Pressure behaviour of the UV and green emission bands in ZnO micro-rods

G. H. Li*, F. H. Su, W. J. Wang, K. Ding, W. Chen, Y. F. Liu, A. G. Joly

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The pressure behavior of the ultraviolet (UV) and green emission bands in ZnO tetrapod-like micro-rods has been investigated at 300 and 70 K, respectively. The pressure coefficient of the UV band at 300 K is 24.5 meV/GPa, consistent with that of the band gap of bulk ZnO. However, the pressure coefficient of the green band is 25 meV/GPa, far larger than previous literature reports. The green band in this work originates from Cu-related emission, as confirmed by the fine structure observed in the spectra at 10 K. The pressure coefficients of four phonon replicas of the free exciton emission (FX) at 70 K are 21.0, 20.2, 19.8, and 19.3 meV/GPa, respectively. The energy shift rate of the FX emission and the LO phonon energies is then determined to be 21.4 and 0.55 meV/GPa. The pressure coefficient of the neutral donor bound exciton (D°X) transition is 20.5 meV/GPa, only 4% smaller than that of FX. This confirms that the D°X emission corresponds to excitons bound to neutral shallow donors.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalPhysica Status Solidi (B) Basic Research
Issue number1
Publication statusPublished - Jan 2007
Externally publishedYes


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