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首页> 外文期刊>Advanced Functional Materials >A Multifunctional Bipolar Luminogen with Delayed Fluorescence for High-Performance Monochromatic and Color-Stable Warm-White OLEDs
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A Multifunctional Bipolar Luminogen with Delayed Fluorescence for High-Performance Monochromatic and Color-Stable Warm-White OLEDs

机译：用于高性能单色和颜色稳定的暖白OLED的具有延迟荧光的多功能双极发光剂。

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Increasing exciton utilization and reducing exciton annihilation are crucial to achieve high performance of organic light-emitting diodes (OLEDs), which greatly depend on molecular engineering of emitters and hosts. A novel luminogen (SBF-BP-DMAC) is synthesized and characterized. Its crystal and electronic structures, thermal stability, electrochemical behavior, carrier transport, photoluminescence, and electroluminescence are investigated. SBF-BP-DMAC exhibits enhanced photoluminescence and promotes delayed fluorescence in solid state and bipolar carrier transport ability, and thus holds multifunctionality of emitter and host for OLEDs. Using SBF-BP-DMAC as an emitter, the nondoped OLEDs exhibit maximum electroluminescence (EL) efficiencies of 67.2 cd A(-1), 65.9 lm W-1, and 20.1%, and the doped OLEDs provide maximum EL efficiencies of 79.1 cd A(-1), 70.7 lm W-1, and 24.5%. A representative orange phosphor, Ir(tptpy)(2)acac, is doped into SBF-BP-DMAC for OLED fabrication, giving rise to superior EL efficiencies of 88.0 cd A(-1), 108.0 lm W-1, and 26.8% for orange phosphorescent OLEDs, and forward-viewing EL efficiencies of 69.3 cd A(-1), 45.8 lm W-1, and 21.0% for two-color hybrid warm-white OLEDs. All of these OLEDs can retain high EL efficiencies at high luminance, with very small efficiency roll-offs. The outstanding EL performance demonstrates the great potentials of SBF-BP-DMAC in practical display and lighting devices.
机译：激子利用率的提高和激子an灭的减少对于实现有机发光二极管（OLED）的高性能至关重要，而有机发光二极管（OLED）很大程度上取决于发射极和主体的分子工程。合成并表征了新型发光剂（SBF-BP-DMAC）。研究了其晶体和电子结构，热稳定性，电化学行为，载流子传输，光致发光和电致发光。 SBF-BP-DMAC表现出增强的光致发光特性，并在固态和双极性载流子传输能力方面促进延迟的荧光，因此具有OLED发射体和主体的多功能性。使用SBF-BP-DMAC作为发射极，未掺杂的OLED的最大电致发光（EL）效率为67.2 cd A（-1），65.9 lm W-1和20.1％，掺杂的OLED的最大EL效率为79.1 cd A（-1），70.7流明的W-1和24.5％。将代表性的橙色磷光体Ir（tptpy）（2）acac掺杂到SBF-BP-DMAC中用于OLED的制造，从而产生了88.0 cd A（-1），108.0 lm W-1和26.8％的出色EL效率。对于橙色磷光OLED而言，EL效率为69.3 cd A（-1），45.8 lm W-1和21.0％（对于两种颜色的混合暖白色OLED）。所有这些OLED都可以在高亮度下保持高EL效率，并且效率下降非常小。出色的EL性能证明SBF-BP-DMAC在实际的显示和照明设备中具有巨大的潜力。

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