5 December 2006 Aggregation-induced emission
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New chromophoric molecules of 1,1-di(thiophen-2-yl)-2,3,4,5-tetraphenyl-silole (T2TPS), 9-(diphenylmethylene)-9H-fluorene (DPMF), and tetraphenyletheneare (TPE) are designed and synthesized. When molecularly dissolved in common organic solvents, the molecules are practically nonemissive. Addition of poor solvents induces the molecules to aggregate, which turns the emission "on" and boosts their luminescence efficiencies dramatically ("aggregation-induced emission" or AIE). The photoluminescence (PL) of T2TPS and TPE layers adsorbed on the TLC plates can be turned "off" and "on" continuously and reversibly by solvent exposure and evaporation. Transformation from amorphous phase to crystalline structure blue-shifts the PL spectrum of T2TPS and enhances its intensity. A light-emitting devices (LEDs) device based on TPE is fabricated, which emits a blue light of 447 nm with a low turn-on voltage of 2.9 V.
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Yongqiang Dong, Yongqiang Dong, Jacky Wing Yip Lam, Jacky Wing Yip Lam, Anjun Qin, Anjun Qin, Zhen Li, Zhen Li, Jiaxin Sun, Jiaxin Sun, Hoi Sing Kwok, Hoi Sing Kwok, Ben Zhong Tang, Ben Zhong Tang, } "Aggregation-induced emission", Proc. SPIE 6333, Organic Light Emitting Materials and Devices X, 63331D (5 December 2006); doi: 10.1117/12.679373; https://doi.org/10.1117/12.679373

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