Abstract
We report the emission of a stable white luminescence from ZnO nanorods (NRs)-organic hybrid LEDs grown on cheap/disposable substrates by low temperature chemical growth. The low temperature chemical growth of ZnO NRs on disposable substrates would open the way to fabricate LEDs on large area disposable substrates with reasonable optical performance and practically negligible production cost. The electroluminescence (EL) spectra of the ZnO-organic hybrid white LEDs grown on cheap/disposable substrates reveal a broad emission band covering the whole visible region. The color rendering index (CRI) and the correlated color temperature (CCT) of the white LEDs were calculated to be 78-80 and 39004200 K, respectively. Depth resolved cathodoluminescence (CL) was used for probing the nature and spatial distribution of the radiative defects in the hybrid white LEDs structure. At room temperature the CL intensity of the deep level emission (DLE) is increased with the increase of the electron beam penetration depth due to the increase of defect concentration at the ZnO NRs/organic interface and found that the deep centers are distributed exponentially along the ZnO NRs.