Large area organic light emitting diode (OLED) has been fabricated on flexible polyethylene terephthalate (PET) substrate using electrohydrodynamics spray system with active area of 3 9 3 cm 2 . This solution processing of organic inks and quantum dots is performed at room temperature and atmospheric pressure in a single step processing compatible with roll-to-roll processing system. The thin film characterizations are performed by SEM, TEM, spectroscopes and semiconductor device analyzer. CdSe/ZnS quantum dots are used as emissive layer while PEDOT:PSS and MEH-PPV are used as hole and electron transport layers. OLED produced red light at the wavelength of 634 nm. A life time of 1 h at 0.3 lx was achieved by the OLED device.

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2-15) to a ductile material containing an oblate ellipsoidal cavity. And, they proposed a new approximate yield function incorporating the initial void shape effects, which is significant especially at low stress triaxiality. In the present work, the Gologanu-Leblond-Devaux's yield function for anisotropic sheet materials containing axisymmetric prolate ellipsoidal cavities is adopted in evaluating analytically forming limits of sheet metals under biaxial stretching by Marciniak and Kuczynski (M-K) model. The effect of a void shape and growth on the forming limits of sheet metals under biaxial tensile loading is introduced and examined within the framework of the M-K model, along with the effect of including a first-order strain gradient term in the flow stress. To confirm the validity of the proposed model, the predicted FLDs were compared with experimental results for steel sheets. The predicted forming limits for the voided sheets were found to agree well with the experimental data.