CAJ | 학술논문

采用凝胶-燃烧法在活性炭弱还原气氛下成功合成了新型荧光粉Sr2MgSi3O9 :Tb3+、Sr2MgSi3O9:Ce3+,Tb3+,用X射线粉末衍射仪(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物进行了分析和表征.结果表明,所合成的发光材料与Sr2MgSi2O7具有相似的晶体结构,同属四方晶系.样品一次颗粒近似球形,粒径在100nm左右.Sr2MgSi3O9:Tb3+的激发光谱为一位于249nm的宽带,发射光谱主要由473、491、547、585nm等一系列发射峰组成,其中473nm(5D3→<7F3)为主发射峰,547nm(5D4→7F5)为次发射峰;样品Sr1.955MgSi3O9:Tb3+0.04,Ce3+0.005的激发光谱由峰值分别位于249和335nm的双激发带组成,其中后者为主激发带.在335nm激发下,其发射光谱由两部分组成,其中400nm附近的带状发射对应于Ce3+的发射,而491、547、588nm处的发射峰归属为Tb3+的5+D4→7FJ(J=6,5,4)跃迁发射,最强峰位于547nm,对应Tb3+的5D4→7F5跃迁.此外,探讨了Ce3+掺杂量对样品发光亮度的影响,发现Ce3+可以把能量传递给Tb3+,对Tb3+起到敏化作用.
채용응효-연소법재활성탄약환원기분하성공합성료신형형광분Sr2MgSi3O9 :Tb3+、Sr2MgSi3O9:Ce3+,Tb3+,용X사선분말연사의(XRD)、소묘전경(SEM)、형광분광광도계등대합성산물진행료분석화표정.결과표명,소합성적발광재료여Sr2MgSi2O7구유상사적정체결구,동속사방정계.양품일차과립근사구형,립경재100nm좌우.Sr2MgSi3O9:Tb3+적격발광보위일위우249nm적관대,발사광보주요유473、491、547、585nm등일계렬발사봉조성,기중473nm(5D3→<7F3)위주발사봉,547nm(5D4→7F5)위차발사봉;양품Sr1.955MgSi3O9:Tb3+0.04,Ce3+0.005적격발광보유봉치분별위우249화335nm적쌍격발대조성,기중후자위주격발대.재335nm격발하,기발사광보유량부분조성,기중400nm부근적대상발사대응우Ce3+적발사,이491、547、588nm처적발사봉귀속위Tb3+적5+D4→7FJ(J=6,5,4)약천발사,최강봉위우547nm,대응Tb3+적5D4→7F5약천.차외,탐토료Ce3+참잡량대양품발광량도적영향,발현Ce3+가이파능량전체급Tb3+,대Tb3+기도민화작용.
Novel phosphors Sr2 MgSi3O9: Tb3+ and Sr2 MgSi3 O9 Tb3+, Ce3+ were synthesized by gel-combustion method in weak reductive environment. The as-synthesized phosphors were investigated by XRD, SEM and fluorescence spectrophotometer. The results show that Sr2MgSi3 O9:Tb3+ and Sr2 MgSi3 O9: Tb3+ , Ce3+ phos-phors possess the similar tetragonal crystal structure as that of Sr2MgSi2 O7. The initial particles of as-synthe-sized phosphors are nearly spherical in shape, and the particle size is about 100nm in diameter. The excitation spectrum of Sr2MgSi3 O9:Tb3+is a broad band and the main peak is at 249nm. The emission spectrum is com-posed of a series of peaks, located respectively at 473,491,547 and 585nm. The main peak is at 473nm (5D3→7F3),and the secondary peak is at 547nm(5D4→7F5). The excitation spectrum of Sr1.955MgSi3O9:Tb3+0.04,Ce3+0.005 displays two broad bands with two peaks around 249 and 335nm respectively; the latter peak is much stronger than the former. Under 335nm irradiation, the emission spectrum is composed of two parts. One part is a broad band at around 400nm,which belongs to the emission of Ce3+. The other part is composed of a series of peaks,located respectively at 491,547 and 588nm. These emission peaks are ascribed respectively to Tb3+ ionstransition of 5D4→7FJ (J=6,5,4) in Sr2MgSi3O9:Tb3+,Ce3+. The main emission peak is at 547nm(5D4→7F5). Moreover, the effect of Ce3+ doping amount on luminescent intensity was discussed. It is found that en-ergy transfer from Ce3+ to Tb3+ is efficient and sensitization lie in Ce3+ to Tb3+ in Sr2MgSi3O9 host under UV light.