| Summary: | 博士 === 國立成功大學 === 光電科學與工程學系 === 101 === Part I:
This thesis is primarily concerned with benzo[k]fluoranthene derivatives as active layer in deep blue OLEDs, where the active layer use of two different ways, benzo[k]fluoranthene derivatives as dopant in host material and pristine benzo[k]fluoranthene derivatives film. The optical properties, electrical properties, and the reason of spectra shifted are discussing in benzo[k]fluoranthene derivatives-based OLEDs.
The fluorescent emission spectra of benzo[k]fluoranthene derivatives can be modulated by tuning the substituents and the conjugated length of the emissive core. The electroluminescence spectra of these excellent deep blue OLEDs are quite stable in any bias conditions.
Benzo[k]fluoranthene derivatives use these materials directly as the non-doped active layer to fabricate deep blue- (420-460 nm) to green- (480-580 nm) emissive OLEDs. Experimental results indicate that benzo[k]fluoranthene derivatives with different substituents in pristine films have a wide range and strong intensity of the luminescence spectra. The substituents of benzo[k]fluoranthene derivatives modulate the lifetime of the excited state and PL spectra of excitonic, excimer or both emissions in the solid state.
Part II:
Here we focus on the interface of CGLs in tandem type OLEDs. The experimental results point out there is a large barrier in CGL interface, which imply there are seriously charge accumulation after charge generation in p-type layer of CGL. This barrier seriously reduces the operating stability and increase the operating voltage of tandem OLEDs. Inserting ultra-thin high work function metal at the interface of CGL can improve the CGL that are more close to an ideal CGL. The mechanism of metal thin film modified CGLs is ascribed to the gap states of metal cluster decrease the interface barrier and reduces the charge accumulation in CGL.
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