The blue organic light emitting diodes (OLED) based on anthracene derivatives (ADN) doped with distryrylarylene derivatives (BCzVB and DSA-ph) were presented. The device of ADN doped with BCzVb shows high color purity (x=0.146, y=0.162) with maximum luminance 11600 cd/m2 (15V), current efficiency 2.8 cd/A, while the device of ADN doped with DSA-ph exhibits a sky blue with as high as efficiency 8.29 cd/A, both have a flat efficiency vs current density responses. A typical blue device of ADN doped with TBPe is used for comparison, which gives greenish blue and a stronger current-induced flyorescence quenching. Three kinds of White organic light emitting devices (WOLED) with different dopants and doping sites were constructed. The cell with a single-doped red dye in the light emitting layer (EML)(single-doped) and the cell with both red and blue dyes doped in a single EML (double-doped as well as the cell with red and blue dyes doped in EML and a green dye in another layer (triple-doped). The triple-doped cell shows much higher performance than other two cells: maximum luminance 21200cd/m2, 1026 cd/m2 at driving current 20mA/cm2, efficiency 6cd/A and a half lifetime over 22245h were reached. A passive display features 102x64 pixels with pixel size of 0.25x0.25mm2 pixel pitch 0.08mm, luminance 100 cd/m2 at driving duty 1/64, and power consumption of 0.6W was constructed.
Two kinds of voltage-tunable-color triple layer organic light emitting diodes consisted of styryltriphenyamine SA and 8- hydroxyquinoline aluminum chalet Alq3 or laser dye DCM doped Alq3 as emission layers and oxadizole PBD as carrier confinement layer have been fabricated. They emit both from SA and Alq3 or DCM doped Alq3 and their emission color dependent on the applied voltage. The ratios of blue from SA and green or orange-red from Alq3 or Alq3:DCM increased with the increasing of applied voltage. Brightness current characteristic has been invest9iEnergy models have been assumed and the EL behaviors are explained.
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