Broadband, site selective and time resolved photoluminescence spectroscopic studies of finely size-modulated Y<sub>2sub>O<sub>3sub>:Eu<sup>3+sup> phosphors synthesized by a complex based precursor solution method

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• 作者：Sudeshna Ray ; Sergio Fabi谩n Le贸n-Luis ; Francisco Javier Manj贸n ; Miguel Alfonso Mollar ; 脫scar Gomis ; Ulises Ruym谩n Rodr铆guez-Mendoza ; Said Agouram ; Alfonso Mu帽oz ; Victor Lav铆n
• 关键词：Nanophosphor ; Size-modulated synthesis ; Structure ; Raman ; Photoluminescence ; Eu3+
• 刊名：Current Applied Physics
• 出版年：January, 2014
• 年：2014
• 卷：14
• 期：1
• 页码：72-81
• 全文大小：1502 K

文摘

Undoped and Eu<sup>3+sup>-doped cubic yttria (Y<sub>2sub>O<sub>3sub>) nanophosphors of good crystallinity, with selective particle sizes ranging between 6 and 37聽nm and showing narrow size distributions, have been synthesized by a complex-based precursor solution method. The systematic size tuning has been evidenced by transmission electron microscopy, X-ray diffraction, and Raman scattering measurements. Furthermore, size-modulated properties of Eu<sup>3+sup> ions have been correlated with the local structure of Eu<sup>3+sup> ion in different sized Y<sub>2sub>O<sub>3sub>:Eu<sup>3+sup> nanophosphors by means of steady-state and time-resolved site-selective laser spectroscopies. Time-resolved site-selective excitation measurements performed in the <sup>7sup>F<sub>0sub>聽鈫捖?sup>5sup>D<sub>0sub> peaks of the Eu<sup>3+sup> ions at C<sub>2sub> sites have allowed us to conclude that Eu<sup>3+sup> ions close to the nanocrystal surface experience a larger crystal field than those in the nanocrystal core. Under the site-selective excitation in the <sup>7sup>F<sub>0sub>聽鈫捖?sup>5sup>D<sub>0sub> peaks, energy transfer between the sites has also been observed.