標題: Photoluminescence investigations on a novel green-emitting phosphor Ba3Sc(BO3)(3):Tb3+ using synchrotron vacuum ultraviolet radiation
作者: Wang, De-Yin
Chen, Yi-Chin
Huang, Chien-Hao
Cheng, Bing-Ming
Chen, Teng-Ming
應用化學系
Department of Applied Chemistry
公開日期: 2012
摘要: Vacuum ultraviolet (VUV) spectroscopic properties of undoped and Tb3+-doped Ba3Sc(BO3)(3) were investigated by using synchrotron radiation. The Tb3+-doped Ba3Sc(BO3)(3) sample crystallized in a flower-like shape even was synthesized at 1100 degrees C. Upon VUV excitation, Ba3Sc(BO3)(3) exhibited an intrinsic broad UV emission centered at 336 nm, which results from radiative annihilation of self-trapped exciton (STE) that may presumably be associated with band-gap excitations or molecular transitions within the BO33- group. The maximum host absorption for Ba3Sc(BO3)(3) was found at about 180 nm. Upon doping of Tb3+ ions into Ba3Sc(BO3)(3), an efficient energy transfer from the host excitations to Tb3+ via STE emission was observed, showing host sensitization of Tb3+ occurs. The energy transfer from host to Tb3+ via STE emission in Ba3Sc(BO3)(3):Tb3+ was studied as a function of temperature and Tb3+ doping concentration. It has been demonstrated that the energy transfer efficiency was increased with either increasing temperature or Tb3+ doping concentration. In the case of temperature dependent energy transfer, the energy transfer from the STE to Tb3+ is thermally activated, probably due to exciton mobility, while in the case of concentration dependent energy transfer, the energy transfer from the STE to Tb3+ is promoted due to a closer distance between the STE and Tb3+ at high Tb3+ concentration.
URI: http://hdl.handle.net/11536/16180
ISSN: 0959-9428
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 22
Issue: 19
結束頁: 9957
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