Chemistry - An Asian Journal
10.1002/asia.201801666
FULL PAPER
D
2
O as the internal standard. The elemental analysis was carried out by
Hammer, J. Köhler, H. W. Schmidt and R. Hildner, Nature 2015, 523,
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using Yanaco CHN Corder MT-5 at the Elemental Analysis Center, Kyushu
University. Dynamic light scattering measurements were carried out by
using Malvern Nano-ZS ZEN3600. Absorption spectra were recorded on a
JASCO V-770 spectrophotometer. Fluorescence spectra were measured
by using a PerkinElmer LS 55 fluorescence spectrometer. The absolute
fluorescence quantum yield was measured in an integrating sphere using
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HAMAMATSU multichannel analyzer C10027-01. Time-resolved
photoluminescence lifetime measurements were carried out by using a
time-correlated single photon counting lifetime spectroscopy system,
HAMAMATSU Quantaurus-Tau C11367-02 (for fluorescence lifetime) and
C11567-01 (for delayed luminescence lifetime).
For TTA-UC emission spectra, a diode laser (532 nm, 200 mW, RGB
Photonics) was used as an excitation source. The laser power was
controlled by combining a software (Ltune) and a variable neutral density
filter and measured using a PD300-UV photodiode sensor (OPHIR
Photonics). The laser beam was focused on a sample using a lens. The
diameter of the laser beam (1/e ) was measured at the sample position
using a CCD beam profiler SP620 (OPHIR Photonics). A typical area of
laser irradiation spot estimated from the diameter was 2.6×10-4 cm2. The
2
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emitted light was collimated by an achromatic lens, the excitation light was
removed using a notch filter (532 nm), and the emitted light was again
focused by an achromatic lens to an optical fiber connected to a
multichannel detector MCPD-9800 which was supplied and calibrated by
Otsuka Electronics and equipped with a CCD sensor for the detection of
whole visible range with high sensitivity.
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estimated as 10% of the absorbance of the higher concentration A1-
PtOEP dispersion ([A1] = 400 µM, [PtOEP] = 1 µM). Note that the
theoretical maximum of TTA-UC efficiency is standardized to be 1 (100%).
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Acknowledgments
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This work was partly supported by JSPS KAKENHI Grant
Numbers
JP25220805,
JP17H04799,
JP16H06513,
JP16H00844, PRESTO program on “Molecular Technology and
Creation of New Functions” from JST (JPMJPR14KE), and The
Murata Science Foundation. We are grateful to Prof. D. Kohda,
Prof. K. Mayanagi, and Dr. R. Ugawa at Medical Institute of
Bioregulation, Kyushu University for the TEM observation and
helpful discussions about the assembly structure.
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