RESUMO
Small organic molecules with finely tunable physical properties are highly desired for the fabrication of low-cost and high-performance organic electronic devices. In this work, the syntheses of a series of T-shaped NBN-embedded dibenzophenalene derivatives through the formation of a key brominated intermediate in a stoichiometrically controlled reaction are presented. The geometric and electronic structures of these T-shaped molecules can be simply tailored by attaching substituents along the direction perpendicular to the molecular main backbones, resulting in desirable physical properties, such as high thermal stability with a decomposition temperature of more than 350 °C, and intensive blue luminescence with a quantum yield up to 0.62. Organic light-emitting diode devices fabricated with such molecules as the emitting layer release pure blue light with CIE (0.16, 0.12).
RESUMO
In this study, we have synthesized the molybdenum sulfide quantum dots (MoS2 QDs) and zinc sulfide quantum dots (ZnS QDs) and demonstrated a highly efficient green phosphorescent organic light-emitting diode (OLED) with hybrid poly (3,4-ethylenedioxythiophene)/poly (styrenesulfonate) (PEDOT:PSS)/QDs hole injection layer (HIL). The electroluminescent properties of PEDOT:PSS and hybrid HIL based devices were explored. An optimized OLED based on the PEDOT:PSS/MoS2 QDs HIL exhibited maximum current efficiency (CE) of 72.7 cd A-1, which shows a 28.2% enhancement as compared to counterpart with single PEDOT:PSS HIL. The higher device performance of OLED with hybrid HIL can be attributed to the enhanced hole injection capacity and balanced charge carrier transportation in the OLED devices. The above analysis illustrates an alternative way to fabricate the high efficiency OLEDs with sulfide quantum dots as a HIL.