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Role of synthesis for oxygen defect incorporation in crystalline rubrene
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) -polarized spectra of a rubrene crystal measured at an angle from the axis. The spectrum is measured on the surface with the incident laser polarization and the polarization analyzer oriented parallel to the axis. Spectra are offset vertically for clarity. The crystallographic axes in the setting are shown in the inset. The diagrams show the molecular packing on the and surfaces of the rubrene crystal.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Spectra of rubrene crystals grown in pure argon gas (1), unintentionally contaminated argon gas (2,3), and an argon/oxygen mixture (4). (b) Spectra of crystals sampled from a long crystal growth zone. Samples 1–4 were grown at , 20, 30, and , respectively, where is the position along the direction of the gas flow. The growth temperature is different for each sample: . (c) Normalized spectra of a rubrene crystal with the -band measured using different excitation power: 0.5, 5, and .

Image of FIG. 3.
FIG. 3.

(Color online) Effects of photo-oxidation on the PL spectrum for a commercially synthesized rubrene crystal with crystallographic defects (a) and for a high-quality vapor transport grown crystal (b). A small area (diameter of ) in each sample is exposed to the laser beam ( , , -polarized) for in air. The PL spectra are measured in the beginning and at the end of the exposure. The polarization analyzer is along the -axis. The PL spectrum of the exposed crystal in panel (a) is multiplied by a factor of 2 for clarity. A thin black line in panel (a) shows a scaled spectrum of the exposed high-quality crystal from panel (b) for comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of synthesis for oxygen defect incorporation in crystalline rubrene