掺铥硫氧化钇的特殊余辉性质

迄今为止,稀土长余辉磷光体已见文献或专利公开报道的激活离子主要有适于紫外光激发的三价铈离子(Ce³⁺)和三价镨离子(Pr³⁺)、适于可见光激发的铕离子(Eu³⁺和Eu²⁺)及钐离子(Sm³⁺,Sm²⁺),尚未涉及到铥离子Tm³⁺或Tm²⁺.我们在Tm³⁺离子激活的硫氧化钇体系Y₂O₂S:Tm³⁺中发现了长余辉荧光特性.特别是在该磷光体中还发现了一种非常特殊的余辉现象.

Unusual Afterglow Properties of Tm3+ Doped Yttrium Oxysulfide

One bright unusual afterglow has been observed for the first time in the Tm3 doped yttrium oxysulfide phosphors synthesized by flux fusion method. When the phosphors are illuminated with UV light (263 nm) or visible light, one bright orange-yellow light can be seen in the darkroom lasting for about one hour. The bright orange-yellow afterglow light is a mixture of six main emissions including 470, 495) 516, 545, 588 and 626 nm, which can be attributed to the 4f-4f transition emissions of Tm3 in Y2O2S. One conclusion can be drawn from the phosphorescence spectra and the afterglow decay curve that the Tm3 doped yttrium oxysulfide is a new phosphor with good afterglow properties. The Tm3 doped yttrium oxysulfide not only shows afterglow when excited by UV light or visible light, but also create obviously upcon version afterglow emission peak located at 545 nm when it was excited by near infrared light (798 nm). This unusual afterglow phenomenon maybe finds some new application of the long-lasting phosphor and opens a new field of phosphor research.