KLaF₄:Er an efficient upconversion phosphor

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• 作者：Neetu Tyagi ; A. Amarnath Reddy ; R. Nagarajan
• 关键词：Photoluminescence ; Upconversion ; Diffuse reflectance spectra ; Excited state absorption ; Energy Transfer Upconversion
• 刊名：Optical Materials
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：33
• 期：1
• 页码：42-47
• 全文大小：957 K

文摘

Er³⁺ doped cubic KLaF₄ system is reported as a promising green-emitting phosphor, obtained from a single step non-aqueous medium based room temperature synthesis. The optical properties of the doped systems were evaluated by diffuse reflectance spectroscopy and photoluminescence spectroscopy under laser excitation. The green to red emission ratio (GRR) of 4.9 with a decay time range of 35–70 ms (for green emission at 522 nm, under 980 nm excitation) has been achieved in the KLaF₄:Er for the first time. This study proves beneficial for many applications including in vivo bio-labeling, 3D flat panel displays and provides a broader scope for further improvement in its upconversion properties through site selective doping.