POS5-0062
Visible-Light Photoprogrammable Transistors Enabled by an All-OrganicVisible-Light Photoprogrammable Transistors Enabled by an All-Organic Triplet-Sensitized Diarylethene Channel Layer Triplet-Sensitized Diarylethene Channel Layer
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Jieun Kwon (POSTECH)
Co-Author(s)
Abstract
Light-programmable transistors are promising for next-generation electronics, but their reliance on high-energy UV light undermines stability and safety. Here, we demonstrate visible-light-only photoprogramming of organic field-effect transistors (OFETs) by integrating an all-organic triplet-sensitized diarylethene system into the channel layer. Rather than redesigning the photoswitch, this modular additive strategy renders a conventional UV-responsive diarylethene visible-addressable in solid-state transistors. A ternary blend of a polymer semiconductor (DPP-DTT), a diarylethene photoswitch (DAE-HP), and an organic triplet sensitizer (4CzIPN) enables fully reversible current modulation via photocyclization at 450 nm and photocycloreversion at 520 nm. The devices achieve a switching ratio up to 2.8 × 103 and remain stable over 100 cycles. Mechanistic studies show that DAE-HP and 4CzIPN co-localize within amorphous domains without perturbing polymer crystallinity, maintaining charge-transport continuity while ensuring the short-range proximity required for triplet exchange. Transient absorption spectroscopy supports efficient triplet–triplet energy transfer (TTET) from 4CzIPN to DAE-HP as the driver of visible-light photoswitching. These results identify nanoscale organization as the key lever for UV-free operation and provide a practical blueprint for safer, durable, and solution-processable light-programmable organic electronics.
