TY - JOUR
T1 - Pressure behaviour of the UV and green emission bands in ZnO micro-rods
AU - Li, G. H.
AU - Su, F. H.
AU - Wang, W. J.
AU - Ding, K.
AU - Chen, W.
AU - Liu, Y. F.
AU - Joly, A. G.
PY - 2007/1
Y1 - 2007/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33847012200&partnerID=8YFLogxK
U2 - 10.1002/pssb.200672545
DO - 10.1002/pssb.200672545
M3 - Article
AN - SCOPUS:33847012200
SN - 0370-1972
VL - 244
SP - 87
EP - 92
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
IS - 1
ER -