Synthesis of Y2O2S:Eu3+, Mg2+, Ti4+ hollow microspheres via homogeneous precipitation route

• Published in: Science and technology of advanced materials Vol. 11; no. 3; p. 035002
• Main Authors: Ai, Peng-Fei, Liu, Ying-Liang, Xiao, Li-Yuan, Wang, Hou-Jin, Meng, Jian-Xin
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.06.2010; IOP Publishing; Taylor & Francis Group
• Subjects: hollow microsphere; homogeneous precipitation method; luminescence; yttrium oxysulfide
• ISSN: 1468-6996; 1878-5514
• DOI: 10.1088/1468-6996/11/3/035002

A phosphorescent material in the form of Y 2 O 2 S:Eu 3+ , Mg 2+ , Ti 4+ hollow microspheres was prepared by homogeneous precipitation using monodispersed carbon spheres as hard templates. Y 2 O 3 :Eu 3+ hollow microspheres were first synthesized to serve as the precursor. Y 2 O 2 S:Eu 3+ , Mg 2+ , Ti 4+ powders were obtained by calcinating the precursor in a CS 2 atmosphere. The crystal structure, morphology and optical properties of the composites were characterized. X-ray diffraction measurements confirmed the purity of the Y 2 O 2 S phase. Electron microscopy observations revealed that the Y 2 O 2 S:Eu 3+ , Mg 2+ , Ti 4+ particles inherited the hollow spherical shape from the precursor after being calcined in a CS 2 atmosphere and that they had a diameter of 350-450 nm and a wall thickness of about 50-80 nm. After ultraviolet radiation at 265 or 325 nm for 5 min, the particles emitted strong red long-lifetime phosphorescence originating from Eu 3+ ions. This phosphorescence is associated with the trapping of charge carriers by Ti 4+ and Mg 2+ ions.