Annealing effect on the electrical and optical properties of Au/n-ZnO NWs Schottky diodes white LEDs
2013 (English)In: Superlattices and Microstructures, ISSN 0749-6036, E-ISSN 1096-3677, Vol. 62, 200-206 p.Article in journal (Refereed) Published
We report the post-growth heat treatment effect on the electrical and the optical properties of hydrothermally grown zinc oxide (ZnO) nanowires (NWs) Schottky white light emitting diodes (LEDs). It was found that there is a changed in the electroluminescence (EL) spectrum when post growth annealing process was performed at 600 degrees C under nitrogen, oxygen and argon ambients. The EL spectrum for LEDs based on the as grown NWs show three bands red, green and blue centered at 724, 518 and 450 nm respectively. All devices based on ZnO NWs annealed in oxygen (O-2), nitrogen (N-2) and argon (Ar) ambient show blue shift in the violet and the red emissions whereas a red shift is observed in the green emission compared to the as grown NWs based device. The color rendering index (CRI) and the correlated color temperature (CCT) of all LEDs were calculated to be in the range 78-91 and 2753-5122 K, respectively. These results indicate that light from the LEDs can be tuned from cold white light to warm white light by post growth annealing.
Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 62, 200-206 p.
ZnO nanowires, Schottky diodes, Post growth annealing, Electroluminescence
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-100481DOI: 10.1016/j.spmi.2013.07.014ISI: 000325588700022OAI: oai:DiVA.org:liu-100481DiVA: diva2:662971