Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properti...Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properties and energy levels of molecules and their corresponding RTP behavior.While the role of the adaptability of molecular structure in modulating RTP is overlooked,it calls for further exploration.Herein,a series of vip-host systems were designed to realize bright red RTP with precisely structural regulation.Three naphthalimide derivatives with alkyl linkers of different lengths were utilized as vips and doped in hosts of three corresponding phthalimide derivatives.The doped systems with matched structures containing the exact-length alkyl linker exhibited a remarkable enhancement over 100 fold in RTP,analogous to the correct key fitting the right lock.In contrast,doped systems with mismatched structures showed almost undetectable RTP.Experimental results demonstrate that the suppression of nonradiative transition and structuredependent energy transfer of triplet excitons in the doped system play a crucial role in precisely structural matching,given that all vips possess similar electronic configurations and energy levels of excited states.This research may offer a novel insight into understanding the relationship between themolecular morphology and the RTP performance in host-vip systems.展开更多
基金the financial support from the National Natural Science Foundation of China(grant nos.52373199,52073315,and 52473195)Scientific Research Platforms and Projects of University of Department of Education of Guangdong Province(grant no.2024KCXTD009)+1 种基金Key Discipline Research Capability Enhancement Project of Department of Education of Guangdong Province(grant no.2024ZDJS037)Fundamental Research Funds for the Central Universities,Sun Yat-sen University(grant no.23yxqntd002)。
文摘Organic vip-host doped systems possessing roomtemperature phosphorescence(RTP)have attracted substantial attention.Conventionally,researchers have primarily focused on the correlation between the electronic properties and energy levels of molecules and their corresponding RTP behavior.While the role of the adaptability of molecular structure in modulating RTP is overlooked,it calls for further exploration.Herein,a series of vip-host systems were designed to realize bright red RTP with precisely structural regulation.Three naphthalimide derivatives with alkyl linkers of different lengths were utilized as vips and doped in hosts of three corresponding phthalimide derivatives.The doped systems with matched structures containing the exact-length alkyl linker exhibited a remarkable enhancement over 100 fold in RTP,analogous to the correct key fitting the right lock.In contrast,doped systems with mismatched structures showed almost undetectable RTP.Experimental results demonstrate that the suppression of nonradiative transition and structuredependent energy transfer of triplet excitons in the doped system play a crucial role in precisely structural matching,given that all vips possess similar electronic configurations and energy levels of excited states.This research may offer a novel insight into understanding the relationship between themolecular morphology and the RTP performance in host-vip systems.
