Effect of hole transport on performance of infrared type-II superlattice light emitting diodes

The effect of hole transport on the performance of infrared light emitting diodes (LED) was investigated. The active area of the LEDs comprised two type-II superlattices with different periods and widths connected in series. Electroluminescence spectra of the devices with different positions of long...

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Bibliographic Details
Published in:Journal of applied physics 2015-04, Vol.117 (16)
Main Authors: Lin, Youxi, Suchalkin, Sergey, Kipshidze, Gela, Hosoda, Takashi, Laikhtman, Boris, Westerfeld, David, Shterengas, Leon, Belenky, Gregory
Format: Article
Language:English
Subjects:
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFUSION
Diffusion barriers
Diffusion coefficient
Electric contacts
ELECTROLUMINESCENCE
Electron recombination
ELECTRONS
EMISSION SPECTRA
HOLES
INFRARED RADIATION
LIGHT EMITTING DIODES
Organic light emitting diodes
RECOMBINATION
SUPERLATTICES
Transport
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Summary:The effect of hole transport on the performance of infrared light emitting diodes (LED) was investigated. The active area of the LEDs comprised two type-II superlattices with different periods and widths connected in series. Electroluminescence spectra of the devices with different positions of long wave and mid wave superlattice sections were mostly contributed by the superlattice closest to the p-contact. The experimental results indicate that due to suppressed vertical hole transport, the recombination of electrically injected electrons and holes in a type II superlattice LED active region takes place within a few superlattice periods near p-barrier. Possible reason for the effect is reduction of hole diffusion coefficient in an active area of a superlattice LED under bias.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4919070