新型 BaGd2O4:Eu3+ 闪烁体的合成与发光性能。

Synthesis and luminescent properties of novel BaGd2O4:Eu3+ scintillating phosphor.

机构信息

Department of Physics, Jinggangshan University, Ji'an, 343009, People's Republic of China or China.

出版信息

Luminescence. 2013 May-Jun;28(3):384-91. doi: 10.1002/bio.2394. Epub 2012 Jul 18.

Abstract

BaGd2-x O4:xEu(3+) and Ba1-y Gd1.79-2y Eu0.21 Na3y O4 phosphors were synthesized at 1300°C in air by conventional solid-state reaction method. Phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence excitation (PLE) spectra, photoluminescence (PL) spectra and thermoluminescence (TL) spectra. Optimal PL intensity for BaGd2-x O4 :xEu(3+) and Ba1-y Gd1.79-2y Eu0.21 Na3y O4 phosphors at 276 nm excitation were found to be x = 0.24 and y = 0.125, respectively. The PL intensity of Eu(3+) emission could only be enhanced by 1.3 times with incorporation of Na(+) into the BaGd2 O4 host. Enhanced luminescence was attributed to the flux effect of Na(+) ions. However, when BaGd2 O4:Eu(3+) phosphors were codoped with Na(+) ions, the induced defects confirmed by TL spectra impaired the emission intensity of Eu(3+) ions.

摘要

BaGd2-x O4:xEu(3+) 和 Ba1-y Gd1.79-2y Eu0.21 Na3y O4 荧光粉通过传统的固态反应法，在空气中于 1300°C 下合成。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、光致发光激发（PLE）光谱、光致发光（PL）光谱和热致发光（TL）光谱对荧光粉进行了表征。在 276nm 激发下，BaGd2-x O4:xEu(3+) 和 Ba1-y Gd1.79-2y Eu0.21 Na3y O4 荧光粉的最佳 PL 强度分别为 x = 0.24 和 y = 0.125。Na(+)掺入 BaGd2 O4 基质中仅能将 Eu(3+)发射的 PL 强度增强 1.3 倍。发光增强归因于 Na(+)离子的助熔剂效应。然而，当 BaGd2 O4:Eu(3+) 荧光粉共掺 Na(+)离子时，TL 光谱证实的诱导缺陷会损害 Eu(3+)离子的发射强度。