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Title: | C₁-Symmetric [Ir(C^N¹)(C^N²)(O^O)]-Tris-Heteroleptic Iridium(III)-Complexes with the preferentially horizontal orientation for high-performance near-infrared organic light-emitting diodes | Authors: | Li, W Wang, B Miao, T Liu, J Xingqiang, L Fu, G Shi, L Chen, Z Qian, P Wong, WY |
Issue Date: | 4-Aug-2021 | Source: | Advanced optical materials, 4 Aug. 2021, v. 9, no. 15, 2100117 | Abstract: | The development of high-efficiency near-infrared (NIR)-emitting Ir(III)-complex-based phosphors for reliable NIR-OLEDs (near-infrared organic light-emitting diodes) is still a formidable challenge. Herein, a molecule-engineered approach is developed to afford three C₁-Symmetric [Ir(C^N¹)(C^N²)(O^O)]-tris-heteroleptic Ir(III)-complexes ([Ir(iqbt)(dFppy)(acac)] (1), [Ir(iqbt)(ppy)(acac)] (2), and [Ir(iqbt)(dpqx)(acac)] (3)), whose good NIR-luminescent efficiency (ΦPL = 0.18 for 1 (λem = 703 nm), 0.26 for 2 (λem = 715 nm) or 0.28 for 3 (λem = 707 nm)) originates from the strengthened 3MLCT contribution (MLCT = metal-to-ligand charge transfer). Moreover, the quantitative molecular orientation determination of their doped emitting layers (EMLs) reveals that the preferentially horizontal orientation of the emitting dipoles is beneficial to their highly efficient NIR-OLEDs with light out-coupling. Especially for the NIR-OLED -2 with λem = 715 nm, a high performance (ηEQEᴹᵃˣ = 5.30% and negligible (<2%) efficiency-roll-off) is realized among the reported solution-processed NIR-OLEDs based on Ir(III)-complexes at similar color gamut. This result shows that C1-symmetric C₁-Symmetric [Ir(C^N¹)(C^N²)(O^O)]-tris-heteroleptic Ir(III)-complexes can provide a new platform to low-cost and large-area scalable NIR-OLEDs. | Keywords: | Cyclometalated Ir(III)-complex Near-infrared phosphorescence Organic light-emitting diodes Solution-processed devices Transition dipole moment Tris-heteroleptic configuration |
Publisher: | Wiley-VCH | Journal: | Advanced optical materials | EISSN: | 2195-1071 | DOI: | 10.1002/adom.202100117 | Rights: | © 2021 Wiley-VCH GmbH This is the peer reviewed version of the following article: Li, W., Wang, B., Miao, T., Liu, J., Lü, X., Fu, G., ... & Wong, W. Y. (2021). C1‐Symmetric [Ir (C^ N1)(C^ N2)(O^ O)]‐Tris‐Heteroleptic Iridium (III)‐Complexes with the Preferentially Horizontal Orientation for High‐Performance Near‐Infrared Organic Light‐Emitting Diodes. Advanced Optical Materials, 9(15), 2100117, which has been published in final form at https://doi.org/10.1002/adom.202100117. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
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Fu_C1-Symmetric_Preferentially_Horizontal.pdf | Pre-Published version | 1.59 MB | Adobe PDF | View/Open |
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