A simple and efficient method to improve the internal and external quantum efficiency of phosphorescent organic light-emitting devices (PhOLEDs) is demonstrated, i.e., combining the localized surface plasmon (LSP) and optical scattering effects by introducing gold nanoparticles (NPs) coated by (named as ). The effects of LSP and optical scattering on PhOLEDs are studied. The lifetime of the triplet exciton in the device is modified by surface plasmon coupling induced by NPs, which results in increased internal quantum efficiency of the NP-containing devices. The optical scattering effect induced by NPs enhances the light outcoupling efficiency of the PhOLEDs and is demonstrated by measuring the angularly resolved photoluminescence. As a result, a PhOLED with 101% improved efficiency and 21% reduced efficiency roll-off is achieved using the composite HTL.
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