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Influence of helium-ion bombardment on the optical properties of ZnO nanorods/p-GaN light-emitting diodes

Light-emitting diodes (LEDs) based on zinc oxide (ZnO) nanorods grown by vapor-liquid-solid catalytic growth method were irradiated with 2-MeV helium (He(+)) ions. The fabricated LEDs were irradiated with fluencies of approximately 2 × 10(13 )ions/cm(2 )and approximately 4 × 10(13 )ions/cm(2). Scann...

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Detalles Bibliográficos
Autores principales: Alvi, Naveed ul Hassan, Hussain, Sajjad, Jensen, Jen, Nur, Omer, Willander, Magnus
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3274553/
https://www.ncbi.nlm.nih.gov/pubmed/22152066
http://dx.doi.org/10.1186/1556-276X-6-628
Descripción
Sumario:Light-emitting diodes (LEDs) based on zinc oxide (ZnO) nanorods grown by vapor-liquid-solid catalytic growth method were irradiated with 2-MeV helium (He(+)) ions. The fabricated LEDs were irradiated with fluencies of approximately 2 × 10(13 )ions/cm(2 )and approximately 4 × 10(13 )ions/cm(2). Scanning electron microscopy images showed that the morphology of the irradiated samples is not changed. The as-grown and He(+)-irradiated LEDs showed rectifying behavior with the same I-V characteristics. Photoluminescence (PL) measurements showed that there is a blue shift of approximately 0.0347 and 0.082 eV in the near-band emission (free exciton) and green emission of the irradiated ZnO nanorods, respectively. It was also observed that the PL intensity of the near-band emission was decreased after irradiation of the samples. The electroluminescence (EL) measurements of the fabricated LEDs showed that there is a blue shift of 0.125 eV in the broad green emission after irradiation and the EL intensity of violet emission approximately centered at 398 nm nearly disappeared after irradiations. The color-rendering properties show a small decrease in the color-rendering indices of 3% after 2 MeV He(+ )ions irradiation.