Room-Temperature Phosphorescence of Pyrene Using Perovskite as a Triplet-Sensitizing Matrix and Oxygen Barrier

Area of Science:

• Materials Science
• Photochemistry
• Nanotechnology

Background:

• Efficient formation and transfer of triplet excited states are crucial for hybrid organic-inorganic materials.
• Material design must facilitate triplet sensitization and suppress excited-state deactivation.

Purpose of the Study:

• To demonstrate efficient triplet energy transfer (TET) in perovskite nanocrystal (PNC)─pyrene (Py) composite films.
• To enable room-temperature phosphorescence from pyrene via TET within a PNC matrix.

Main Methods:

• Fabrication of a composite film with uniformly dispersed pyrene within a perovskite nanocrystal matrix.
• Characterization of triplet excited state formation and energy transfer dynamics.
• Evaluation of phosphorescence emission lifetime and TET efficiency.

Main Results:

• Achieved efficient formation of molecular triplet excited states via through-space TET.
• Observed room-temperature pyrene phosphorescence with an average lifetime of 60.7 ms.
• Demonstrated a 22% TET efficiency and suppressed oxygen quenching due to the PNC matrix.

Conclusions:

• A simple and effective material design strategy using controlled interface interactions was proposed.
• This strategy extends the functionalities of organic acceptor molecules.
• Potential applications include triplet-triplet annihilation upconversion and photocatalysis.