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Efficient upconversion fluorescence in a blue-emitting spirobifluorene-anthracene copolymer doped with low concentrations of Pt(II)octaethylporphyrin
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10.1063/1.1992477
/content/aip/journal/jcp/123/7/10.1063/1.1992477
http://aip.metastore.ingenta.com/content/aip/journal/jcp/123/7/10.1063/1.1992477
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structure and composition of the investigated spirobifluorene copolymers. The contents of each unit are as follows: spirocopolymer 1 (, , and ) and spirocopolymer 2 (, , and ).

Image of FIG. 2.
FIG. 2.

Normalized room temperature prompt fluorescence spectrum of a thin film of spirocopolymer 1 excited at 3.49 eV (355 nm) with an intensity of and normalized absorption of a thin film.

Image of FIG. 3.
FIG. 3.

Prompt room-temperature PL emission spectra of thin polymer films of spirocopolymer 1 (solid line), spirocopolymer 2 (dotted line), and polyfluorene (PF) (dashed line) doped with 2-wt % PtOEP upon excitation into the PtOEP singlet at 537 nm (2.31 eV) with an excitation intensity of . The spectra were measured with a gate window of 10 ms. Since film thickness and doping level of all samples were identical, the detector counts can be used as a measure to compare the upconversion intensity. An interference filter was used to suppress the green laser light and a short-pass filter to cut the intense PtOEP phosphorescence.

Image of FIG. 4.
FIG. 4.

Intensity dependence of PtOEP phosphorescence and upconverted blue delayed fluorescence (DF) from the matrix polymer of a thin film of spirocopolymer 1 doped with 0.5-wt % PtOEP. Excitation was performed at 537 nm (2.31 eV) at room temperature. ( denotes the slopes of each line which is a guide to the eye.)

Image of FIG. 5.
FIG. 5.

PL emission spectra of thin films of spirocopolymer 1 doped with 0.5-wt % PtOEP (solid line) and 1.0-wt % PtOEP (dashed line). Excitation was performed at 537 nm with at room temperature. An interference filter was used to suppress the intense green laser peak.

Image of FIG. 6.
FIG. 6.

Schematic representation of the energy levels and transfer mechanism in the PtOEP-doped spirocopolymer 1 (see Sec. III for further explanation).

Image of FIG. 7.
FIG. 7.

Integral decay kinetics of phosphorescence from PtOEP and upconverted delayed fluorescence (DF) from spirocopolymer 1 at zero electric field (open characters) and at an electric field of (solid characters) at room temperature. The concentration of PtOEP was 1 wt % and excitation was performed at 537 nm (2.31 eV). A gate window of 10 ms was chosen for the detection.

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/content/aip/journal/jcp/123/7/10.1063/1.1992477
2005-08-19
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficient upconversion fluorescence in a blue-emitting spirobifluorene-anthracene copolymer doped with low concentrations of Pt(II)octaethylporphyrin
http://aip.metastore.ingenta.com/content/aip/journal/jcp/123/7/10.1063/1.1992477
10.1063/1.1992477
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