This work demonstrates a dual-frequency polymer-stabilized liquid crystal pi cell with zero bias and a short response time. The high curing voltage and low curing intensity give the cell a low dark state and a high bright state, such that the transmittance against the applied voltage curve is steep. The response time is under 1ms and is independent of monomer concentration because a strong electric torque is exerted on the liquid crystals. The cell is useful in field-sequential color systems, and the low operating voltage of ∼5V makes the cell compatible with conventional thin film transistor driving voltages.

This paper reports the fabrication and evaluation of light-emitting diodes using polyfluorene derivatives as emitter, which cover the entire visible spectral range. Depending on the composition of the copolymers, red (emission peak at 656 nm), green (488 nm) and blue (428 nm) emission was obtained without any excimer formation. The optimization of the device performances has been realized using a multilayered configuration which involves a spin-coated poly(ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDT-PSS) thin film on the ITO anode and an ultrathin lithium fluoride layer next to the Al cathode. These two layers improve the efficiency of the charge injection. Combining this device configuration with some additional charge-transporting molecules, luminances in the range of 50-300 cd m −2 have been obtained.

Recent (HI, x n ) data on rotational Yb and Hf nuclei are used to describe the motivations and techniques for pushing discrete-line spectroscopy to the realm of the weakly populated yrast and non-yrast states. Three aspects of these studies are discussed: extraction of moments of inertia in different aligned bands, observation and understanding of high-frequency band crossings, and dependence of feeding patterns on nuclear structure.