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(a) Hole and (b) electron mobilities ( and , respectively) vs the square root of the applied electric field of composite films prepared with five NPB volume fractions . ∎, ; 엯, ; ▵, ; ▿, ; ◆, .
Carrier mobility of hole (□) and electron (●) vs NPB volume fraction in composite films at the applied electric field of .
Current density vs NPB volume fraction of the electroluminescence devices with a mixed layer at a drive voltage of .
(a) Electroluminescence (EL) spectra and (b) luminance vs current density characteristics of devices with a mixed layer of different NPB volume fractions . ∎, ; 엯, ; ▵, ; ▿, ; ◆, . The EL spectra were recorded at a drive voltage of . .
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