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Er-Tm codoped amorphous aluminum oxide(a-Al2O3)thin films have been prepared by an alternative pulsed laser deposition.The phase structure and the surface of the deposited thin films were characterized by the X-ray diraction(XRD)and scanning electron microscopy(SEM),respectively.Eective photoluminescence(PL)in the region of 350-900 nm was observed when pumped at 325 nm,and the PL performance has been improved by modifying the Tm3 +concentration.With the increasing of[Tm]/[Er]concentra-tion ratio,the intensity of emission of 382 nm and 500 nm bands was improved eectively while that of 765 nm band increased smoothly.Our results suggest that the resonant energy transfer and cross relaxation between Tm3 +and Er 3+play an important role in the evolution of the luminescent response.
Er-Tm codoped amorphous aluminum oxide (a-Al2O3) thin films have been prepared by an alternative pulsed laser deposition. The phase structure and the surface of the deposited thin films were characterized by the X-ray diraction (XRD) and scanning electron microscopy (SEM), respectively. The photoluminescence (PL) in the region of 35-900 nm was observed when pumped at 325 nm, and the PL performance has been improved by modifying the Tm3 concentration.With the increasing of [Tm] / [ Er] concentra tion ratio, the intensity of emission of 382 nm and 500 nm bands was improved eectively while that of 765 nm band ups smoothly. Our results suggest that the resonant energy transfer and cross relaxation between Tm3 + and Er3 + play an important role in the evolution of the luminescent response