limitations and propose the direc-tion of the field for the future development.
查看更多>>摘要：Rare earth(RE)ions,with abundant 4f energy level and unique electronic arrangement,are considered as substitutes for Pb2+in per-ovskite nanocrystals(PNCs),allowing for partial or complete replacement of lead and minimizing environmental impact.This review provides a comprehensive overview of the characteristics of RE-doped PNCs,including up-conversion luminescence,down-conversion luminescence,and quantum confinement effects,etc.Additionally,RE doping has been found to effectively suppress defect formation,reduce nonradiative recombination,enhance photoluminescence quantum yield(PLQY),and even allow for controlling over the mor-phology of the nanocrystals.The review also highlights the recent advancements in lead-free RE-based perovskites,especially in the case of Eu-based perovskites(CsEuBr3 and CsEuCl3).Furthermore,it briefly introduces the applications of PNCs in various fields,such as perovskite solar cells(PSCs),luminescent solar concentrators(LSCs),photodetectors(PDs),and light-emitting diodes(LEDs).A sys-tematic discussion on the luminescence mechanisms of RE-doped PNCs and lead-free RE-based perovskites is provided,along with an outlook on future research directions.The ultimate goal of this review is to provide guidance for the development of RE-based perov-skite optoelectronic devices.
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