納米晶ZnO:Dy~(3+)粉體的制備和發(fā)光性質(zhì)

編號：NMJS00050

篇名：納米晶ZnO:Dy~(3+)粉體的制備和發(fā)光性質(zhì)

作者：張琳麗; 郭常新;

關(guān)鍵詞：ZnO:Dy; 光致發(fā)光; 固相反應法;

機構(gòu)： 西安建筑科技大學物理系; 中國科學技術(shù)大學物理系 西安;

摘要： 通過固相反應法制備了ZnO:Dy3+納米粉末,樣品的X射線衍射、透射電鏡和選區(qū)電子衍射證實了ZnO:Dy3+納米粉末屬于六方纖鋅礦多晶結(jié)構(gòu).研究了光致發(fā)光譜與激發(fā)波長和摻雜離子濃度的依賴關(guān)系.結(jié)果表明,從ZnO:Dy3+納米粉末的光致發(fā)光光譜中首次發(fā)現(xiàn)除了Dy3+的4f→4f躍遷外,出現(xiàn)了Dy摻入ZnO后產(chǎn)生的兩個缺陷A和B的寬譜帶發(fā)射峰,峰值分別在600和760nm,半高寬分別約為200和100nm.在ZnO的激子激發(fā)下(385nm),峰值760nm的發(fā)光強度遠遠大于峰值在600nm的發(fā)光強度.樣品的發(fā)射光譜中峰值的相對強度變化依賴于激發(fā)波長和Dy3+的摻雜濃度.當在Dy3+4f→4f激發(fā)下(454nm),光譜中只有Dy3+的4f態(tài)間的特征發(fā)射,而缺陷A,B不發(fā)光. ZnO:Dy3+ nanocrystals have been synthesized by solid state reaction.X-ray diffraction(XRD),transmission electron microscopy(TEM),and selected area electronic diffraction(SAED)demonstrate that the nanocrystals can be indexed as hexagonal wurtzite polycrystalline.The photoluminescence spectra(PL)and photoluminescence excitation spectra(PLE)of the nanocrystals were measured at room temperature.The grain size of the nanocrystals is about 50nm as calculated using the Debye-Scherrer formula.We have found that in ...