https://scholars.lib.ntu.edu.tw/handle/123456789/580758
標題: | High-Efficiency Red Electroluminescence Based on a Carbene-Cu(I)-Acridine Complex | 作者: | CHUNG-CHIH WU | 關鍵字: | Amides; Coinage; Efficiency; Excited states; Ligands; Metal complexes; Mints; Orbits; Organic light emitting diodes (OLED); Organometallics; Quantum efficiency; Spin orbit coupling; External quantum efficiency; Horizontal dipoles; Linear geometry; Organic light emitting diodes(OLEDs); Photoluminescence quantum yields; Red electroluminescence; State-of-the-art performance; Sub-microsecond; Copper compounds | 公開日期: | 2021 | 卷: | 13 | 期: | 11 | 起(迄)頁: | 13478-13486 | 來源出版物: | ACS Applied Materials and Interfaces | 摘要: | How to develop efficient red-emitting organometallics of earth-abundant copper(I) is a formidable challenge in the field of organic light-emitting diodes (OLEDs) because Cu(I) complexes have weak spin-orbit coupling and a serious excited-state reorganization effect. Here, a red Cu(I) complex, MAC*-Cu-DPAC, was developed using a rigid 9,9-diphenyl-9,10-dihydroacridine donor ligand in a carbene-metal-amide motif. The Cu(I) complex achieved satisfactory red emission, a high photoluminescence quantum yield of up to 70%, and a sub-microsecond lifetime. Thanks to a linear geometry and the acceptor and donor ligands in a coplanar conformation, the complex exhibited a high horizontal dipole ratio of 77% in the host matrix, first demonstrated for coinage metal(I) complexes. The resulting OLEDs delivered high external quantum efficiencies of 21.1% at a maximum and 20.1% at 1000 nits, together with a red emission peak at ?630 nm. These values represent the state-of-the-art performance for red-emitting OLEDs based on coinage metal complexes. ? 2021 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103476691&doi=10.1021%2facsami.0c22109&partnerID=40&md5=5123891f611aa155448e7f4d5eb2f03d https://scholars.lib.ntu.edu.tw/handle/123456789/580758 |
ISSN: | 19448244 | DOI: | 10.1021/acsami.0c22109 |
顯示於: | 電機工程學系 |
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