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- Title
Highly Efficient Near-Infrared Delayed Fluorescence Organic Light Emitting Diodes Using a Phenanthrene-Based Charge-Transfer Compound.
- Authors
Wang, Shipan; Yan, Xianju; Cheng, Zong; Zhang, Hongyu; Liu, Yu; Wang, Yue
- Abstract
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 (Δ EST) 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.
- Subjects
NEAR infrared radiation; ORGANIC light emitting diodes; PHENANTHRENE; DELAYED fluorescence; OPTICAL materials
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 44, p13260
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201506687