pH值对NaYW_2O_8∶Ln^(3+)微米晶形成及上/下转换荧光的影响（英文）  

Effect of pH Value on Synthesis of NaYW_2O_8∶Ln^(3+) Microcrystals with Tunable up/down Conversion Luminescence

作　　者：任丽微 王国凤[1] 崔靖玉 李莹[1] 范乃英[1] 潘凯[1] 刘帅[1] 冯丽[1] 

机构地区：[1]黑龙江大学化学化工与材料学院,功能无机材料化学教育部重点实验室,哈尔滨150080

出　　处：《无机化学学报》2013年第12期2631-2636,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21171052);教育部新世纪优秀人才支持计划(No.NCET-11-0959);黑龙江省博士后科学基金(No.LBH-Q11009);哈尔滨科技创新人才专项资金(No.RC2013QN017028);黑龙江省自然科学基金(No.ZD201301);黑龙江大学杰出青年科学基金资助项目

摘　　要：用水热法合成了NaYW2O8∶Ln3+(Ln=Yb/Er and Eu)微米晶,并研究了pH值对微米晶组成、形貌和荧光性质的影响。通过调节微米晶的形貌和结构对微米晶的上转换荧光进行了调控。在NaYW2O8∶Eu3+微米晶的激发光谱中,Eu3+-O2电荷迁移带和W6+-O2-跃迁与Eu3+离子的f-f激发峰的比值随着微米晶的形貌和结构的不同发生改变。Tetragonal phase NaYW2Os：Ln^3＋ （Ln=Yb/Er and Eu） microcrystals were synthesized using a hydrothermal method and a subsequent calcination treatment. The effect of pH value of the reaction solutions on the phase composition, morphologies, and luminescence properties of NaYW2O8：Ln3＋ microcrystals was investigated. Upconversion luminescence tuning of NaYW2O8：Er3＋/yb3＋ under 980 nm excitation was achieved by adjusting the crystal structure and morphology of samples. The upconversion luminescence mechanism was also investigated. In the excitation spectra monitored at 618 nm of NaYW2Os：Eu3＋, the intensity ratio of the charge transfer bands of the Eu3＋-O2- and W6＋-O2- transitions to the f-f shell transitions of Eu3＋ ions changed with the structure and morphology of the sample. Under 254 and 396 nm excitation, the 5D0→7F1, 5D0→TF2, 5D0→TF3, and 5D0→TF4 emissions were observed. For the sample prepared at pH=12, the 5D0→7F1 emission was split into two sub-bands.

关 键 词：L^3+ 微米晶 水热法 荧光 

分 类 号：O482.31[理学—固体物理]