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Electroluminescence from isolated quantum dots in multilayered light-emitting diodes
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View: Figures


Image of FIG. 1.
FIG. 1.

Absorption (dotted lines), photo- (dashed lines), and electroluminescence (solid lines) spectra for (A), (B), and (C) diameter QDs covered by of . Voltages and currents are (A) , ; (B) , ; and (C) , , respectively. Schematic of the structure of the multilayered QD LEDs is shown in the inset.

Image of FIG. 2.
FIG. 2.

Energy level diagram of the multilayered QD LEDs.

Image of FIG. 3.
FIG. 3.

Current-voltage curves of the QD LEDs with an average dot size of (solid line), (dashed line), and (dotted line). Triangles , circles , and solid squares represent the forward bias dependence of the electroluminescence intensity in the three samples. The electroluminescence spectra of the QD LEDs with a dot size of are shown as a function of the bias in the inset. The biases for the electroluminescence in the inset are 5.0 (dashed line) and (solid line).

Image of FIG. 4.
FIG. 4.

Current-voltage characteristics for several QD LEDs with the QDs and the TPD (dotted lines) and the devices of only the TPD without the QDs (solid line) or only the QDs without the TPD (dashed lines). Inset: Electroluminescence spectra of the QD LEDs with (solid line) and without the hole conductor TPD (dotted line) under forward voltages of 5.0 and .

Image of FIG. 5.
FIG. 5.

Electroluminescence spectra of the QD LEDs with different concentrations of the QDs. The resulting interface coverages for samples A–D were estimated to be 0.3, 0.2, 0.1, and of the QDs, respectively. No QDs were incorporated into the TPD in sample E. The spectra were taken under low voltage of about .

Image of FIG. 6.
FIG. 6.

Absorption (dotted lines) and electroluminescence (dashed-dotted lines) spectra of the QDs with the TOPO (A), dodecylamine (B), and polymer (C) ligands at forward biases of 5.0, 5.5, and , respectively. The solid and dashed lines represent the photoluminescence spectra from the QDs in the LEDs and from a thin film of the same QDs on a thin glass substrate, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electroluminescence from isolated CdSe∕ZnS quantum dots in multilayered light-emitting diodes