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(Color online) UV-Vis absorption spectra of undoped NPB and NPB:15% films deposited on quartz substrate.
(Color online) (a) Current density–voltage–luminance characteristics and (b) power efficiency–current density of the OLEDs with .
(Color online) Lifetime of the OLEDs consisting of structures measured at .
(Color online) The current density–voltage characteristics of the hole-only devices with NPB:15% , NPB:15% , and undoped NPB HTL .
(Color online) Optical micrographs of the undoped NPB samples: (a) before and (b) after annealing at ; and of NPB:15% samples: (c) before and (d) after annealing at .
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