Green emission from InP-GaP quantum-dot light-emitting diodes

Author

Hatami, F. ; Masselink, W.T. ; Lordi, V. ; Harris, J.S., Jr.

Author_Institution

Dept. of Phys., Humboldt-Univ., Berlin, Germany

Volume

18

Issue

7

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

895

Lastpage

897

Abstract

The green electroluminescent emission from light-emitting diodes (LEDs) based on the InP-GaP quantum-dot (QD) system is investigated and discussed. The active region of the diode consists of stacked self-assembled Stranski-Krastanow indium phosphide QDs accompanied by thin quantum-well wetting layers (WLs) and embedded in a gallium phosphide matrix. LEDs based on this QD system exhibit both red and green emission. The red electroluminescence at about 720 nm originates from direct-band-gap recombination within the QDs themselves and dominates for low current. The green emission at about 550 nm appears to originate from the WL and dominates for higher current density. The marked difference in current-dependence of the green (WL) and red (QD) emission peaks enables the control of the color of the emitted light through the drive current and, thus, allows a realization of color-tunable LEDs.

Keywords

III-V semiconductors; current density; electroluminescence; electroluminescent devices; gallium compounds; indium compounds; light emitting diodes; self-assembly; semiconductor quantum dots; InP-GaP; InP-GaP quantum-dot light-emitting diodes; LED; current density; direct-band-gap recombination; electroluminescence; quantum-well wetting layers; self-assembled Stranski-Krastanow indium phosphide QD; Electroluminescence; Gallium compounds; Gold; Indium phosphide; Light emitting diodes; Molecular beam epitaxial growth; P-i-n diodes; Quantum dots; Quantum wells; Radiative recombination; Electroluminescence (EL); light-emitting diodes (LEDs); quantum-dot (QD) system devices;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2006.872288

Filename

1608198