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Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process.

Kim MS, Cho EH, Park DH, Jung H, Bang J, Joo J - Nanoscale Res Lett (2011)

Bottom Line: The light-emitting color distribution of the NPs was confirmed using confocal laser spectrum microscope.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea. jjoo@korea.ac.kr.

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 μm, 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.

No MeSH data available.


(a) UV/vis absorption and (b) normalized PL spectra of the unfiltered pristine and HT NPs. Inset: Photographs of light emission for the pristine and HT rubrene NPs.
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Figure 2: (a) UV/vis absorption and (b) normalized PL spectra of the unfiltered pristine and HT NPs. Inset: Photographs of light emission for the pristine and HT rubrene NPs.

Mentions: Figure 2a, b shows UV/vis absorption and normalized PL spectra, repectively, of the unfiltered pristine and HT rubrene NPs. The UV/vis absorption peaks of pristine NPs were observed at the 438, 465, 496, and 531 nm, as shown in Figure 2a. In the case of the HT-150 and HT-155 NPs, the absorption peaks were observed at 435, 463, 500, and 547 nm, and new broad absorption band was appeared at approximately 399 nm (Figure 2a). The absorption peaks at 438 and 465 nm were slightly blue shifted to 435, 463 nm, respectively. The blue-shift of the absorption peaks and new absorption band at approximately 399 nm might be due to the H-aggregation [31], which will be discussed more detail in PL properties of the filtered rubrene NPs. For the HT-160 rubrene NPs, the UV/vis absorption characteristic peaks were disappeared.


Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process.

Kim MS, Cho EH, Park DH, Jung H, Bang J, Joo J - Nanoscale Res Lett (2011)

(a) UV/vis absorption and (b) normalized PL spectra of the unfiltered pristine and HT NPs. Inset: Photographs of light emission for the pristine and HT rubrene NPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211500&req=5

Figure 2: (a) UV/vis absorption and (b) normalized PL spectra of the unfiltered pristine and HT NPs. Inset: Photographs of light emission for the pristine and HT rubrene NPs.
Mentions: Figure 2a, b shows UV/vis absorption and normalized PL spectra, repectively, of the unfiltered pristine and HT rubrene NPs. The UV/vis absorption peaks of pristine NPs were observed at the 438, 465, 496, and 531 nm, as shown in Figure 2a. In the case of the HT-150 and HT-155 NPs, the absorption peaks were observed at 435, 463, 500, and 547 nm, and new broad absorption band was appeared at approximately 399 nm (Figure 2a). The absorption peaks at 438 and 465 nm were slightly blue shifted to 435, 463 nm, respectively. The blue-shift of the absorption peaks and new absorption band at approximately 399 nm might be due to the H-aggregation [31], which will be discussed more detail in PL properties of the filtered rubrene NPs. For the HT-160 rubrene NPs, the UV/vis absorption characteristic peaks were disappeared.

Bottom Line: The light-emitting color distribution of the NPs was confirmed using confocal laser spectrum microscope.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Physics, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea. jjoo@korea.ac.kr.

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 μm, 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.

No MeSH data available.