17 research outputs found
Low-temperature vibration characteristics in InSe single crystals intercalated by Ni
The theoretical and experimental study of low-temperature heat capacity of InSe intercalated by nickel as a
function of temperature has been carried out in range 0.3–30 K. The effect of intercalation by nickel on phonon
heat capacity (Cph) of InSe has been investigated. Two peaks observed in relative change of phonon specific heat
(∆Cph/Cph) suggested non-Debye excess in heat capacity for all intercalated NixInSe systems
Studies of the structure of defects in In4Se3 crystals by small-angle neutron scattering
Modification of current-voltage characteristics of planar organic systems by nm-thick copper phthalocyanine or perylene dye interlayer
Efficient “Warm-White” OLEDs Based on the Phosphorescent bis-Cyclometalated iridium(III) Complex
The starburst carbazole derivative
and phosphorescent bis-cyclometalated
iridium(III) complex (<b>IC2</b>) were used for the preparation
of multilayered “warm-white” organic light-emitting
diodes (OLEDs), the emission spectra of which are modulated by the
thickness of the phosphorescent layer. It was shown that the electroluminescence
spectra of the fabricated devices are more extended into the visible
region compared with the photoluminescence spectra of both component
materials. The observed extension of the electroluminescence spectra
can be assigned to the phosphorescent emission of the low-energy exciplex
formed at the interface of the emissive layers. The quantum-chemical
calculations performed by the DFT and (TD) DFT methods support the
formation of the low-energy triplet exciplex at the interface of the <b>IC2</b> layer and the neighboring layer of the starshaped carbazole-based
compound, (4,4′,4″-tris[3-methylphenyl(phenyl)amino]
triphenylamine, tri(9-hexylcarbazol-3-yl)amine (<b>THCA)</b>. Indeed, the triplet excited state of such bimolecular complex corresponds
to intermolecular charge transfer between <b>IC2</b> and <b>THCA</b>. The experimentally observed electrophosphorescence of
these exciplexes is induced by strong spin–orbit coupling in
the <b>THCA:IC2</b> complexes due to the Ir(III) heavy atom
effect. With dependence on the iridium(III)-complex film thickness
(5–9 nm), the CIE coordinates changed from (0.41, 0.41) to
(0.52, 0.47), corresponding to the warm white and orange color. The
brightness of the fabricated OLEDs at the 15 V bias was in the range
from 500 to 6000 cd/m<sup>2</sup>