Authors: D. Haranath, D. Yadav, S. Sahai, V. Shanker
Affilation: CSIR-National Physical Laboratory, India
Pages: 721 - 724
Keywords: phosphor, carbon nanotube, hybrid device
We present a novel, cost-effective and simple technique operable at room temperature, wherein a non-electroluminescent (non-EL) material is being converted to exhibit stable and efficient EL using CNTs. The role of CNT has been identified as a local electric field enhancer and facilitator in the hot carrier injection inside the ZnS crystal to conceive EL in the hybrid material. Commercial ZnS:Cu phosphor (P-22G having quantum yield of 65±5%) is blended with a very low (0.01 wt.%) concentration of multi-walled CNTs; annealed in presence of a flux to produce an efficient and stable EL phosphor hybrid material. For the first time, we are successful in designing a novel device driven by alternating current (AC) and we anticipate the process could be easily scaled up to larger area panels. The electro-optical properties of the newly developed AC-EL device have been thoroughly discussed.