摘要： All-organic infrared (IR)-to-visible up-conversion organic light-emitting diodes (OLEDs) with an IR sensitivity up to 1,100nm were fabricated using a low bandgap polymer as the organic IR sensitizing layer. A novel low bandgap (1 eV) polymer, poly 4-(4,8-bis(5-(2-butyloctyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophen-2-yl)-6,7-diethyl-[1,2,5] thiadiazolo[3,4-g]quinoxaline (PBDTT-BTQ), with a strong photo-response in near-IR wavelengths of 700-1,100nm was first synthesized using a thiadiazolo[3,4]quinoxaline (BTQ) and a thiophene-substituted benzo[1,2-b:4,5-b2-bdithiophene (BDTT) as the electron-withdrawing and donating building blocks, respectively. The near-IR photodetector was then fabricated for evaluating a PBDTT-BTQ as the IR sensitizing layer. The PBDTT-BTQ IR photodetector showed detectivity greater than 1011 Jones in multi-spectral region (300-1,100nm) and the maximum detectivity of 3.1× 1011 Jones at the wavelength of 1,000nm due to significantly reducing dark current (8.8 × 10-6 mA/cm2 at -1 V). Finally, the all-organic IR up-conversion OLED with a PBDTT-BTQ IR sensitizer successfully converted invisible near-IR light of 700nm-1,100nm directly to visible green light with a peak emission wavelength of 520nm. This is the first report of all-organic IR-to-visible up-conversion OLED with near-IR sensitivity up to 1,100nm.