Xiao, Yang and Lu, Xuehong and Zhang, Xinhai and He, Chaobin (2010) Synthesis and optical characteristics of organic light-emitting dot based on well-defined octa-functionalized silsesquioxane. Journal of Nanoparticle Research, 12 (8). pp. 2787-2798.
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This article reports the synthesis and characterization of a quantum-confined luminescent dot with size 2–3 nm using well-defined m-octa(bromophenyl) silsesquioxane (m-OBPS) as core. The highly regioselective bromination of octaphenylsilsesquioxane (OPS), which is an electron-deficient nanometer-sized molecule, has been synthesized using combined catalyst of iodine and zinc chloride at room temperature in dichloromethane solvent. Based on m-OBPS, a hybrid luminescent dot with well-defined structure was synthesized. UV absorption and PL spectra of this light-emitting dot remain same in dilute solution, condensed state, and solid solution. Furthermore, time-resolved PL study indicates that the exciton decay time of the light-emitting dot remains similar regardless in dilute solution, condensed state, or blended with other polymers, suggesting that the charge carriers are well confined within the individual light-emitting dot due to the unique star-like structure and shielding alkyl chain layer. The light-emitting nano-particles can be considered as isolated chromophores as both inter- and intra- molecular aggregation are prohibited.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||14 Jan 2011 07:32|
|Last Modified:||14 Jan 2011 07:32|
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