Photoluminescence of pyrochlore phase in SrBi[sub 2]Ta[sub 2]O[sub 9] thin films

Wang, Y. P.; Ning, H. F.; Zhou, L.; Shen, J. K.; Liu, Z. G.
July 2003
Applied Physics Letters;7/28/2003, Vol. 83 Issue 4, p743
Academic Journal
SrBi[sub;2]Ta[sub;2]O[sub;9] thin films were prepared by pulsed laser deposition at different substrate temperatures. Photoluminescence (PL) has been detected at room temperature from the pyrochlore phase in the SrBi[sub;2]Ta[sub;2]O[sub;9] film deposited at 850 ?C. The PL shows five luminescence bands of 330, 365, 407, 490, and 600 nm. And the PL excitation shows six excitation bands of 278, 330, 365, 407, 490, and 600 nm. The one-to-one correspondence of PL and PL excitation spectra reveals a band-to-band (excitation and a multienergy-gap structure in the pyrochlore phase in SrBi[sub;2]Ta[sub;2]O[sub;9] films.


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