I. D. W. Samuel

Bright electroluminescence from a new conjugated dendrimer

Photoluminescence and electroluminescence from a new conjugated dendrimer consisting of three distyrylbenzene units linked by a central nitrogen atom as core and meta-linked biphenyl units as dendrons were investigated. Bright electroluminescence was realized by using bilayer devices with blurred interface, which were fabricated by sequentially spin-coating a neat dendrimer and a dendrimer doped with 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD). By optimizing the concentration of PBD, the maximum brightness and EL quantum efficiency reach 4100 cd/m(2) and 0.10%, respectively.

Temperature tuning of a semiconducting-polymer DFB laser

Temperature tuning of an optically-pumped distributed-feedback laser formed by a thin film of MEH-PPV semiconducting polymer is reported. The tuning coefficient about 625 nm was approximately -0.4 nm/K, mainly attributable to the thermooptic coefficient of the MEH-PPV.

Efficient electrophosphorescent dendrimer LEDs

Our results show that conjugated dendrimers provide a way of making highly efficient organic LEDs in which the light-emitting layer is deposited from solution. An additional advantage of these dendrimers is that they enable electrophosphorescent devices to be made giving high efficiency at high brightness. Conjugated dendrimers provide a powerful way of taking chromophores and making them solution processible, and are an important new class of material for OLEDs.