Optimizing Charge Transfer and Out‐Coupling of A Quasi‐Planar Deep‐Red TADF Emitter: towards Rec.2020 Gamut and External Quantum Efficiency beyond 30 %
Optimizing Charge Transfer and Out‐Coupling of A Quasi‐Planar Deep‐Red TADF Emitter: towards Rec.2020 Gamut and External Quantum Efficiency beyond 30 %
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优化%20Charge%20Transfer%20and%20Out —Coupling%20of%20A%20Quasi —Planar%20Deep —Red%20TADF%20Emitter:%20towards%20Rec.2020%20Gamut%20and%20External%20Quantum%20Efficiency%20beyond%
DOI：
10.1002/ange.202103070
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Hui Xu
中科院分区：
文献类型：
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作者：
Zhe Li;Dezhi Yang;Chunmiao Han;Bingjie Zhao;Huiqin Wang;Yi Man;Peng Ma;Peng Chang;Dongge Ma;Hui Xu
在此，我们报道了一种深红色TADF发射器pCNQ-TPA，由喹喔啉-5,8-二甲腈（pCNQ）受体和三苯胺（TPA）供体组成。pCNQ-TPA支持其OLED，具有所需的CIE坐标（0.69，0.31）和创纪录的最大外部量子效率30.3％，这是Rec.2020中最好的红色TADF二极管超高清电视的色域。结果表明，通过调节pCNQ-TPA掺杂浓度，平衡分子内和分子间电荷转移，同步提高发射颜色饱和度和TADF辐射，并纠正聚集诱导的猝灭，使光致发光量子产率（PLQY）达到90 %，深红色发射峰值在≈690 nm。准平面结构进一步赋予spCNQ-TPA更高的发射偶极子取向水平比，从而将光输出耦合比提高到0.34，从而实现最先进的器件效率。
Herein, we report a deep‐red TADF emitterpCNQ–TPA, composed of quinoxaline‐5,8‐dicarbonitrile (pCNQ) acceptor and triphenylamine (TPA) donor.pCNQ–TPAsupported its OLED with desired CIE coordinates of (0.69, 0.31) and the record maximum external quantum efficiency of 30.3 %, which is the best red TADF diode with Rec.2020 gamut for UHDTV. It is showed that through tuningpCNQ–TPAdoping concentration, intra‐ and inter‐molecular charge transfer are balanced to synchronously improve emission color saturation and TADF radiation, and remedy aggregation‐induced quenching, rendering photoluminescence quantum yield (PLQY) reaching 90 % for deep‐red emission peaked at ≈690 nm. Quasi‐planar structure further endowspCNQ–TPAwith an improved horizontal ratio of emitting dipole orientation, which increases light out‐coupling ratio to 0.34 for achieving the state‐of‐the‐art device efficiencies.