功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2015年
3期
3148-3152
,共5页
BST 铁电厚膜%稀土离子%共掺杂%上转换发光
BST 鐵電厚膜%稀土離子%共摻雜%上轉換髮光
BST 철전후막%희토리자%공참잡%상전환발광
BST thick films%rare-earth ions%codoped%upconversion-luminescence
利用丝网印刷工艺制备出稀土 Yb3+/Tm3+共掺杂的 Ba0.8 Sr0.2 TiO3铁电陶瓷厚膜,利用 XRD、SEM、EDS、Raman和荧光光谱仪研究了稀土掺杂对厚膜微结构和发光性能的影响.实验发现,在低掺杂量时Yb3+、Tm3+离子在BST晶格中首先替代B位离子,高掺杂量时则同时占据 A位和B位离子.掺杂后的厚膜仍表现为典型的铁电四方相结构.在800 nm近红外激光激发下,共掺杂的 BST 厚膜中的 Tm3+离子通过Yb3+离子的敏化作用在468与533 nm处实现了间接上转换蓝色与绿色荧光输出,分别对应于Tm3+离子的1 G4→3 H6跃迁和1 D2→3 F4跃迁.468 nm蓝色荧光强度随着 Yb3+、Tm3+离子比的增加先增强后减弱,在 Yb3+、Tm3+离子共掺比为2∶1达到最大,并对上转换发光的机理进行了分析.
利用絲網印刷工藝製備齣稀土 Yb3+/Tm3+共摻雜的 Ba0.8 Sr0.2 TiO3鐵電陶瓷厚膜,利用 XRD、SEM、EDS、Raman和熒光光譜儀研究瞭稀土摻雜對厚膜微結構和髮光性能的影響.實驗髮現,在低摻雜量時Yb3+、Tm3+離子在BST晶格中首先替代B位離子,高摻雜量時則同時佔據 A位和B位離子.摻雜後的厚膜仍錶現為典型的鐵電四方相結構.在800 nm近紅外激光激髮下,共摻雜的 BST 厚膜中的 Tm3+離子通過Yb3+離子的敏化作用在468與533 nm處實現瞭間接上轉換藍色與綠色熒光輸齣,分彆對應于Tm3+離子的1 G4→3 H6躍遷和1 D2→3 F4躍遷.468 nm藍色熒光彊度隨著 Yb3+、Tm3+離子比的增加先增彊後減弱,在 Yb3+、Tm3+離子共摻比為2∶1達到最大,併對上轉換髮光的機理進行瞭分析.
이용사망인쇄공예제비출희토 Yb3+/Tm3+공참잡적 Ba0.8 Sr0.2 TiO3철전도자후막,이용 XRD、SEM、EDS、Raman화형광광보의연구료희토참잡대후막미결구화발광성능적영향.실험발현,재저참잡량시Yb3+、Tm3+리자재BST정격중수선체대B위리자,고참잡량시칙동시점거 A위화B위리자.참잡후적후막잉표현위전형적철전사방상결구.재800 nm근홍외격광격발하,공참잡적 BST 후막중적 Tm3+리자통과Yb3+리자적민화작용재468여533 nm처실현료간접상전환람색여록색형광수출,분별대응우Tm3+리자적1 G4→3 H6약천화1 D2→3 F4약천.468 nm람색형광강도수착 Yb3+、Tm3+리자비적증가선증강후감약,재 Yb3+、Tm3+리자공참비위2∶1체도최대,병대상전환발광적궤리진행료분석.
The Yb3+/Tm3+ co-doped BST thick films were prepared by screen printing process on alumina sub-strates.The effect of rare earth ions doping on the microstructure and photoluminescence properties were inves-tigated.It was found that Tm3+ and Yb3+ ions substituted for B site ions when the concentration was small.The RE ions can substitute both A site and B site with increasing RE ions concentration.The PL spectra of the Yb, Tm co-doped BST thick films were measured with 800 nm excitation source at room temperature.The 468 nm blue up-conversion luminescence was assigned to 1 G4→3 H6 transition of the Tm3+,and the 533 nm green up-conversion luminescence was assigned to 1 D2→3 F4 transition of the Tm3+ with the sensitization of Yb3+.The in-tensity of the 468 nm luminescence peeks first became stronger then decreased as increasing the ratio of the Yb3+ and Tm3+,the luminescence intensity reached the maximum at the ratio of 2∶1 for Yb3+ and Tm3+.The mechanism of indirect up-conversion luminescence was also studied.