Transient behavior for an organic thin film electroluminescence (EL) cell with ITO/triphenylamine derivative/tris (8-hydroxyquinolino) aluminum (Alq)/Mg:Ag structure was observed by short voltage pulse measurements. The EL response was of the order of 10−7 s, and faster than that previously measured by Tang et al. [J. Appl. Phys. 65, 3610 (1989)]. In these measurements, we could observe carrier transit time. Then we concluded this carrier transit time should be attributed to that of electrons in Alq layer and the electron mobility of (5±2)×10−5 cm2/V s was obtained above the electric field of 1 MV/cm.
Electroluminescence of organic light emitting diodes with a thick hole transport layer composed of a triphenylamine based polymer doped with an antimonium compound Electroluminescence from multilayer organic lightemitting diodes using poly(methylphenylsilane) as hole transporting material
We report that organic electroluminescence devices with a hole transporting emitting layer composed of distyrylarylene derivatives realized highly efficient and bright emission in the blue-green region. Luminous efficiency was obtained to be 2.1 lm/W in the low-luminance region (135 cd/m2) using an indium tin oxide/emitting layer/electron transporting layer/Mg:Ag structure. The external quantum efficiency was estimated to be about 1.5%. The highest luminance was obtained to be 4000 cd/m2 for the device.
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