Stable p-type Zn O films obtained by lithium-nitrogen codoping method.

By employing lithium and nitrogen codoping method, p-type zinc oxide (ZnO) films have been prepared, and the p-type conduction can maintain for 207 days. ZnO p-n junctions have been constructed based on the p-type ZnO. Under the drive of continuous current, obvious emission has been observed from the p-n junctions, and the ZnO p-n junction light-emitting devices (LEDs) can still work after placing in air ambient for 180 days. Room temperature electroluminescence spectra of the p-ZnO:(Li,N)/n-ZnO structured LEDs under continuous current recorded intermittently for 180 days. [ABSTRACT FROM AUTHOR]