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Lifetime testing results are reported for organic light emitting diodes (OLEDs) having the structure ITO (anode)/N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD)/tris-(8-hydroxyquinoline)aluminum (AlQ)/Al (cathode) and operated using dc and pulsed waveforms for comparison. In ambient atmosphere non-encapsulated devices show a lifetime of about 70h in pulsed operation at an initial...
Lifetime measurement results on organic light emitting diodes (OLEDs) are presented and analyzed. The drive voltage tends to increase and the luminance tends to decrease with operating time. Upon the reversal of the polarity of the external field, the voltage trends are reversed almost completely and the luminance trends undergo weak changes. It is suggested that mobile ions can be the cause of the...
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