A p -type doped organic layer combined with a hole-blocking layer has been experimentally demonstrated to serve as the charge generation unit in tandem-type organic light-emitting devices. The p -type layer functions as the source of both holes and electrons. Charge separation is explained by the tunneling model that the hole-blocking layer reduces the energy barrier for the electrons generated in the p -type layer to tunnel through into one light-emitting unit, while the holes generated in the p -type layer can transport to the other light-emitting unit easily under operation voltage.
|Original language||English (US)|
|Journal||Applied Physics Letters|
|State||Published - 2008|
Bibliographical noteFunding Information:
This work was supported by NSFC, MOST (973 project), and CAS Program for visiting Ph.D. students from universities in China.