D. Haranath, Sonal Sahai, Mushahid Husain, Savvi Mishra, Virendra Shanker
We present a novel, cost-effective and simple room temperature technique, wherein a non-electroluminescent (non-EL) material is being converted to exhibit stable and efficient EL at low-voltages with the application of CNTs. A commercial ZnS:Cu phosphor (P-22G having a quantum yield of 65\pm5%) was combined with a very low (0.01 wt.%) concentration of carbon nano-tubes (CNTs) dispersed in ethanol and its alternating current driven smart electroluminescence (AC-EL) is demonstrated for the first time. The role of CNTs has been understood as a local electric field enhancer and facilitator in the hot carrier injection to produce EL in the hybrid material. The mechanism of EL is discussed using an internal field emission model, intra-CNT impact excitation and the recombination of electrons and holes through the impurity states, which is not commonly observed in conventional AC-EL devices.
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http://arxiv.org/abs/1207.7320
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