Hamamatsu News 2-2016 - page 32

SYSTEMS PRODUCTS
News 2016 Vol. 2
32
Singlet oxygen luminescence quantum yield
Quantaurus-QY Plus UV-NIR Absolute
PL Quantum Yield Spectrometer
New
Easily extend functions with newly designed options
Quantaurus-QY Plus easily measures absolute PL quantum yield, which is
difficult to measure using conventional technology.
New features
„
„
For near-infrared up to 1,650 nm (C13534-31, -32)
„
„
For low quantum yield of 1 % or lower (C13534-33, -34)
„
„
For upconversion emission material (C13534-35, -36)
Features
„
„
Measures absolute photoluminescence quantum yield
of light-emitting materials (PL measurement)
„
„
Utilizes an integrating sphere to measure all luminous flux
„
„
Cooled, back-thinned CCD sensor allows measurements
with ultra-high sensitivity and high S/N ratio
„
„
Automatically controls the excitation wavelengths
„
„
Wide selection of analysis functions
Photoluminescence quantum yield
Excitation wavelength dependence
Photoluminescence spectrum
„
„
PL excitation spectrum
This is an example of the luminescence quantum yield measurement of
singlet oxygen using platinum (II) mesotetra (pentafluorophenyl) porphine
(PtTFPP) solution as a radiosensitizing agent. We successfully expanded
the wavelength region for the measurements to a wide 400 nm to 1,650 nm
range using a combination of BT-CCD and InGaAs line sensors.
As a result, we were able to simultaneously measure both the excitation
light profile (center wavelength: 525 nm) and the singlet oxygen emission
spectrum (peak wavelength: 1,270 nm), and obtained 0.022 as the absolute
luminescence quantum yield for singlet oxygen.
Fig.1 Excitation light profile and emission spectrum in the
presence/absence of a chloroform solution of PtTFPP
ND Inspection
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6
4
2
0
500
1000
Photon number / x 10
8
a.u.
)
Wavelength (nm)
Sample
Reference
Photon number / x 10
7
(a.u.)
4
2
0
1100
1200
1300
1400
Wavelength (nm)
Φ
PL
= 0.022
λ
ex
= 525 nm
λ
em
= 1,270 nm
F
F
F
F
F
F
F
F F
F
F
F
F
F
F
F
F
F
F
F
N N
N N
Pt
Courtesy of Tobita lab, Graduate School of Science and Technology, Gunma University
N. Hasebe, K. Suzuki, H. Horiuchi, H. Suzuki, T. Yoshihara, T. Okutsu, and S. Tobita,
Anal. Chem.
, 87, 2360 (2015)
platinum (II) mesotetra (pentafluorophenyl)
porphine (PtTFPP)
1...,22,23,24,25,26,27,28,29,30,31 33,34,35,36,37,38,39,40,41,42,...44
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