Host Dearomatization for Prolonging Room-Temperature Phosphorescence

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Host-guest doping is a key strategy for creating organic room-temperature phosphorescence (RTP) materials, offering tunable structures and easy fabrication.
• Current molecular design primarily targets guest molecules, with a lack of systematic theoretical guidance for host material selection.

Purpose of the Study:

• To introduce a host dearomatization strategy for enhancing the afterglow properties of doped organic RTP systems.
• To provide a theoretical framework for rational host design in RTP material development.

Main Methods:

• Proposing a host dearomatization strategy by converting benzene rings to cyclohexane structures within host molecules.
• Conducting mechanistic studies to understand the effects of dearomatization on triplet-triplet energy transfer and electronic coupling.
• Evaluating the universality of the strategy across various host and guest systems.

Main Results:

• The host dearomatization strategy significantly prolonged RTP lifetimes, with a maximum enhancement of 58.65-fold.
• Dearomatization reduced intermolecular distances, enhancing triplet-triplet energy transfer and electronic coupling.
• The strategy demonstrated universality across diverse host and guest combinations.

Conclusions:

• Host dearomatization is an effective strategy for rational design of organic RTP materials with prolonged afterglow.
• The developed materials show potential for applications in time-resolved information encryption and switchable adhesives.
• This approach shifts focus to host molecular frameworks for efficient RTP material development.