Abstract
The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported. Herein, a series of multi-host/guest ultralong organic phosphorescence materials with dynamic lifetime-tuning properties were reported. By doping a non-room-temperature phosphorescence emitter into various solid host matrices with continuously reduced triplet energy levels, a wide-range lifetime (from 3.9 ms gradually to 376.9 ms) phosphorescence with unchangeable afterglow colors were realized. Further studies revealed that the host matrices were employed to afford rigid environment and proper energy levels to generate and stabilize the long-live triplet excitons. Meanwhile, these multi-host/guest ultralong organic phosphorescence materials also exhibited excitation-dependent phosphorescence and temperature-controlled afterglow on/off switching properties, according to the virtue of various photophysical and thermal properties of the host matrices. This work provides a guiding strategy to realize lifetime-tuning ultralong organic phosphorescence with lifetime-order encoding characteristic towards widespread applications in time-resolved information displaying, higher-level security protection, and dynamic multi-dimensional anti-counterfeiting.
Highlights
The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported
We have carefully chosen a series of host matrices with suitable triplet energy levels between the lowest singlet and triplet states of PzPh and twisted conformations, namely benzophenone (BP), triphenylphosphine oxide (TPO), tetraphenyl-silane (TPSi), triphenylphosphine (TP), diphenyl-sulfone (SF), and triphenylamine (TPA)
These mH/G Ultralong organic phosphorescence (UOP) materials can be manufactured by solution evaporation method, conventional melt-casting method or easy grinding method, showing the advantages of concise and toilless fabrication of the mH/G UOP system
Summary
The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported. Further studies revealed that the host matrices were employed to afford rigid environment and proper energy levels to generate and stabilize the long-live triplet excitons These multihost/guest ultralong organic phosphorescence materials exhibited excitation-dependent phosphorescence and temperature-controlled afterglow on/off switching properties, according to the virtue of various photophysical and thermal properties of the host matrices. Simple flexible thin films were fabricated to show the lifetime-order encoding characteristics under different ambient conditions Such a mH/G doping strategy can realize wide-range tunable lifetimes and show widespread applications in timedependent information displaying, higher-level security protection, and dynamic multidimensional anticounterfeiting
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