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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/126612
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| 題名: | Cyano-substituted bis((benzothiophen-2-yl)pyridine)(acetylacetonate) iridium complexes for efficient and stable deep red organic light-emitting diodes emitting at 673 nm |
| 作者: | Zhang, Wen-Hao;Luo, Dian;Shih, Jin-San;Huang, Lin-Ming;Peng, Shu-Wan;Lee, Chih-Chien;Liu, Shun-Wei;Chen, Chih-Hsin |
| 日期: | 2024-11-04 |
| 上傳時間: | 2024-12-24 12:05:28 (UTC+8) |
| 出版者: | Elsevier |
| 摘要: | This study explores the development of cyano-substituted bis((benzothiophen-2-yl)pyridine) (acetylacetonate) iridium complexes, specifically Ir(btpCN)2(acac), for use in efficient and stable deep red organic light-emitting diodes (OLEDs) emitting at 673 nm. The new emitter, Ir(btpCN)2(acac), was designed to achieve red-shifted emission through strategic cyano substitution at the meta-position of pyridine moiety of btp ligand, leveraging the favorable overlap between its emission spectrum and the absorption spectrum of the exciplex host composed of BCzPh and CN-T2T. The OLED devices employing Ir(btpCN)2(acac) as the emitter exhibited a peak external quantum efficiency (EQE) of 10.2 % and an emission wavelength of 673 nm. Significantly, these devices demonstrated superior operational stability, with a lifetime (LT50) of 190.8 h at an initial luminance of 200 cd m−2, which is among the highest reported for deep-red OLEDs in the literature. This remarkable stability is achieved without compromising the device performance, making Ir(btpCN)2(acac) a highly promising candidate for commercial applications. In addition, the straightforward synthesis process of Ir(btpCN)2(acac) further enhances its potential for widespread use. Overall, our findings highlight the potential of cyano-substituted Ir complexes for creating efficient, stable, and commercially viable deep-red OLEDs. The balanced performance of Ir(btpCN)2(acac) in terms of efficiency, stability, and ease of synthesis marks a significant advancement in the development of OLED technology suitable for phototherapy and other applications requiring reliable deep-red light sources. |
| 關聯: | Dyes and Pigments 233 (2025) 112532 |
| DOI: | 10.1016/j.dyepig.2024.112532 |
| 顯示於類別: | [化學學系暨研究所] 期刊論文
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