Third-generation organic electroluminescence materials†

Highly efficient near-infrared hybrid organic-inorganic nanocrystal electroluminescence device

We report the use of PbS nanocrystals within a hybrid device that emits 1.2 m electroluminescence with an external quantum efficiency of 1.15% corresponding to an internal quantum efficiency of 5% –12% thus demonstrating a viable, low-cost, highly efficient near infrared organic electroluminescent device. Direct generation of the excited state on the nanocrystal result in eliminating competing ...

Competition between excitons and exciplexes: Experiments on multilayered organic light emitting diodes

The electronic processes responsible for charge transport and electroluminescence in multilayered organic light emitting diodes OLEDs are very sensitive to the properties of the organic heterojunction. In particular, the height of the energy barrier affects the way in which electrons and holes meet at the heterojunction, the way in which the barrier is crossed, and the probability for photon cr...

STM-electroluminescence probes of metallic and polymeric materials

The STM-electroluminescence technique is shown to be a valuable tool for characterizing optoelectronic properties and understanding structure-function relationships in heterogeneous or disordered materials on nanometer length scales. The intensity of photon emission induced by tunneling electrons from rough Au films is found to depend on the surface feature size. This size-dependent photon emis...

Exciplex Electroluminescence of the New Organic Materials for Light-Emitting Diodes

Phosphorescent materials for application to organic light emitting devices*

Organic phosphors have demanded the attention of the organic electroluminescence community because they enable ef®ciencies quadruple that of ̄uorescent materials. In this work, we review the categories of organic phosphors: lanthanide complexes, organic phosphors and metal-organic complexes. The characteristics necessary for ef®cient phosphorescence are considered and conclusions are drawn as t...