Time-resolved photoluminescence of coupled GaAs/AlGaAs quantum wells

Authors

Jennette N. Mateo ⋅ PH National Institute of Physics, University of the Philippines Diliman
Florencio D. Recoleto, Jr. ⋅ PH National Institute of Physics, University of the Philippines Diliman
Arnel A. Salvador ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Room temperature time resolved photoluminescence (PL) was performed on a coupled GaAs/AlGaAs asymmetric quantum wells (AQW). By applying reverse bias, the electronic states of the wide well (WW) and narrow well (NW) were brought into resonance. Spatially direct and indirect transitions were observed. The PL decay times at different applied reverse biases were determined from the streak images. An abrupt decrease in the decay time of the direct transition at –3V was attributed to resonant tunneling. At resonance, the PL decay time of the direct transition (3.2 ns) is less than that of the indirect transition (7.3 ns). This is an evidence of tunneling.
After resonance, the PL decay time of the direct transition decreased further to 2.5 ns. This is attributed to non-resonant tunneling via acoustic phonons.

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Issue

2005: Proceedings of the 23rd Samahang Pisika ng Pilipinas Physics Congress

Article ID

SPP-2005-2F-04

Section

Materials Science

Published

2005-10-26

How to Cite

[1]

JN Mateo, FD Recoleto, and AA Salvador, Time-resolved photoluminescence of coupled GaAs/AlGaAs quantum wells, Proceedings of the Samahang Pisika ng Pilipinas 23, SPP-2005-2F-04 (2005). URL: https://proceedings.spp-online.org/article/view/SPP-2005-2F-04.