Exciton‐Adjustable Interlayers for High Efficiency, Low Efficiency Roll‐Off, and Lifetime Improved Warm White Organic Light‐Emitting Diodes (WOLEDs) Based on a Delayed Fluorescence Assistant Host,Advanced Functional Materials

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Exciton‐Adjustable Interlayers for High Efficiency, Low Efficiency Roll‐Off, and Lifetime Improved Warm White Organic Light‐Emitting Diodes (WOLEDs) Based on a Delayed Fluorescence Assistant Host
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-15 , DOI: 10.1002/adfm.201706922
Zhiheng Wang ₁ , Xiang-Long Li ₁ , Zerui Ma ₁ , Xinyi Cai ₁ , Chengsong Cai ₁ , Shi-Jian Su ₁

Affiliation

Recently, a new route to achieve 100% internal quantum efficiency white organic light‐emitting diodes (WOLEDs) is proposed by utilizing noble‐metal‐free thermally activated delayed fluorescence (TADF) emitters due to the radiative contributions of triplet excitons by effective reverse intersystem crossing. However, a systematic understanding of their reliability and internal degradation mechanisms is still deficient. Here, it demonstrates high performance and operational stable purely organic fluorescent WOLEDs consisting of a TADF assistant host via a strategic exciton management by multi‐interlayers. By introducing such interlayers, carrier recombination zone could be controlled to suppress the generally unavoidable quenching of long‐range triplet excitons, successfully achieving remarkable external quantum efficiency of 15.1%, maximum power efficiency of 48.9 lm W⁻¹, and extended LT50 lifetime (time to 50% of initial luminance of 1000 cd m⁻²) exceeding 2000 h. To this knowledge, this is the first pioneering work for realizing high efficiency, low efficiency roll‐off, and operational stable WOLEDs based on a TADF assistant host. The current findings also indicate that broadening the carrier recombination region in both interlayers and yellow emitting layer as well as restraining exciplex quenching at carrier blocking interface make significant roles on reduced efficiency roll‐off and enhanced operational lifetime.

中文翻译：

基于延迟荧光助手主机的激子可调节中间层，可实现高效率，低效率滚降和使用寿命改善的暖白色有机发光二极管（WOLED）

最近，由于三重态激子通过有效反向系统间的辐射作用，利用无贵金属的热激活延迟荧光（TADF）发射器，提出了一种实现100％内部量子效率的白色有机发光二极管（WOLED）的新途径。穿越。但是，对其可靠性和内部降级机制的系统了解仍然不足。在这里，它通过多层夹层的战略激子管理，展示了由TADF辅助主体组成的高性能和可操作稳定的纯有机荧光WOLED。通过引入这样的中间层，可以控制载流子复合区，以抑制通常无法避免的长程三重态激子的猝灭，从而成功实现了15.1％的出色外部量子效率，^-1并延长了LT50寿命（达到初始亮度1000 cd m ^-2的50％的时间）超过2000 h。据此，这是基于TADF辅助主机实现高效率，低效率滚降和可操作稳定WOLED的首个开创性工作。目前的发现还表明，拓宽中间层和黄光发射层中的载流子复合区域，以及抑制载流子阻断界面处的激基复合物猝灭，在降低效率下降和延长使用寿命方面都起着重要作用。

更新日期：2018-01-15

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