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Improved luminescence from CdSe quantum dots with a strain-compensated shell
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10.1063/1.4775678
/content/aip/journal/apl/102/2/10.1063/1.4775678
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4775678
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Powder XRD of CdSe/ZnS (2 MLs)/ZnCdS (2 MLs) QDs.

Image of FIG. 2.
FIG. 2.

Evolution of the PL peak red shift of CdSe CS and CSS QDs during the shell growth. Solid squares: CdSe/ZnCdS CS QDs; open squares: CdSe/ZnCdS/ZnS CSS I QDs; solid circles: CdSe/ZnS CS QDs; and open circles: CdSe/ZnS/ZnCdS CSS II QDs. The inset shows the schematic energy level alignments in CSS I and CSS II QDs.

Image of FIG. 3.
FIG. 3.

Evolution of the PL QY of CdSe CS and CSS QDs during the shell growth. Solid squares: CdSe/ZnCdS CS QDs; open squares: CdSe/ZnCdS/ZnS CSS I QDs; solid circles: CdSe/ZnS CS QDs; and open circles: CdSe/ZnS/ZnCdS CSS II QDs.

Image of FIG. 4.
FIG. 4.

EL spectra of CSS I and CSS II QD-LEDs at 20 mA/cm2, along with the PL spectra of the QDs measured in hexane solutions. The EL and PL peak intensities are normalized. The inset shows a schematic of the LED structure.

Image of FIG. 5.
FIG. 5.

Forward I–V characteristics of CSS I and CSS II QD-LEDs with the QD EML prepared from 2 mg/ml and 4 mg/ml QD solutions.

Image of FIG. 6.
FIG. 6.

L–I characteristics of CSS I and CSS II QD-LEDs with the QD EML prepared from 2 mg/ml and 4 mg/ml QD solutions.

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/content/aip/journal/apl/102/2/10.1063/1.4775678
2013-01-16
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Improved luminescence from CdSe quantum dots with a strain-compensated shell
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4775678
10.1063/1.4775678
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