Blue and ultraviolet cathodoluminescence from Mn-doped epitaxial ZnO thin films

Jin, Zheng-Wu; Yoo, Y.-Z.; Sekiguchi, T.; Chikyow, T.; Ofuchi, H.; Fujioka, H.; Oshima, M.; Koinuma, H.
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p39
Academic Journal
Combinatorial laser molecular-beam epitaxy method was employed to fabricate epitaxial Zn[SUB1-x]Mn[SUBx]O thin films in a high throughput fashion. Local structures around Mn were investigated for these c-axis-oriented epitaxial films by fluorescence x-ray absorption fine structure (measurements. It was shown that Mn substitutionally replaces Zn in Zn[SUB1-x]Mn[SUBx]O(x<0.22) films. Well-structured blue and ultraviolet cathodoluminescence peaks corresponding to the intra-d-shell transitions of Mn[SUP2+] were observed, especially for smaller x. The luminescence is quenched rapidly as x is increased. By comparing the relative absorption strength per mole Mn[SUP2+] with the statistical probability of isolated Mn[SUP2+], it was concluded that the quick decrement of isolated Mn[SUP2+] with increasing x is responsible for the severe suppression of the blue and ultraviolet luminescence.


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