The pressure P derivative dTc/dP of the Curie temperature Tc, the linear magnetoslriclion All1 at 4.2 K. the lattice parameters a and c as functions of temperature T and the high4emper;uui-e paramagnetic susceptibility x of CrTe have been measured. The value of dTc/dP is found to be -7.0 1 0 . 2 K kbar-'. Thermal expansion anomalies of both a and c below Tc = 350 k 2 K are observed upon moling. The inverse of x above Tc shows a bRak at about 600 K. The field derivative d(Al/l)/dH in the interval 40 kOe c H c 78 kCe at 4.2 K is found to be 1.2 x Oe-'. The mulls obtained are discussed on the basis of an appropfiate thermodynamic relation. logelher with the reponed results on dTcldP and the thermal expansions of Crl-sTe.

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We developed an active matrix driving organic light-emitting diode (OLED) panel on a glass substrate using two organic thin-film transistors (OTFTs) per pixel, a switching OTFT and a driving OTFT. The OTFTs are bottom contact structures with the high-dielectric constant gate insulator tantalum oxide (Ta2O5, relative dielectric constant of 23) produced by anodization in ammonium adipate solution and with pentacene as the active layer. The W/L (where W and L are the OTFTs channel width and length, respectively) was 400 µm/10 µm for the switching OTFTs and 680 µm/10 µm for the driving OTFTs. The characteristics of the OTFTs were improved by treating the Ta2O5 surface with hexamethyldisilazane (HMDS), so that the field-effect mobility was 2.0×10-1 cm2 V-1 s-1 and the current on/off ratio was 105. A green phosphorescent dopant, tris(2-phenylpyridine)iridium [Ir(ppy)3], was used for the OLED layer. The panel had 8×8 pixels and the aperture ratio was 27%. We confirmed a 16-gray-scale representation and a luminance of 400 cd/m2.

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