Yadav, Deepika and Dwivedi, Dileep and Mishra, Savvi and Sivaiah, B. and Dhar, A. and Shanker, Virendra and Haranath, D. (2014) Investigation of Local Field Enhancement and Hot Electron Injection in Carbon Nano-Tube Doped Phosphor Nano-Composite for Ultra-Bright Electroluminescence. Science of Advanced Materials, 6 (2). 413-418. ISSN 1947-2935

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Present work focuses on the effective doping of multi-walled carbon nanotube (CNT) in the ZnS:Cu phosphor nano-composite and thereafter improvement in the optical performance of electroluminescent (EL) device due to increased local field effects. To facilitate doping of CNTs into the phosphor and decrease the operating voltage of the EL device, CNTs were shortened by milling and incorporated effectively using a flux assisted solid-state annealing reaction. Interestingly shorter the length of CNTs used; greater was the local field enhancement, improvement in brightness and efficiencies observed for the EL devices. When the field is applied, adequate charge carriers tunnel into the ZnS:Cu system through the tips of the CNTs by forming high energy hot spots thus enhancing the local field. The improved device characteristics are due to field enhancement and effective transfer of energy from hot spots to copper activator by impact ionization. The detailed electrical characterization of the novel EL device along with its brightness measurements are presented by considering the hot electron injection model.

Item Type: Article
Additional Information: Copyright for this article belongs to M/S American Scientific Publishers.
Subjects: Materials Science
Depositing User: Dr. Rajpal Walke
Date Deposited: 16 Oct 2015 07:20
Last Modified: 16 Oct 2015 07:20
URI: http://npl.csircentral.net/id/eprint/1355

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