Brightening deep-blue perovskite light-emitting diodes: a path to Rec. 2020

Jung-Yong Lee

doi:10.1117/12.3034310

30 September 2024 Brightening deep-blue perovskite light-emitting diodes: a path to Rec. 2020

Jung-Yong Lee

Author Affiliations +

Proceedings Volume 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII; 1312217 (2024) https://doi.org/10.1117/12.3034310
Event: Organic Photonics + Electronics, 2024, San Diego, California, United States

Abstract

High-purity deep-blue perovskite light-emitting diodes (PeLEDs) are essential for next-generation displays that meet the Rec. 2020 standard. However, halide vacancies, particularly chloride, cause bandgap instability and reduced LED performance in mixed-halide perovskites. We present a chloride vacancy passivation (CVTP) strategy using sulfonate group ligands with varying chain lengths, which strongly bind to Pb(II) ions and fill the vacancies. This approach prevents phase segregation, producing color-stable deep-blue PeLEDs with a 461 nm emission peak and 2,707 cd/m2 luminance, among the highest for Rec. 2020 compliant PeLEDs. Additionally, external quantum efficiency improved to 5.68%, influenced by ligand chain length.

Conference Presentation

Citation Download Citation

Jung-Yong Lee "Brightening deep-blue perovskite light-emitting diodes: a path to Rec. 2020", Proc. SPIE 13122, Organic and Hybrid Light Emitting Materials and Devices XXVIII, 1312217 (30 September 2024); https://doi.org/10.1117/12.3034310

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