Photoluminescent Rare-Earth Based Biphenolate Lamellar Nanostructures
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- 作者：Mohamed Karmaoui ; Luí ; s Mafra ; Rute A. Sá ; Ferreira ; Joã ; o Rocha ; Luí ; s D. Carlos ; Nicola Pinna
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：February 15, 2007
- 年：2007
- 卷：111
- 期：6
- 页码：2539 - 2544
- 全文大小：307K
- 年卷期：v.111,no.6(February 15, 2007)
- ISSN：1932-7455
文摘
A general nonaqueous route has been applied for the preparation of rare-earth ordered nanocrystalline hybridstructures. In a simple one-pot reaction process, Y3+ and Gd3+ isopropoxides were reacted in an autoclavewith 4-biphenylmethanol at 275 
C. This approach leads to crystalline rare-earth oxide thin layers (~0.6 nm)regularly separated from each other by organic layers of biphenolate molecules. The optical properties ofthese hybrid materials doped with Eu3+ and Nd3+, which are optical active lanthanides ions emitting in thered and near infrared, respectively, are presented. They show significant advantages compared to standardphosphors, such as higher radiance and luminance values, the possibility to tune the emission chromaticityby varying the excitation wavelength, and a much larger excitation range (250-350 nm and 300-500 nm forthe Eu3+ and Nd3+ doped nanohybrids, respectively) shifted toward the red.
C. This approach leads to crystalline rare-earth oxide thin layers (~0.6 nm)regularly separated from each other by organic layers of biphenolate molecules. The optical properties ofthese hybrid materials doped with Eu3+ and Nd3+, which are optical active lanthanides ions emitting in thered and near infrared, respectively, are presented. They show significant advantages compared to standardphosphors, such as higher radiance and luminance values, the possibility to tune the emission chromaticityby varying the excitation wavelength, and a much larger excitation range (250-350 nm and 300-500 nm forthe Eu3+ and Nd3+ doped nanohybrids, respectively) shifted toward the red.