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Twist to Boost: Circumventing Quantum Yield and Dissymmetry Factor Trade-Off in Circularly Polarized Luminescence

Title
Twist to Boost: Circumventing Quantum Yield and Dissymmetry Factor Trade-Off in Circularly Polarized Luminescence
Authors
Lee, SuminLee, YoungmoonKim, KyungminHeo, SeungaJeong, Dong YeunKim, SangsubCho, JaeheungKim, ChangsoonYou, Youngmin
DGIST Authors
Lee, Sumin; Lee, Youngmoon; Kim, Kyungmin; Heo, Seunga; Jeong, Dong Yeun; Kim, Sangsub; Cho, Jaeheung; Kim, Changsoon; You, Youngmin
Issue Date
2021-03
Citation
Inorganic Chemistry, 60(11), 7738-7752
Type
Article
Keywords
CYCLOMETALATED PLATINUM(II) COMPLEXESACTIVATED DELAYED FLUORESCENCELIQUID-CRYSTAL MATERIALSMETAL-METAL INTERACTIONSPHOTOPHYSICAL PROPERTIESCHIROPTICAL PROPERTIESPT(II) COMPLEXES2-STEP SYNTHESISFULL-COLORLIGHT
ISSN
0020-1669
Abstract
Circularly polarized luminescence (CPL) enables promising applications in asymmetric photonics. However, the performances of CPL molecules do not yet meet the requirements of these applications. The shortcoming originates from the trade-off in CPL between the photoluminescence quantum yield (PLQY) and the photoluminescence dissymmetry factor (gPL). In this study, we developed a molecular strategy to circumvent this trade-off. Our approach takes advantage of the strong propensity of [Pt(N^C^N)Cl], where the N^C^N ligand is 1-(2-oxazoline)-3-(2-pyridyl)phenylate, to form face-to-face stacks. We introduced chiral substituents, including (S)-methyl, (R)- and (S)-isopropyl, and (S)-indanyl groups, into the ligand framework. This asymmetric control induces torsional displacements that give homohelical stacks of the Pt(II) complexes. X-ray single-crystal structure analyses for the (S)-isopropyl Pt(II) complex reveal the formation of a homohelical dimer with a Pt···Pt distance of 3.48 Å, which is less than the sum of the van der Waals radii of Pt. This helical stack elicits the metal-metal-to-ligand charge-transfer (MMLCT) transition that exhibits strong chiroptical activity due to the electric transition moment making an acute angle to the magnetic transition moment. The PLQY and gPL values of the MMLCT phosphorescence emission of the (S)-isopropyl Pt(II) complex are 0.49 and 8.4 × 10-4, which are improved by factors of ca. 6 and 4, respectively, relative to the values of the unimolecular emission (PLQY, 0.078; gPL, 2.4 × 10-4). Our photophysical measurements for the systematically controlled Pt(II) complexes reveal that the CPL amplifications depend on the chiral substituent. Our investigations also indicate that excimers are not responsible for the enhanced chiroptical activity. To demonstrate the effectiveness of our approach, organic electroluminescence devices were fabricated. The MMLCT emission devices were found to exhibit simultaneous enhancements in the external quantum efficiency (EQE, 9.7%) and the electroluminescence dissymmetry factor (gEL, 1.2 × 10-4) over the unimolecular emission devices (EQE, 5.8%; gEL, 0.3 × 10-4). These results demonstrate the usefulness of using the chiroptically active MMLCT emission for achieving an amplified CPL. © 2021 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/15484
DOI
10.1021/acs.inorgchem.1c00070
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Department of Physics and ChemistryBiomimetic Materials Laboratory1. Journal Articles


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