Photoluminescence of ZnSe/ZnMnSe superlattices under hydrostatic pressure

Judah A. Tuchman, Zhifeng Sui, Sangsig Kim, Irving P. Herman

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8 Citations (Scopus)

Abstract

Photoluminescence near 4450 Å (violet) and 5900 Å (yellow) from ZnSe/Zn1-xMnxSe strained-layer superlattices (SLS) is studied as a function of applied hydrostatic pressure up to ∼90 kbar for x=0.23, 0.33, and 0.51 at 9 K. For each of the three SLSs, the peak energy of the near-band-gap violet photoluminescence (PL) from exciton recombination increases sublinearly with pressure, and closely follows that of ZnSe. The observed dependence is consistent with type-I band alignment, at least at pressures where the violet PL intensity remains strong. For the x=0.23 SLS, the energy of the biexciton PL increases faster than that of the exciton, which suggests decreased confinement. The yellow PL is due to the 4T 16A1 intraionic transition in Mn 2+ and the nearly linear decrease of the peak energy of this signal with pressure is explained by crystal-field theory. In most cases examined, the intensities of the violet and/or yellow PL decrease abruptly above a certain pressure that increases with x from ∼65 to ∼90 kbar. For the different cases, this suggests either the occurrence of a phase transition in the Zn xMn1-xSe layers or a band crossing.

Original languageEnglish
Pages (from-to)7730-7738
Number of pages9
JournalJournal of Applied Physics
Volume73
Issue number11
DOIs
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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