利用助熔剂硼酸延长SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+)荧光粉的余辉长度

Extend Afterglow Time of SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+) Phosphor by Adding Boric Acid as Flux

通过高温固相反应法合成具有锶长石结构的层状SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+)荧光粉。结果表明:该荧光粉可被276 nm的紫外光激发,产生1个峰值在426 nm的宽发射带。共掺杂的Dy^(3+)进入陷阱中心,不影响晶体结构和发射峰位置变化,帮助促进持续的发光。SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+)荧光粉具有出色的热稳定性,在200℃时可保持90.5%的初始发光强度。H_(3)BO_(3)助熔剂的添加不会影响荧光粉的晶体结构,并且帮助提高发光强度并延长余辉寿命。加入助熔剂后,荧光粉寿命可以达到122.3 s,量子效率提高30.2%。SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+)荧光粉在未来长余辉发光二极管(Light Emitting Diodes,LED)领域中具有发展潜力。

Long afterglow phosphors are widely used in fields such as optical storage and photocatalysis.Aluminosilicate has the advantages of good physical and chemical stability,thermal stability,high light conversion rate,low cost and emission bandwidth.The layered SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+) phosphors with strontium feldspar structure were synthesized by high-temperature solid-state reaction method.The phosphor can be excited by 276 nm ultraviolet light to produce a broad emission band with a peak at 426 nm.Co-doped Dy^(3+) ions do not affect the crystal structure and emission peak position.Dy3+is imported into the trap center to cause continuous light emission.The phosphor has excellent thermal stability,and it can maintain 90.5%of the initial luminous intensity at 200℃.The addition of H3BO3 flux does not affect the crystal structure.It improves the luminous intensity and prolongs the afterglow lifetime.After adding the flux,the lifetime can reach 122.3 s,and the quantum efficiency is increased by 30.2%.The luminous characteristics and afterglow lifetime can indicate that SrAl_(2)Si_(2)O_(8):Eu^(2+),Dy^(3+) phosphors have development potential in the field of long afterglow light emitting diodes(LEDs)in the future.