Temperature Dependence of Current Transport and Electroluminescence in Vacuum Deposited Organic Light Emitting Devices

Abstract

We inserted pieces of metal foils (AI and Au) into a metal Berthelot tube together with water or xylene to investigate whether corrosion of metals limits the achievement of negative pressure. For the test using AI foil with water, the negative pressure rose to -30 bar but diminished almost to zero after 250 cycles, whereas those for all the others increased with the number of temperature cycles.Corrosive reaction of AI with water yielded HP gas and the resulting increase in the

Electron-only diodes of poly(dialkoxy-p-phenylene vinylene) using hole-blocking bottom electrodes

“…The strong dependence of the electron current on applied voltage and sample thickness was in accordance with an exponential distribution of trapping sites in energy. Such an exponential trapping model had also been proposed by Burrows and Forrest 8,9 for the electron transport in aluminum hydroxyquinoline ͑Alq 3 ͒. In a more recent study, using thermally stimulated currents, the reduced electron currents were also attributed to traps, 10 which were related to the presence of oxygen.…”

Trap-limited electron transport in disordered semiconducting polymers

“…1 The strong dependence of the electron current on applied voltage and sample thickness at room temperature was approximated with an exponential distribution of trapping sites in energy. Such an exponential trapping model had also been proposed by Burrows and Forrest 7 and Shen et al 8 for the electron transport. Later, an alternative explanation for the reduced electron current in PPV-based electron-only devices, based on a trap-free SCLC with an intrinsically low electron mobility, 9 has been reported.…”

Effect of Gaussian disorder on the voltage dependence of the current density in sandwich-type devices based on organic semiconductors

“…In particular, the method can be extended straightforwardly to systems containing trap states. Such an extension may be envisaged to find practical applications to dye-doped hostguest systems in, e.g., small-molecule OLEDs and to trapcontrolled hole 29 and electron [30][31][32] transport through polymers.…”