Department of Chemistry, Shiv Nadar University, NH-91, Tehsil Dadri, District Gautam Buddha Nagar, Uttar Pradesh, 201314, India.
Chem Commun (Camb). 2019 Feb 7;55(13):1899-1902. doi: 10.1039/c8cc09220f.
The influences of naphthyl and/or phenyl rings at the 2,4-positions of the quinolinyl fragments in carbazole-quinoline conjugates are studied. The centric phase of one of the conjugates (β-CQNN) revealed both thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP), while prompt fluorescence and RTP were observed in the non-centric phase (α-CQNN) that can regenerate the emission features of β-CQNNvia mechanical grinding. This unique observation is explained by the modulation of the higher-lying triplet (T2) energy level caused by conformational change.
研究了咔唑-喹啉共轭物中喹啉片段的 2,4-位萘基和/或苯基环的影响。其中一个共轭物（β-CQNN）的中心相表现出热激活延迟荧光（TADF）和室温磷光（RTP），而在非中心相（α-CQNN）中则观察到了瞬间荧光和 RTP，通过机械研磨可以使非中心相恢复到β-CQNN 的发射特性。这种独特的观察结果可以通过构象变化引起的较高三重态（T2）能级的调制来解释。
