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Room-temperature luminescence of excitons in ZnO/(Mg, Zn)O multiple quantum wells on lattice-matched substrates.
- Source :
- Applied Physics Letters; 8/14/2000, Vol. 77 Issue 7, 1 Diagram, 5 Graphs
- Publication Year :
- 2000
-
Abstract
- We report on the optical properties of ZnO/(Mg, Zn)O multiple quantum wells (MQWs) on lattice-matched ScAlMgO[sub 4] substrates fabricated by laser molecular-beam epitaxy. As the well layer thickness decreased down to 7 Å, the photoluminescence (PL) and absorption peaks showed a systematic blueshift, consistent with the quantum-size effect. Moreover, a bright PL of free excitons could be observed even at room temperature. As a result, the PL could be tuned in the energy range of 3.3-3.6 eV by choosing the appropriate barrier height and well layer thickness. The widest tunability on the room-temperature luminescence of the excitons could be attained on the basis of the ZnO quantum structure. These favorable properties could not be attained in the MQWs on lattice-mismatched sapphire substrates. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- QUANTUM wells
LATTICE dynamics
EPITAXY
PHOTOLUMINESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 77
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 4413907
- Full Text :
- https://doi.org/10.1063/1.1289066