2.7 渭m Emission from Transparent Er3+,Tm3+ Codoped Yttrium Aluminum Garnet (Y3Al5O12) Nanocrystals鈥揟ellurate Glass Composites by Novel Comelting

详细信息    查看全文

• 作者：Guanqi Chai ; Guoping Dong ; Jianrong Qiu ; Qinyuan Zhang ; Zhongmin Yang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：September 20, 2012
• 年：2012
• 卷：116
• 期：37
• 页码：19941-19950
• 全文大小：656K
• 年卷期：v.116,no.37(September 20, 2012)
• ISSN：1932-7455

文摘

Yttrium aluminum garnet Y₃Al₅O₁₂ (YAG):Er³⁺,Tm³⁺ phosphor powders with preferable luminescent properties and nanocrystals with better morphology were synthesized by the solid-state reaction method and coprecipitation method, respectively. The composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), which showed that the nanocrystals were pseudomonodispersed with the particle size of 30 nm. Photoluminescence (PL) spectra indicated the 2.7 渭m emission of Er³⁺ was remarkably enhanced via Tm³⁺ sensitization, and a novel circulatory energy transfer mechanism was proposed. A novel dehydration method was used to decrease the contents of the hydroxyl group (OH^{鈥?/sup>) confirmed by photoluminescence spectra and Fourier transform infrared spectra (FTIR). YAG crystallites were introduced into tellurate glass and formed to glass composites with good optical performance. These nanocrystals鈥揼lass composites open a brand new field for the research of mid-infrared laser materials.}