基于菲的电荷转移化合物的高效近红外延迟荧光有机发光二极管。
Highly Efficient Near-Infrared Delayed Fluorescence Organic Light Emitting Diodes Using a Phenanthrene-Based Charge-Transfer Compound.
机构信息
State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China).
出版信息
Angew Chem Int Ed Engl. 2015 Oct 26;54(44):13068-72. doi: 10.1002/anie.201506687. Epub 2015 Sep 7.
Significant efforts have been made to develop high-efficiency organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) emitters with blue, green, yellow, and orange-red colors. However, efficient TADF materials with colors ranging from red, to deep-red, to near-infrared (NIR) have been rarely reported owing to the difficulty in molecular design. Herein, we report the first NIR TADF molecule TPA-DCPP (TPA=triphenylamine; DCPP=2,3-dicyanopyrazino phenanthrene) which has a small singlet-triplet splitting (ΔEST ) of 0.13 eV. Its nondoped OLED device exhibits a maximum external quantum efficiency (EQE) of 2.1 % with a Commission International de L'Éclairage (CIE) coordinate of (0.70, 0.29). Moreover, an extremely high EQE of nearly 10 % with an emission band at λ=668 nm has been achieved in the doped device, which is comparable to the most-efficient deep-red/NIR phosphorescent OLEDs with similar electroluminescent spectra.
人们已经做出了巨大的努力来开发高效率的有机发光二极管（OLED），采用热激活延迟荧光（TADF）发射体，具有蓝色、绿色、黄色和橙红色。然而，由于分子设计的困难，很少有报道具有从红色到深红色到近红外（NIR）颜色的高效 TADF 材料。在此，我们报告了第一个 NIR TADF 分子 TPA-DCPP（TPA=三苯胺；DCPP=2,3-二氰基吡嗪并菲），其单重态-三重态分裂（ΔEST）很小，为 0.13 eV。其非掺杂 OLED 器件的最大外量子效率（EQE）为 2.1%，色坐标为（0.70,0.29）。此外，掺杂器件中实现了极高达近 10%的 EQE 和 λ=668nm 的发射带，与具有相似电致发光光谱的最有效的深红色/NIR 磷光 OLED 相当。
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