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- Title
High-performance near-infrared OLEDs maximized at 925 nm and 1022 nm through interfacial energy transfer.
- Authors
Hung, Chieh-Ming; Wang, Sheng-Fu; Chao, Wei-Chih; Li, Jian-Liang; Chen, Bo-Han; Lu, Chih-Hsuan; Tu, Kai-Yen; Yang, Shang-Da; Hung, Wen-Yi; Chi, Yun; Chou, Pi-Tai
- Abstract
Using a transfer printing technique, we imprint a layer of a designated near-infrared fluorescent dye BTP-eC9 onto a thin layer of Pt(II) complex, both of which are capable of self-assembly. Before integration, the Pt(II) complex layer gives intense deep-red phosphorescence maximized at ~740 nm, while the BTP-eC9 layer shows fluorescence at > 900 nm. Organic light emitting diodes fabricated under the imprinted bilayer architecture harvest most of Pt(II) complex phosphorescence, which undergoes triplet-to-singlet energy transfer to the BTP-eC9 dye, resulting in high-intensity hyperfluorescence at > 900 nm. As a result, devices achieve 925 nm emission with external quantum efficiencies of 2.24% (1.94 ± 0.18%) and maximum radiance of 39.97 W sr−1 m−2. Comprehensive morphology, spectroscopy and device analyses support the mechanism of interfacial energy transfer, which also is proved successful for BTPV-eC9 dye (1022 nm), making bright and far-reaching the prospective of hyperfluorescent OLEDs in the near-infrared region. The low photoluminescence quantum yield of near-infrared (NIR) emitters has limited their application in organic light-emitting diodes (OLEDs). Here, authors realize NIR OLEDs through interfacial energy transfer from platinum(II) complexes to a non-fullerene acceptor based on a sandwiched structure.
- Subjects
ENERGY transfer; ORGANIC light emitting diodes; DELAYED fluorescence; LIGHT emitting diodes; PHOSPHORESCENCE; TRANSFER printing; IMPRINTED polymers; QUANTUM efficiency; FLUORESCENT dyes
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49127-x