Amplified circularly polarized phosphorescence from co-assemblies of platinum(II) complexes
- 주제(기타) Chemistry, Multidisciplinary
- 설명문(일반) [Park, Gyurim; You, Youngmin] Ewha Womans Univ, Div Chem Engn & Mat Sci, Seoul 03760, South Korea; [Kim, Hyungchae; Park, Kyung Ryoul; Kim, Changsoon] Seoul Natl Univ, Interuniv Semicond Res Ctr, Grad Sch Convergence Sci & Technol, Seoul 08826, South Korea; [Yang, Hoichang] Inha Univ, Dept Chem Engn, Incheon 22212, South Korea; [Song, Inho; Oh, Joon Hak] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 08826, South Korea; [Song, Inho] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Pohang 37673, Gyeongbuk, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- OA유형 gold, Green Published
- 발행기관 ROYAL SOC CHEMISTRY
- 발행년도 2019
- URI http://www.dcollection.net/handler/ewha/000000160126
- 본문언어 영어
- Published As http://dx.doi.org/10.1039/c8sc04509g
- PubMed https://pubmed.ncbi.nlm.nih.gov/30809343
초록/요약
Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (g(abs), 0.020) and phosphorescence emission (g(lum), 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between glum and PLQY which has frequently been found for previous molecular emitters of circularly polarized luminescence. It is anticipated that our study will provide new insight into the future research for the exploitation of the full potential of CPP.
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