Highly efficient and stable solid-state luminescent nanohybrids: Precise architecture and enhancement mechanism
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an Yi Guang College of Chemistry and Chemical Engineering & Bioengineering, Donghua University, Shanghai 201620, China
Xin Yan Su and Hong Yao Xua) State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Material Science and Engineering, Donghua University, Shanghai 201620, China; and College of Materials Science and Engineering, Shanghai University, Shanghai 201800, People’s Republic of China
Xiang Yang Liu The Department of Physics, National University of Singapore, Singapore 1175542 (Received 13 November 2012; accepted 18 January 2013)
The organic light-emitting (OLE) materials have attracted great interest due to their potential applications in sensors, biodetectors and OLE devices. However, highly efficient emission from organic solids is still a great challenge because of the aggregation-caused quenching effect. In this article, a three-dimensional (3D) organic-inorganic hybrid nanoparticle, based on polyhedral oligomeric silsesquioxane (POSS), was precisely fabricated via click chemistry with high yield, and its structure was characterized by Fourier transform infrared spectroscopy, 1H, and 29Si nuclear magnetic resonance spectroscopies, and Matrix-Assisted Laser Desorption Ionization Timeof-Flight Mass Spectrometry, respectively. The resultant 3D organic-inorganic nanohybrid showed significantly enhanced emission in solid film (Ufilm 80%) with a slight red-shift as compared with its organic counterpart, (Ufilm 14%), which exhibits a large red-shift in solid film, due to the deaggregation effect of POSS. Simultaneously, the resultant nanohybrid also exhibited good film formability, excellent spectrum and thermal stability (.250 °C) due to the introduction of POSS.
I. INTRODUCTION
Organic light-emitting (OLE) materials have received considerable interest due to their promising application in biodetectors, sensors and organic light-emitting devices (OLEDs).1–3 However, the conjugated coplanar structures of OLE materials lead to aggregation-caused quenching (ACQ) effect in solid state due to strong intermolecular dipole-dipole and p-p stacking interaction, which severely limits their practical applications.4–7 Three-dimensional (3D) structural molecules with a large space free volume, such as hyperbranch and dendrimer, provide an important means to reduce and eliminate the aggregation due to steric hindrance effect.8–13 However, these resultant 3D materials often show low thermal properties. Simultaneously, the difficulty experienced during synthesis and purification also limits their practical applications. Fortunately, the discovery of click chemistry method and polyhedral oligomeric silsesquoixanes (POSS) with special 3D cage-like nanoscale structure provides an important a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2013.36 J. Mater. Res., Vol. 28, No. 8, Apr 28, 2013
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means to solve these problems. Click chemistry, especially 1,3-dipolar cycloaddition reaction between azide and a
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