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个人信息Personal Information
教授
博士生导师
硕士生导师
性别：男
毕业院校：复旦大学
学位：博士
所在单位：物理学院
学科：凝聚态物理
办公地点：大连理工大学三束材料改性重点实验室1号楼203房间
联系方式：qyzhang@dlut.edu.cn 0411-84707930 转 13
电子邮箱：qyzhang@dlut.edu.cn
Enhanced photoluminescence of Co2+ ions in ZnCoO/ZnMgO multiple quantum wells and the fluorescence energy transfer mechanism
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论文类型：期刊论文
发表时间：2015-02-01
发表刊物：JOURNAL OF LUMINESCENCE
收录刊物：SCIE、EI
卷号：158
页面范围：211-214
ISSN号：0022-2313
关键字：ZnCoO/ZnMgO MQWs; PL; PL quenching; FRET
摘要：Using a pulsed laser deposition system, ZnCoO/ZnMgO multiple quantum well (MQW) samples were grown on c-plane sapphire substrate with similar to 20.nm thick ZnO buffer layer. Compared with monolayer ZnCoO film, the MQW samples exhibited obviously enhanced Co2+ photoluminescence (PL) at similar to 1.80 eV and multiple-phonon resonant Raman scattering (RRS). The enhancement in multiple-phonon RRS was due to the introduction of ZnMgO barrier layer. The enhanced Co2+ PL was assigned to the quantum confinement effect (QCE) of MQW samples. However, QCE was found not helpful to prevent the band-gap PL quenching. Co2+ 3d electronic states were proved to be highly localized and a mechanism of fluorescence resonance energy transfer (FRET) between ZnO excitons and the localized Co2+ 3d states was proposed. (C) 2014 Elsevier B.V. All rights reserved.