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Báo cáo hóa học: " Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process | Kim et al. Nanoscale Research Letters 2011 6 405 http www.nanoscalereslett.eom content 6 1 405 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process Mi Suk Kim1 Eun Hei Cho1 Dong Hyuk Park1 2 Hyunjung Jung2 Joona Bang2 and Jinsoo Joo1 Abstract Light-emitting 5 6 11 12-tetraphenylnaphthacene rubrene nanoparticles NPs prepared by a reprecipitation method were treated hydrothermally. The diameters of hydrothermally treated rubrene NPs were changed from 100 nm to 2 pm depending on hydrothermal temperature. Photoluminescence PL characteristics of rubrene NPs varied with hydrothermal temperatures. Luminescence of pristine rubrene NPs was yellow-orange and it changed to blue as the hydrothermal temperature increased to 180 C. The light-emitting color distribution of the NPs was confirmed using confocal laser spectrum microscope. As the hydrothermal temperature increased from 110 C to 160 C the blue light emission at 464 to approximately 516 nm from filtered-down NPs was enhanced by H-type aggregation. Filtered-up rubrene NPs treated at 170 C and 180 C exhibited blue luminescence due to the decrease of intermolecular excimer densities with the rapid increase in size. Variations in PL of hydrothermally treated rubrene NPs resulted from different size distributions of the NPs. Introduction Optical properties of metal nanoparticles NPs can be controlled by their size and shape which have been studied with respect to the surface plasmon band of the metal nanostructures 1-4 . For advanced control of optical properties metal NPs can be oxidized incorporate dye or use polymers for the surface passivation 5-10 . In semiconducting silicon NPs photoluminescence PL characteristics depend on the thickness of the oxidation layer 11 . Organic fluorescence particles have been intensively studied for fundamental research and applications to optoelectronics 12-15 . In organic .