磷光敏化的热激活延迟荧光有机发光二极管，具有理想的深蓝色器件性能<a href="#fn1" title="提供电子补充信息（ESI）。参见DOI：10.1039 / c9tc02746g">†</a>,Journal of Materials Chemistry C

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磷光敏化的热激活延迟荧光有机发光二极管，具有理想的深蓝色器件性能 †
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-07-02 00:00:00 , DOI: 10.1039/c9tc02746g
Kyung Hyung Lee _{1,

2,

3,

4} , Jun Yeob Lee _{1,

2,

3,

4}

Affiliation

设计了磷光敏化的热激活延迟荧光（PSTADF）有机发光二极管（OLED），以解决掺有硼衍生TADF发射体的深蓝色热激活延迟荧光（TADF）OLED中的低最大亮度和高亮度下的严重效率下降。。在TADF OLED的常规设备结构中添加了深蓝色磷光发射体作为敏化剂，以通过Förster能量转移过程增加TADF发射体的单重态激子的贡献。通过PSTADF装置中磷光敏化剂的单重态激子收集功能，可以显着缓解原始TADF装置的严重效率下降。应用了几种蓝色磷光发射体作为敏化剂，并建立了对磷光敏化剂的要求。24.8％的高外部量子效率，在1000 cd m时抑制了效率下降^-2和深蓝色坐标（0.131，0.107）是从深蓝色PSTADF OLED输出的。此外，PSTADF机制将深蓝色OLED的寿命延长了17倍以上，从而使深蓝色OLED的使用寿命超过了1000小时。这项工作报告了y颜色坐标低于0.15的深蓝色OLED的效率超过20％，寿命超过1000小时。

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Phosphor sensitized thermally activated delayed fluorescence organic light-emitting diodes with ideal deep blue device performances†

Phosphorescence sensitized thermally activated delayed fluorescent (PSTADF) organic light-emitting diodes (OLEDs) were devised to resolve the low maximum luminance and serious efficiency drop at high brightness in deep blue thermally activated delayed fluorescent (TADF) OLEDs doped with a boron derived TADF emitter. A deep blue-emitting phosphorescent emitter was added in the conventional device structure of TADF OLEDs as a sensitizer to increase the contribution of the singlet excitons of the TADF emitter by the Förster energy transfer process. The serious efficiency roll-off of the original TADF device was noticeably alleviated in the PSTADF device by the singlet exciton harvesting function of the phosphorescent sensitizer. Several blue phosphorescent emitters were applied as the sensitizer and the requirement of the phosphorescent sensitizer was established. A high external quantum efficiency of 24.8%, suppressed efficiency drop at 1000 cd m⁻², and deep blue color coordinates of (0.131, 0.107) were outputs from the deep blue PSTADF OLEDs. Moreover, the PSTADF mechanism extended the lifetime of the deep blue OLEDs by more than 17 times, which resulted in more than 1000 h lifetime in the deep blue OLEDs. This work reports a high efficiency of over 20% and lifetime longer than 1000 h in deep blue OLEDs with the y color coordinate below 0.15.

更新日期：2019-07-02

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