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首页> 外文期刊>Advanced Functional Materials >Thermally Activated Delayed Fluorescence Material as Host with Novel Spiro-Based Skeleton for High Power Efficiency and Low Roll-Off Blue and White Phosphorescent Devices
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Thermally Activated Delayed Fluorescence Material as Host with Novel Spiro-Based Skeleton for High Power Efficiency and Low Roll-Off Blue and White Phosphorescent Devices

机译：热活化延迟荧光材料作为主体，具有新型基于螺线的骨架，可实现高功率效率和低滚降的蓝色和白色磷光器件

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a AbstractEfficiency roll-off in blue organic light-emitting diodes especially at high brightness still remains a vital issue for which the excitons density-dependent mechanism of host materials takes most responsibility. Additionally, the efficiency roll-off leads to high power consumption and reduces the operating lifetime because higher driving voltage and current are required. Here, by subtly modifying the triphenylamine to oxygen-bridged quasi-planar structure, a novel thermally activated delayed fluorescence type blue host Tri-o-2PO is successfully developed. Efficiency roll-off based on Tri-o-2PO is ultralow with external quantum efficiency (EQE) just dropping by around 2% in the high luminance range from 1000 cd m(-2) to 10 000 cd m(-2). As expected, low turn-on voltage (approximate to 2.9 V) of device is also achieved, which is close to the theory limit value (approximate to 2.62 V). Super-high power efficiency (approximate to 60 lm W-1) and EQE (>22%) are also achieved when utilizing Tri-o-2PO as host. Furthermore, two-color warm-white light with CIE of (0.45, 0.43) and correlated color temperature of 2921 K is also fabricated and a champion EQE of 21% is delivered. These excellent performances prove the strategy of bridging the triphenylamine to reduce Delta E-st is validated and suggest the great potential of this novel skeleton.
机译：摘要尤其是在高亮度下，蓝色有机发光二极管的效率下降仍然是一个至关重要的问题，基质材料的激子密度依赖性机理是其中最重要的问题。此外，由于需要更高的驱动电压和电流，效率下降会导致高功耗并缩短工作寿命。在这里，通过将三苯胺微妙地修饰成氧桥联的准平面结构，成功开发了一种新型的热活化延迟荧光型蓝色主体Tri-o-2PO。基于Tri-o-2PO的效率下降非常低，在从1000 cd m（-2）到10000 cd m（-2）的高亮度范围内，外部量子效率（EQE）仅下降了约2％。如预期的那样，还实现了器件的低导通电压（约2.9 V），接近理论极限值（约2.62 V）。当使用Tri-o-2PO作为主机时，还可以实现超高功率效率（大约60 lm W-1）和EQE（> 22％）。此外，还制作了CIE为（0.45，0.43）和相关色温为2921 K的双色暖白光，并提供了21％的最佳EQE。这些优异的性能证明了桥接三苯胺以减少Delta E-st的策略得到了验证，并表明了这种新型骨架的巨大潜力。

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  • 来源
    《Advanced Functional Materials》 |2016年第43期|7929-7936|共8页
  • 作者

    Wang Ya-Kun; Sun Qi; Wu Sheng-Fan; Yuan Yi; Li Qian; Jiang Zuo-Quan; Fung Man-Keung; Liao Liang-Sheng;

  • 作者单位

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

    Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China;

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