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(a) Chemical structures of DBP and DBzA, (b) present red OLEDs architecture, and (c) the HOMO and LUMO levels of the materials with respect to vacuum level.
Voltage-current characteristics for devices A–E. Inset: EL spectra of devices B and D.
Voltage-current characteristics for the hole- and electron-only devices.
Luminance decay curves at a current density of for devices D and E, and their voltage increases (inset).
Employed materials and performances for devices A–E, [ layer -transporting layer ] at a current density of .
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