Tailoring the Luminescence of Europium Ions in Mesoporous AlPO4 Monolithic Glass

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• 作者：Jin He ; Yan Wang ; Yang Liu ; Kangpeng Wang ; Rihong Li ; Jintai Fan ; Shiqing Xu ; Long Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 24, 2013
• 年：2013
• 卷：117
• 期：42
• 页码：21916-21922
• 全文大小：392K
• 年卷期：v.117,no.42(October 24, 2013)
• ISSN：1932-7455

文摘

Controllable simultaneous luminescent monolithic mesoporous AlPO₄ glasses doped with Eu ions were fabricated by dipping into a Eu-containing solution, followed by sintering in air. Reduction of partial Eu³⁺ ions to Eu²⁺ were achieved after annealing Eu³⁺ ions in AlPO₄ meso-structure, which resulted in simultaneous luminescence of Eu³⁺ (590 and 613 nm) and Eu²⁺ (450 nm). Controllable luminescence and color tunability from blue to red were liable to obtain, which were characterized by emission spectra and described by CIE diagram. A deliberate tailoring of luminescence of Eu²⁺ and Eu³⁺ is achieved by controlling the Eu ions concentrations, sintering temperatures, and excitation wavelengths. Reduction and oxidation reactions of Eu ions were investigated by controlling the sintering atmospheres. XRD pattern indicated the typical amorphous glassy phase without obvious phase-separation even in high concentration (0.1 M). The presence of Eu²⁺ ions, which were reduced from Eu³⁺ by hole鈥揺lectron pairs and diffused into mesoporous structure, was revealed by XPS spectra.