高压下Na5Tb(WO4)4单晶的光谱

研究了Na5Tb(WO4)4单晶的高压发光规律,化学计量的Na5Tb(WO4)4基质发光单晶的发光来源于基质中高浓度Tb3+.用金刚石对顶砧显微光谱系统在0-4GPa范围内研究了Na5Tb(WO4)4的室温高压光谱,确定了各发射谱线的高压移动率.对Tb3+的5D4→7Fj(j=0,1,2,3,4,5),测到18条谱线高压移动率中除一条(5D4→7F2,常压峰值15509cm-1)蓝移外,都红移,红移率最大为-19.5cm-1/GPa(对应谱线5D4→7F4,常压峰值16876cm-1),与Tb3+在其它基质中相比,此移动率很大.

HIGH PRESSURE SPECTRA OF Na_5Tb(WO_4)_4 CRYSTAL

In this paper.luminescent spectra of Na5Tb(WO4)4 crystal under hydrostatic high pressure 0-4GPa have been studied.The crystal of Na5Tb(WO4)4 is a stoichiometric host luminescent crystal,its light emission comes from Tb3+ ions having high concentration (weight concentration 12.6%).The high pressure spectra of Na5Tb(WO4)4 atroom temperature have been investegated by using a high pressure microspectroscopic system in conjunction with a gasketed diamond anvil optical cell.For transitions 5D4→7Fj(j=0,1,2,3,4,5) of Tb3+,the pressure shifts of 18 fluorescent lines have been determined.In which,all lines have red shift,except that one (5D4→7F2,15509cm-1 at 1 atpomosphere) has blue shif.The largest pressure red shift rate of these fluorescent lines is -19.5cm-1/GPa (5D4→7F4,16876cm-1 at 1 atmosphere),in comparison with the results of Tb3+ in other crystals.this is a very high pressure shift rate for trivalent rare earth ions.