Author(s)

Nguyen Nang Dinh, Do Ngoc Chung, Tran Thi Thao, Tran Thi Chung Thuy, Le Ha Chi, Vo-Van Truong

Department of Physics, Concordia University, Montreal, Canada.
Institute of Materials Science, Vietnamese Academy of Science and Technology, Hanoi, Vietnam.
University of Engineering and Technology, Vietnam National University Hanoi, Hanoi, Vietnam.
Water Resources University, Hanoi, Vietnam.

Nanorod-like TiO₂ (nc-TiO₂) and MoO₃ (nc-MoO₃) films were thermally grown from Ti- and Mo-metallic wafers. Nanohybrid films of N,N’-diphenyl-N,N’-bis(1-naphthyl)(1,1’-biphenyl)-4,4’diamine (NPB)/TiO₂ and NPB/MoO₃ used as anode/hole transport layer (HTL) heterojunctions in blue organic light emission diodes (OLEDs) were prepared by coating NPB onto the nc-TiO₂ and nc-MoO₃ and TiO₂. Characterization of the nanostructured hybrid layers showed that both the photoluminescent property and current-voltage (I-V) characteristics of the hybrid materials were significantly enhanced in comparison with the standard NPB polymer. The electroluminous efficiency of the hybrid devices was considerably enhanced in comparison with the standard device. This suggests a useful application for fabricating “reverse” OLEDs, where the emission light goes-out through the semitransparent cathode, instead of the indium tin oxide (ITO) anode. For this, the ohmic contacts of conducting wires to metallic electrodes can be made much better than to ITO anodes.

Organic Light Emitting Diodes (OLED); Hybrid Heterojunctions; Curent-Voltage (I-V) Characteristic; Luminous Efficiency

N. Dinh, D. Chung, T. Thao, T. Thuy, L. Chi and V. Truong, "Enhancement of Performance of Organic Light Emitting Diodes by Using Ti- and Mo-Oxide Nano Hybrid Layers," Materials Sciences and Applications, Vol. 4 No. 4, 2013, pp. 275-280. doi: 10.4236/msa.2013.44034.