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Electroluminescence ͑EL͒ was observed on conventional cathodoluminescent ͑CL͒ phosphor with the incorporation of carbon nanotube ͑CNT͒ at ambient air. The role of CNT can be understood as enhancing the local electrical field, which allows electron injection to the active center of phosphor at relatively low operating voltages. In this EL device, the brightness of CL phosphor was significantly improved from no light emission in the case of no addition of CNT to 35 cd/ m 2 with 1 wt % CNT at 10 kHz of ac 300 V.

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