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Non-doped phosphorescent organic light-emitting devices with an exciplex forming planar structure for efficiency enhancement
摘要： Organic light-emitting devices (OLEDs) consisting of a non-doped phosphorescent dye that inserted in an exciplex forming planar structure have been fabricated, and the thickness of ultrathin phosphor layer is optimized to achieve high efficiency. The results showed that OLEDs based on the exciplex interface and a 0.5 nm thick phosphorescent dye have a power efficiency, a current efficiency, and an external quantum efficiency of 37.4 lm/W, 40.5 cd/A, and 14.3%, respectively, which are almost two-folds higher than those with non-exciplex interface devices. Meanwhile, the efficiency roll-off is significantly suppressed. These improved device performances are attributed to the elimination of triplet energy leakage from exciplexes to constituting molecules, efficient energy up conversion of triplet exciplexes and complete host-guest F?rster energy transfer. These results will provide an easily-fabricated and time-saving approach for high-performance OLEDs.
关键词： non-doped,planar structure,Organic light-emitting device (OLED),exciplex,phosphorescent dye
更新于2025-09-23 15:22:29
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A Novel Series of Thermally and Electrically Stable Hole-Transporters End-Capped by [1]Benzothieno[3,2- <i>b</i> ][1]benzotiophenes for Organic Light-Emitting Devices
摘要： A novel series of hole-transporters for organic light-emitting devices (OLEDs) was developed with the aim of high thermal and electrical stability. This was achieved by introducing [1]benzothieno[3,2-b][1]benzothiophene (BTBT) moieties as end-cap groups. These BTBT-end-capped hole-transporters exhibited superior thermal stability with a glass transition temperature (Tg) of over 150 °C and high electrical stability in green phosphorescent OLEDs at a high brightness of over 8000 cd m–2 (current density: 15 mA cm–2).
关键词： Organic light-emitting device (OLED),Hole-transporter,Arylamine derivative
更新于2025-09-23 15:22:29