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        我校蘇興華教授在材料領域頂級期刊《Advanced Materials》發表學術論文

        發布時間:2019-06-28作者:材料學院來源:材料學院字體: 設置

        我校材料學院無機非金屬材料工程系蘇興華教授和美國休斯敦大學包吉明教授,云南大學王茺研究員合作,在無機鈣鈦礦鉛鹵化合物材料領域的研究取得重要進展,并在材料領域國際頂級期刊《Advanced Materials》(IF:25.809)上發表題為“Extrinsic green photoluminescence from the edges of two-dimensional cesium leadhalides”的學術論文。蘇興華教授是該論文的共同第一作者。


        二維鈣鈦礦材料銫鉛溴具有優異的光電性能和物理化學穩定性,近年來受到研究人員的廣泛關注,但是其發光機理和禁帶寬度值,以及是屬于直接帶隙還是間接帶隙半導體等基本物理問題上,國際學術界一直都存在巨大爭議。為解決以上問題,論文作者采用化學法成功制備了銫鉛溴納米片和晶體,研究發現,只在納米片邊界和晶體顆粒表面發射強烈熒光。利用顯微熒光/拉曼的靜態探測技術,以及動態顯微熒光/拉曼測試技術(如圖1所示),再聯合完全相對論贗勢和自旋-軌道耦合效應的第一性原理計算,最終證實銫鉛溴邊界處的發光起源于其邊界處殘留的納米晶,而銫鉛溴晶體則是具有禁帶寬度值為3.45eV的間接帶隙半導體。該論文提出的這種將“靜態”和“動態”光譜相結合的方法,可以推廣到所有具有熒光活性材料的光學性質研究中,并對設計基于全無機鈣鈦礦材料的新型光電子器件具有重要意義。



        施加靜水壓測量銫鉛溴納米片熒光/拉曼的原理圖(左),不同壓力下的熒光光譜(右上),顯微熒光照片(右中)和拉曼光譜(右下)


        《AdvancedMaterials》是Wiley出版社發行的材料領域的頂級期刊,最新影響因子25.809,為JCR工程技術分區1區TOP期刊。論文鏈接為:https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201902492


        (供圖:材料學院  審稿:王振軍  網絡編輯:韓月)



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