Visible quantum cutting in green-emitting BaF2: Gd3+, Tb3+ phosphor: An approach toward mercury-free lamps

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY
Shreeniwas K. Omanwar , Shailesh R. Jaiswal , Niraj S. Sawala , Kishor A. Koparkar , Pankaj A. Nagpure , Vinod B. Bhatkar
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引用次数: 4

Abstract

Visible quantum cutting (QC) has been observed in green emitting BaF2 co-doped with Gd3+, Tb3+ phosphor via down-conversion (DC) synthesized by wet chemical method. Powder X-ray diffraction (XRD) analysis shows structural purity of synthesized phosphors. The excitation (PLE) and PL spectra in the vacuum ultraviolet (VUV) or UV region were measured with the help of 4B8-VUV spectroscopy experimental station of the Beijing Synchrotron Radiation Facility (BSRF). In the QC process, one VUV–UV photon absorbed is cut into more than one visible photons emitted by Tb3+ through cross relaxation (CR) and direct energy transfer (DET) between Tb3+ and Tb3+ or Tb3+ and Gd3+, depending on the excitation wavelength. From the emission spectra monitored at different wavelength excitation, the two-step energy transfer process is investigated and theoretically calculated quantum efficiency observed 148% and 177% at the excitation wavelength of 174 nm and 219 nm respectively.

绿色发光BaF2: Gd3+, Tb3+荧光粉的可见量子切割:迈向无汞灯的途径
通过湿化学法下转换(DC)合成的Gd3+, Tb3+荧光粉共掺杂的绿色发光BaF2,观察到可见的量子切割(QC)现象。粉末x射线衍射(XRD)分析表明了合成的荧光粉的结构纯度。利用北京同步辐射设施(BSRF)的4B8-VUV光谱实验站测量了真空紫外(VUV)和紫外区的激发(PLE)和PL光谱。在QC过程中,根据激发波长的不同,通过Tb3+与Tb3+或Tb3+与Gd3+之间的交叉松弛(CR)和直接能量转移(DET),将被吸收的一个uv - uv光子切割成Tb3+发射的多个可见光子。根据不同波长激发下监测到的发射光谱,研究了两步能量传递过程,理论计算的量子效率在激发波长为174 nm和219 nm处分别为148%和177%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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