| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2014: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2013: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2012: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
In this work, we studied the optical properties of water-soluble luminescent cadmium chalcogenide clusters coated by hydrophilic poly(ethylene glycol) (PEG) units. Through the study on electronic absorption and photoluminescence spectra of a series of Cd10Se4(SR)10 clusters bearing directly-attached PEG units of various chain lengths, we showed that the surrounding PEG environments can electronically affect the properties of the inorganic core. Typically, the absorption bands exhibit a continuous blue shift as the increase of the PEG chain length. The chain length dependencies were also observed in the photoluminescence properties, particularly in the excitation spectra. We also studied the aggregation-induced emission enhancement of the clusters, and found that the direct-type PEG-modified clusters form aggregates upon treatment with lipophilic phenols through weak non-bonding interaction, showing notable emission enhancement in aqueous media.
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