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Choi, Hyosung,Park, Ji Sun,Jeong, Eunjae,Kim, Gi‐,Hwan,Lee, Bo Ram,Kim, Sang Ouk,Song, Myoung Hoon,Woo, Han Young,Kim, Jin Young WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.24
<P><B>Interface engineering by combination of TiO<SUB>x</SUB> and a conjugated polyelectrolyte as an electron transport layer</B> modifies the electrical contact between a metal electrode and an organic active layer with well‐aligned frontier orbital energy levels for efficient charge transport. This results in remarkable improvements in the device performance of inverted polymer solar cells and polymer light‐emitting diodes.</P>
Efficient Single‐Layer Polymer Light‐Emitting Diodes
Kabra, Dinesh,Lu, Li Ping,Song, Myoung Hoon,Snaith, Henry J.,Friend, Richard H. WILEY‐VCH Verlag 2010 Advanced Materials Vol.22 No.29
<P><B>Single‐layer polymer light‐emitting diodes</B> are fabricated using poly (9,9′‐dioctylfluorene)‐<I>co</I>‐ benzothiadiazole (F8BT) as the emissive layer in contact with metal oxide injection layers ITO/ZnO/Cs<SUB>2</SUB>CO<SUB>3</SUB>/F8BT/MoO<SUB>3</SUB>/Au. Luminous efficiencies of up to 23 cd A<SUP>−1</SUP> are achieved for polymer layer thicknesses near 1 <I>μ</I>m. </P>
Lu, Li Ping,Finlayson, Chris E.,Kabra, Dinesh,Albert‐,Seifried, Sebastian,Song, Myoung Hoon,Havenith, Remco W. A.,Tu, Guoli,Huck, Wilhelm T. S.,Friend, Richard H. WILEY‐VCH Verlag 2013 Macromolecular chemistry and physics Vol.214 No.9
<P><B>Abstract</B></P><P>A study of the organic semiconductor F8TBT is presented, directly comparing a conventional form (F8TBT‐out) with a form with varied alkyl side‐chain position (F8TBT‐in), in terms of optical properties and device performance in light‐emitting‐diodes (LEDs). Computational simulations of the side‐chain position with respect to the TBT unit reveal geometrical differences between F8TBT‐out and F8TBT‐in. π–π conjugation on the backbone of F8TBT‐in is interrupted by a distortion of the benzothiadiazole ring, leading to a blue‐shift of the absorption spectrum and increased photoluminescence quantum efficiency. Both conventional and hybrid LEDs demonstrate that devices with F8TBT‐in show improved performance, as compared to F8TBT‐out, illustrating how tuning the optoelectronic properties of conjugated polymers by varying the placement of side chains has an important role in device optimization.</P>