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Normalized absorption spectrum of thin film and PL spectra of CBP and NPB. Inset: molecular structure of .
Luminance–bias voltage–current characteristics of devices A, B, and C.
HOMO and LUMO energy levels of the used materials for devices A, B, and C.
Normalized EL spectra of device A at varied driving voltages (a) and three devices at a forward bias of (b).
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