porous brother

One stimulus in situ induces two luminescence switchings, which is in situ composed of a first fast and a subsequent slow process, corresponding to the phase transition from the amorphous state to the staggered π–π dimer crystalline state to the solvent‐containing cocrystalline state, accompanied with luminescence switching from pure blue to green to deep blue.

Abstract

Commonly, one stimulus only induces one luminescence switching in stimuli‐responsive experiment. Herein, it is reported that one stimulus in situ induces two luminescent switches, resulting from two phase transitions in a solvent‐fuming process. Two phase transitions are in situ composed of a first fast and a subsequent slow process, corresponding to the change of molecular packing from the amorphous state to the π–π dimer crystalline state to the cocrystalline state with the inclusion of solvents, accompanied with luminescent transformation from pure blue to green to deep blue. Theoretical and experimental results reveal that the staggered π–π dimer stacking of anthracenes serves as the intermediate state to bridge the two phase transitions. This finding expands a new horizon in the stimuli‐responsive field and inspires novel applications in information storage and security fields.

Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off

Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off, Published online: 05 March 2018; doi:10.1038/s41566-018-0112-9

Organic light-emitting diodes featuring the compounds CzDBA and tBuCzBDA are shown to not only offer high external quantum efficiency, but also minimal reduction in performance at high brightness.