Study of optoelectronic energy bands and molecular energy levels of tris (8-hydroxyquinolinate) gallium and aluminum organometallic materials from their spectroscopic and electrochemical analysis

Determination of the optical band gap of Alq3 and its derivatives for the use in two-layer OLEDs

“…By taking the natural logarithms and derivation of Eq. (4) the equation can be rearrange as [20,21]:…”

Morphology Impact on the Absorption Behaviour of Post-Thermally Treated Tris(8-Hydroxyquinoline) Gallium Films

“…Two main peaks were found for the untreated film; the first peak is at photon energy of about 3.14 eV, while the second one is located in the ultraviolet region with relatively broad and intense at about 4.67 eV. These peaks were assigned to the existence of electronic transitions from orbital energy bands, respectively [9]. One can observe that increased annealing temperature has made the intensity of visible band to be lowered in opposite trend to that of the ultraviolet band.…”

“…It was reported that the utilization of Gaq3 in OLEDs has improved the device performance in comparison to that of the Alq3 based ones [5]. Investigations on the Gaq3 properties received considerable attention in both theoretical and practical aspects [6][7][8][9]. Improvement in the Gaq3 properties is crucial for its application in OLED and/or OSC devices.…”

Oxinate-Aluminum(III) Nanostructure Assemblies Formed via In-situ and Ex-situ Oxination of Gold-Self-Assembled Monolayers Characterized by Electrochemical, Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy, and X-ray Photoelectron Spectroscopy Methods

“…The vibrations involving C=C/C=N stretching + CH bending of the quinoline fragments of 8HQ are observed at 1340 and 1390 cm −1(Fig. 4, curve c)[66,67]. (d) The observed bands in the ATR-FTIR spectrum of the Au-MPA-5A8HQ surface are almost disappeared by adsorption of Al(III) ions (Fig.…”

“…4 curve b) [65].In addition, the bands appeared at 1270 and 1130 cm −1(Fig. 4, curve b) are assigned to a CH/CC=N bending + C=N stretching vibrations and the peak observed at 862 cm 1 is attributed to the out-of-plane CH wagging vibrations[66,67]. The bands at 1423 and 1514 cm −1 correspond to C=C/C=N stretching + CH bending vibrations associated with both the pyridyl and phenyl groups in 8HQ.…”