Limits...
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.


SEM images. The filtered-up and filtered-down (a) pristine, (b) HT-110, (c) HT-150, and (d) HT-180 rubrene NPs. (e) Diameters of the filtered-up and filtered-down pristine and HT rubrene NPs as a function of hydrothermal temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211500&req=5

Figure 3: SEM images. The filtered-up and filtered-down (a) pristine, (b) HT-110, (c) HT-150, and (d) HT-180 rubrene NPs. (e) Diameters of the filtered-up and filtered-down pristine and HT rubrene NPs as a function of hydrothermal temperature.

Mentions: Figure 3a, b, c, d shows SEM images of the centrifugally filtered pristine and HT rubrene NPs. Filtered-up rubrene NPs have varying diameters depending on hydrothermal temperatures. The average diameters of the filtered-up and filtered-down pristine rubrene NPs were about 170 and 120 nm, respectively. Filtered-down rubrene NPs had homogeneous size distributions. Diameters of the filtered rubrene NPs after the hydrothermal treatment were precisely measured by DLS experiments, using a syringe filter with pore size of 1 μm for the elimination of dust, as shown in Figure 3e. Filtered-down rubrene NPs had average diameters of 120 nm (± 110 nm), which were almost independent of hydrothermal temperature. Mean diameters of filtered-up rubrene NPs slightly increased from approximately 350 nm to approximately 450 nm as hydrothermal temperatures increased from 110°C to 160°C, and those of the filtered-up HT-170 and HT-180 rubrene NPs rapidly increased to 740 and 890 nm, respectively. The rapid increase in mean diameters for the filtered-up HT rubrene NPs above 160°C might correlate with the decrease of the PL peak at 560 nm shown in Figure 2b.


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)

SEM images. The filtered-up and filtered-down (a) pristine, (b) HT-110, (c) HT-150, and (d) HT-180 rubrene NPs. (e) Diameters of the filtered-up and filtered-down pristine and HT rubrene NPs as a function of hydrothermal temperature.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: SEM images. The filtered-up and filtered-down (a) pristine, (b) HT-110, (c) HT-150, and (d) HT-180 rubrene NPs. (e) Diameters of the filtered-up and filtered-down pristine and HT rubrene NPs as a function of hydrothermal temperature.
Mentions: Figure 3a, b, c, d shows SEM images of the centrifugally filtered pristine and HT rubrene NPs. Filtered-up rubrene NPs have varying diameters depending on hydrothermal temperatures. The average diameters of the filtered-up and filtered-down pristine rubrene NPs were about 170 and 120 nm, respectively. Filtered-down rubrene NPs had homogeneous size distributions. Diameters of the filtered rubrene NPs after the hydrothermal treatment were precisely measured by DLS experiments, using a syringe filter with pore size of 1 μm for the elimination of dust, as shown in Figure 3e. Filtered-down rubrene NPs had average diameters of 120 nm (± 110 nm), which were almost independent of hydrothermal temperature. Mean diameters of filtered-up rubrene NPs slightly increased from approximately 350 nm to approximately 450 nm as hydrothermal temperatures increased from 110°C to 160°C, and those of the filtered-up HT-170 and HT-180 rubrene NPs rapidly increased to 740 and 890 nm, respectively. The rapid increase in mean diameters for the filtered-up HT rubrene NPs above 160°C might correlate with the decrease of the PL peak at 560 nm shown in Figure 2b.

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.