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Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking
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10.1063/1.4709757
/content/aip/journal/jap/111/9/10.1063/1.4709757
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4709757
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic representation of normal sysnchroscan mode, with corresponding streak image (c) of a CaGa2S4:Ce3+ sample. (b) Schematic representation of horizontal blanking with (d) the corresponding streak image of the same sample. The samples were excited with 250 nm laser pulses at 10 kHz.

Image of FIG. 2.
FIG. 2.

Emission spectra of undoped CaGa2S4 sample excited at 250 nm at different temperatures.

Image of FIG. 3.
FIG. 3.

Excitation spectrum (left blue curve) monitoring 550 nm of CaGa2S4: 1.5% Eu2+ at room temperature and emission spectra recorded 10 K (solid green curve) and room temperature (dashed green curve). The 10 K emission spectrum of undoped CaGa2S4 is shown for comparison (red curve). All emission spectra were recorded under 250 nm excitation.

Image of FIG. 4.
FIG. 4.

Streak image of 1.5 mol% Eu2+ doped CaGa2S4 at 10 ns time scale at room temperature (single sweep mode). Excitation was at 10 kHz with 250 nm laser pulses. The second order diffracted laser spot is visible at 500nm.

Image of FIG. 5.
FIG. 5.

Streak image of 1.5 mol. % Eu2+ doped CaGa2S4 at 2 ns time scale at room temperature (synchroscan mode, 48 ps IRF FWHM). Excitation was at 10 kHz with 250 nm laser pulses. The solid red curve in the right panel is a fit by the model presented in the analysis of the results section.

Image of FIG. 6.
FIG. 6.

Spectrally integrated time resolved measurement of 1 mol. % Eu2+ doped CaGa2S4, excited at 10 kHz with 250 nm pulses at room temperature.

Image of FIG. 7.
FIG. 7.

Spectrally integrated time resolved streak image data of CaGa2S4 doped with different Eu2+ concentrations excited with 250 nm fs pulses at room temperature. The drawn curves are fits by the model presented in the analysis of the results section.

Image of FIG. 8.
FIG. 8.

Spectrally integrated temperature dependent time resolved Eu2+ emission of 1.2 mol. % doped CaGa2S4 excited with 250 nm fs pulses. The drawn curves are fits by the model presented in the analysis of the results section.

Image of FIG. 9.
FIG. 9.

Fitted parameters f 1 and τc versus temperature (a) and Eu2+ doping concentration (b). The error bars represent the 95% confidence intervals for the least square estimated fitting parameters of the model (Eq. (3)). The dashed lines serve as a guide to the eye.

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/content/aip/journal/jap/111/9/10.1063/1.4709757
2012-05-04
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4709757
10.1063/1.4709757
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