Abstract
Thermally stimulated processes have been studied in thin films of phenanthroline derives to describe the states that had been localized. Ultraviolet Photoelectron Spectroscopy had checked out before thin films of new pyrrolo[l,2-a][l,10] phenanthroline derivatives [1], in order to further applications in optoelectronic devices. The investigated compounds have an electronic band structure which is due to the substituent (R=NO2, Cl) induced transformations of molecular orbitals. Thermally stimulated discharge currents (TSDC) attested dipolar and charge transport mechanisms. Each TSDC peak has been assigned to elementary processes that are different utilizing in addition dielectric spectroscopy (DES), and the mean trap depths have been approximated from thermally stimulated luminescence (TSL) curves.
Highlights
The candidates that are promising for the technology of solid-state devices, organic light emitting diodes (OLEDs) [1] in particular, are the Pyrrolo[1,2-a][1,10]phenanthroline (RA) derivatives
The same figures show the theoretical simulations for different incident photon energies of both compounds
Between experimental findings and theoretical results, a good agreement had been found, and, through this, each UPS peak has related to the specific contributions of distinct groups of occupied molecular orbitals [15,16,17,18]
Summary
The candidates that are promising for the technology of solid-state devices, organic light emitting diodes (OLEDs) [1] in particular, are the Pyrrolo[1,2-a][1,10]phenanthroline (RA) derivatives. With a temperature range between 75 and 450 K, we performed the TSL measurements. UPS spectra of compounds RA1(a) and RA2(b) is being shown by Figs. 2. the same figures show the theoretical simulations for different incident photon energies of both compounds.
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