Highly efficient electron transfer, without energy loss, for upconversion OLEDs

https://phys.org/news/2024-08-electron-highly-efficient-upconversion-oleds.html

"upconversion OLEDs utilize electron transfer from charge transfer state (weakly bound electron-hole pair at donor/ acceptor interface) to triplet excited state, through triplet-triplet annihilation, significantly lowering turn-on voltage of blue UC-OLEDs compared to conventional blue OLEDs, correcting for high driving voltage, low stability... <0.1 eV driving energetic force efficiency... PCAN/NDI-PhE novel donor-acceptor combination, fabricated efficient blue UC-OLED with low 1.57 turn-on voltage"