| Original Articles |
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Blue Cathodoluminescence from Highly Er-Doped ZnO Thin Films Induced by the Phonon Bottleneck Effect |
| ZHANG Xi-Tian1,2;LIU Yi-Chun2,3;MA Jian-Gang2;LU You-Ming2;SHEN De-Zhen2;XU Wub2;ZHONG Guo-Zhu2;FAN Xi-Wu2 |
| 1Department of Physics, Harbin Normal University, Harbin 150080
2Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130021
3Institute of Theoretical Physics, Northeast Normal University, Changchun 130024 |
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| Cite this article: |
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ZHANG Xi-Tian, LIU Yi-Chun, MA Jian-Gang et al 2003 Chin. Phys. Lett. 20 401-403 |
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Abstract The room-temperature blue cathodoluminescence (CL) from highly Er-doped ZnO thin films has been studied by using different electron beam currents (EBCs). The ZnO:Er thin films used in our experiment were prepared by simultaneous evaporation from two sources. The x-ray diffraction spectra show that the thin films have a strong preferential c-axis (0002) orientation with a hexagonal crystalline structure. The blue emission at 455 nm originating from the intra-4f shell transition (4F5/2.4I15/2) in Er3+ ions was observed at room temperature. The nonlinear dependence of the CL intensity on the EBC shows a more intense blue emission above the threshold EBC of 0.6μA, which is attributed to the phonon bottleneck effect.
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| Keywords:
71.20.Eh
78.60.Hk
78.60.Hf
81.15.Jj
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Published: 01 March 2003
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| PACS: |
71.20.Eh
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(Rare earth metals and alloys)
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78.60.Hk
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(Cathodoluminescence, ionoluminescence)
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78.60.Hf
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81.15.Jj
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(Ion and electron beam-assisted deposition; ion plating)
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