Abstract
The room-temperature blue cathodoluminescence (CL) from highly Er-dopedZnO thin films has been studied by using different electron beamcurrents (EBCs). The ZnO:Er thin films used in our experiment wereprepared by simultaneous evaporation from two sources. The x-raydiffraction spectra show that the thin films have a strong preferentialc-axis (0002) orientation with a hexagonal crystallinestructure. The blue emission at 455 nm originating from theintra-4f shell transition (4F5/2·4I15/2)in Er3+ ions was observed at room temperature. The nonlineardependence of the CL intensity on the EBC shows a more intense blueemission above the threshold EBC of 0.6 µA, which is attributed to thephonon bottleneck effect.
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