利用能量传递实现可调全色单一白光BaMg2Al6Si9O30∶Eu2＋,Tb3＋,Mn2＋荧光粉(特邀)

Color-tunable white-light emitting BaMg_2Al_6Si_9O_(30):Eu^(2+),Tb^(3+),Mn^(2+) phosphors via energy transfer(Invited)

利用高温固相法制备了全色单一白光BaMg2Al6Si9O30∶Eu2+,Tb3+,Mn2+荧光粉。通过对其荧光光谱,能量传递效率,以及荧光寿命的研究,证实了Eu2+-Mn2+和Eu2+-Tb3+之间存在能量传递。在此体系中,白光由450,540和610 nm的3个谱带组成,分别来源于Eu2+,Tb3+,Mn2+的发射。通过控制Tb3+/Mn2+的相对含量,可以得到色坐标为(0.31,0.30),显色指数为90,色温为5 374 K的白光。因此,该单一白光荧光粉在白光照明领域具有潜在的应用前景。

Single-phase white-light emitting phosphors BaMg2Al6Si9O30∶ Eu2＋,Tb3＋,Mn2＋ are synthesized by solid state reaction.The energy transfers from Eu2＋ to Tb3＋ and Eu2＋ to Mn2＋ in BaMg2Al6Si9O30 are demonstrated by fluorescent spectra,energy transfer efficiency and fluorescent life time analysis.The BaMg2Al6Si9O30∶ Eu2＋,Tb3＋,Mn2＋ shows three emitting colors： 450,542 and 610 nm,which are assigned to the contribution from Eu2＋,Tb3＋ and Mn2＋,respectively.By tuning the relative composition of Tb3＋/Mn2＋,chromaticity coordinates of（0.31,0.30）,color rendering index Ra=90 and Correlated Color Temperature（CCT） of 5 374 K can be achieved upon the excitation of UV light.Experimental results indicate that the present phosphor BaMg2Al6Si9O30∶ Eu2＋,Tb3＋,Mn2＋ can serve as potential candidates for light emitting diodes.