首页> 美国卫生研究院文献>Chemical Science >Dendronized delayed fluorescence emitters for non-doped solution-processed organic light-emitting diodes with high efficiency and low efficiency roll-off simultaneously: two parallel emissive channels
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Dendronized delayed fluorescence emitters for non-doped solution-processed organic light-emitting diodes with high efficiency and low efficiency roll-off simultaneously: two parallel emissive channels

机译:用于高效率和低效率滚降的未掺杂溶液处理的有机发光二极管的Dendronized延迟荧光发射器:两个平行的发射通道

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摘要

We have developed two new carbazole-dendronized emitters based on a green emissive thermally activated delayed fluorescence (TADF) core. Both dendrimers possess excellent thermal stability, good solution processability, and an obvious TADF feature. Non-doped OLEDs based on the emitters formed by a solution process exhibit a maximum external quantum efficiency (EQE) of 13.8%. Remarkably, the EQE remains as high as 13.3% at the high luminance of 1000 cd m–2. To the best of our knowledge, this is one of the highest EQE values for dendrimer-based fluorescent OLEDs, which nearly harvest all of the generated excitons and exhibit a considerably low loss of EQE estimated from 1000 to 5000 cd m–2. Furthermore, we reveal a new emissive approach to utilize the excitons by a combination of both TADF and exciplex emission.
机译:我们已经开发了基于绿色发射热激活延迟荧光(TADF)核心的两个新的咔唑-树枝化的发光体。两种树枝状聚合物均具有出色的热稳定性,良好的溶液加工性和明显的TADF功能。基于通过溶液工艺形成的发射极的非掺杂OLED的最大外部量子效率(EQE)为13.8%。值得注意的是,在1000 cd m –2 的高亮度下,EQE仍高达13.3%。据我们所知,这是基于树枝状聚合物的荧光OLED的最高EQE值之一,它几乎捕获了所有产生的激子,并且表现出相当低的EQE损失,估计从1000到5000 cd m 。此外,我们揭示了通过TADF和激基复合物发射相结合来利用激子的新发射方法。

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