Materials Science

A Simple Approach to Achieve Organic Radicals with Unusual Solid-State Emission and Extraordinary Stability


Herein, we report a simple approach to generate stable
luminescent radicals in the presence of gentle UV irradiation. The newly generated radical
species are capable of emitting unusual red light with a maximum fluorescence quantum
efficiency of 4.6% at ambient conditions in the solid state. Additionally, the luminescent
radicals show extraordinary stability with more than one-year life-span at ambient conditions.
X-ray diffraction study combined with photophysical and computational analyses reveal that
the unique molecular symmetry breaking in the crystalline state lead to the unusual formation
and stabilization of radical ion pairs via the photo-induced electron transfer (PET) process. Such
results represent the first time to achieve stable emissive radicals in the solid state at ambient
conditions via in-situ PET process.


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Supplementary material

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Supporting information
Thumbnail image of After purification-daylight.mp4
After purification-daylight
Thumbnail image of After purification-UV light.mp4
After purification-UV light
Thumbnail image of Commercial TCPP.mp4
Commercial TCPP
Thumbnail image of TCPP 100 K.txt
TCPP 100 K
Thumbnail image of TCPP 293 k.txt
TCPP 293 k