Efficient Exciplex‐based Green and Near‐Infrared Organic Light‐Emitting Diodes Employing a Novel Donor‐Acceptor Type Donor,Chemistry - An Asian Journal

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Efficient Exciplex‐based Green and Near‐Infrared Organic Light‐Emitting Diodes Employing a Novel Donor‐Acceptor Type Donor
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-10-13 , DOI: 10.1002/asia.202001091
Juewen Zhao ₁ , Jun Ye ₂ , Xiaoyang Du ₁ , Caijun Zheng ₁ , Zeyu He ₁ , Haoyu Yang ₁ , Ming Zhang ₁ , Hui Lin ₁ , Silu Tao ₁

Affiliation

Widely investigated thermally activated delayed fluorescence (TADF) can be achieved by intramolecular and intermolecular charge transfer between an electron donor and electron acceptor which corresponds to a TADF material and exciplex, respectively. However, the development of efficient organic light‐emitting diodes (OLEDs) based on an exciplex lags far behind the development of those based on efficient TADF materials. In this work, a novel D‐A type electron donor TPAFPO was designed and synthesized. TPAFPO:PO‐T2T exhibits a small ΔE_ST of 79 meV and significant delayed emission, demonstrating TADF characteristics. OLEDs based on TPAFPO:PO‐T2T exhibit a low turn‐on voltage of 2.4 V and high an EQE value of 17.0%. Besides, NIR OLEDs utilizing TPAFPO:PO‐T2T as host exhibit a turn‐on voltage of 3.0 V and high EQE of 9.2% with a NIR emission peak at 690 nm. Furthermore, solution‐processed exciplex and NIR devices also can maintain high efficiencies of 15.1% and 8.1%, respectively.

中文翻译：

使用新型供体-受体型供体的高效基于激基的绿色和近红外有机发光二极管

广泛研究的热激活延迟荧光（TADF）可以通过电子供体和电子受体之间的分子内和分子间电荷转移来实现，这分别对应于TADF材料和激基复合物。但是，基于激基复合物的高效有机发光二极管（OLED）的开发远远落后于基于高效TADF材料的有机发光二极管的开发。在这项工作中，设计并合成了一种新型的D‐A型电子供体TPAFPO。TPAFPO：PO‐T2T的ΔE _ST小79 meV的发射和明显的延迟发射，证明了TADF的特性。基于TPAFPO：PO-T2T的OLED的开启电压低至2.4 V，EQE值高至17.0％。此外，以TPAFPO：PO-T2T为主体的NIR OLED的启动电压为3.0 V，EQE高达9.2％，NIR发射峰在690 nm。此外，溶液处理的激基复合物和NIR器件也可以分别保持15.1％和8.1％的高效率。

更新日期：2020-12-01

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