Organic photo-detectors (OPDs) have been discussed as high-speed photo-detectors fabricated by vacuum and solution
processes. By vacuum process, OPD was fabricated on an ITO-coated glass substrate by organic molecular beam
deposition (OMBD). Copper phthalocyanine (CuPc) and N,N'-bis(2,5-di-tert-butylphenyl) 3,4,9,10-perylene
dicarboximide (BPPC) were used as a p-type and an n-type material. The photo response of OPD was evaluated using a
laser (λ=650 nm) and clear response signals at 100 MHz were observed. The imaging signals were successfully received
using the OPDs. For solution processed OPDs, poly(9,9-dioctylfluorene) and a phosphorescent iridium derivative were
used as a host and a dopant material, respectively. A pulsed signal of 100MHz and amore than 40 MHz were observed
by the OPDs fabricated by the vacuum processed and the solution processed devices, respectively.