兵器材料科学与工程
兵器材料科學與工程
병기재료과학여공정
Ordnance Material Science and Engineering
2013年
4期
14-18
,共5页
发光%硅酸盐%锶长石%镓置换%Eu2+
髮光%硅痠鹽%鍶長石%鎵置換%Eu2+
발광%규산염%송장석%가치환%Eu2+
luminescence silicate%Sr-feldspar%Ge4+ substitution%Eu2+
通过高温固相合成Sr0.955Al2Si2-xGexO8∶Eu2+(x =0~1.0)系列试样荧光粉,系统研究Ge4+置换Si4+对其晶体结构和光谱特性的影响。Ge4+以类质同相替代SrAl2Si2O8晶格中的Si4+形成连续固溶体,晶胞参数a,b,c,β和晶胞体积V随Ge4+置换量的增加呈线性递增。荧光激发谱为宽带,位于230~400 nm,可拟合成4个峰,表观峰值位于351 nm处;随着Ge4+置换量的增加,半高宽从105 nm减小到95 nm。发射光谱位于380~600 nm,可由406 nm和441 nm两个峰拟合而成,表观峰值位于407 nm处;随着Ge4+置换Si4+进入基质晶格,造成Eu—O距离变小,使Eu2+所处的晶体场强度增强,发光中心Eu2+的5d能级分裂增大,造成Eu2+最低发射能级重心下移,两拟合谱峰峰位均呈线性红移。
通過高溫固相閤成Sr0.955Al2Si2-xGexO8∶Eu2+(x =0~1.0)繫列試樣熒光粉,繫統研究Ge4+置換Si4+對其晶體結構和光譜特性的影響。Ge4+以類質同相替代SrAl2Si2O8晶格中的Si4+形成連續固溶體,晶胞參數a,b,c,β和晶胞體積V隨Ge4+置換量的增加呈線性遞增。熒光激髮譜為寬帶,位于230~400 nm,可擬閤成4箇峰,錶觀峰值位于351 nm處;隨著Ge4+置換量的增加,半高寬從105 nm減小到95 nm。髮射光譜位于380~600 nm,可由406 nm和441 nm兩箇峰擬閤而成,錶觀峰值位于407 nm處;隨著Ge4+置換Si4+進入基質晶格,造成Eu—O距離變小,使Eu2+所處的晶體場彊度增彊,髮光中心Eu2+的5d能級分裂增大,造成Eu2+最低髮射能級重心下移,兩擬閤譜峰峰位均呈線性紅移。
통과고온고상합성Sr0.955Al2Si2-xGexO8∶Eu2+(x =0~1.0)계렬시양형광분,계통연구Ge4+치환Si4+대기정체결구화광보특성적영향。Ge4+이류질동상체대SrAl2Si2O8정격중적Si4+형성련속고용체,정포삼수a,b,c,β화정포체적V수Ge4+치환량적증가정선성체증。형광격발보위관대,위우230~400 nm,가의합성4개봉,표관봉치위우351 nm처;수착Ge4+치환량적증가,반고관종105 nm감소도95 nm。발사광보위우380~600 nm,가유406 nm화441 nm량개봉의합이성,표관봉치위우407 nm처;수착Ge4+치환Si4+진입기질정격,조성Eu—O거리변소,사Eu2+소처적정체장강도증강,발광중심Eu2+적5d능급분렬증대,조성Eu2+최저발사능급중심하이,량의합보봉봉위균정선성홍이。
A series of phosphors Sr0.955Al2Si2-xGexO8∶Eu2 +(x=0-1.0)were prepared by high temperature solid?state reaction. The effects of Ge4 +substitution for Si4 + on the host lattice and spectral properties were investigated. The results show that complete solid solutions are formed while Ge4+ enters SrAl2Si2O8 lattice and substitutes Si4+. The lattice parameters(a,b,c,β)and unit cell volume increase linearly as Ge4 + content increases in the phosphors. A broad excitation spectrum consists of four excitation bands,which locate between 230 nm and 400 nm,the maximum emission wavelength of which is at 351 nm. The FWHM of the apparent excitation peak narrows from 105 nm to 95 nm. The emission spectrum,which is also a broad band between 380 nm and 600 nm,can be fitted by two peaks at 406 nm and 441 nm and its apparent peak is at 407 nm. The distance of Eu and O becomes shortened due to Si4+ is replaced by Ge4+. The crystal field of the emitting center Eu2+ location is enhanced,the splitting of 5d orbital levels is increased and the lowest emission level is expanded to lower,two fitted peaks are red shifted in a linear way.