Abstract
Exciton harvesters based on blue phosphorescent molecules bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic) doped in 4,4′,4″-tris(carbazol-9-yl)triphenylamine (TCTA) are used to enhance the performance of inverted quantum dot light-emitting diodes (QD-LEDs). In the proposed device structures, electrons that leak to the TCTA layer can be effectively captured by FIrpic and subsequently can recombine in the TCTA:FIrpic layer. The harvested energy is then nonradiatively transferred to the adjacent QDs via Forster dipole–dipole coupling mechanism. Because of effective harvest of leaked electrons and complete energy transfer from FIrpic to the adjacent QDs, the demonstrated QD-LEDs exhibit pure QD emission, higher efficiency (1.62-fold improvement), and longer lifetime.
Published Version
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