Investigation on morphology and broadband blue-white emission modification of La_1−xBi_xOCl polycrystals

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• 作者：Rui HU (胡 锐)^a ; Yuting ZHOU (周玉婷)^a ; Zhiguo SONG (宋志国)^a ; ^{songzg@kmust.edu.cn} ; Yongjin LI (李永进)^a ; ^b ; Qun LIU (刘 群)^a ; Zuyuan XU (邝庆亮)^a ; Qingliang KUANG (邝庆亮)^a ; Qingfu ZHANG (张庆福)^a ; Jianbei QIU (邱建备)^a ; Zhengwen YANG (杨正文)^a
• 关键词：La1&ndash ; xBixOCl ; host luminescence ; self-doping ; layered structure ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：35
• 期：1
• 页码：53-57
• 全文大小：2401 K
• 卷排序：35

文摘

Tetragonal structure La1–xBixOCl polycrystals were prepared by solid state synthesis. With increase in bismuth content, the morphology of the prepared samples changed from non-oriented particles to layered crystals and the broadband blue-white emission from LaOCl polycrystals decreased dramatically. Comparative experiments and X-ray photoelectron spectroscopy (XPS) analysis indicated that the host emission more possibly originated from Cl self-doping in oxychloride crystals. According to a close composition relationship of the Cl self-doping behavior and crystal morphology, it was suggested that the La composition strengthened the interlayer interaction between Cl− anion and crystal cell lamellar, hindering the orientation of LaOCl crystals. The results of our work would deepen the understanding of the orientation structure of tetragonal oxyhalides and offer an insight into the origin of its host luminescence.