摘要
采用溶剂热法制备了不同Mn^(2+)掺杂量的NaBiF_4∶Yb/Er/Mn上转换发光体系,研究了其形貌、晶相、上转换发光性能随Mn^(2+)掺杂量的变化,并探讨了该体系的能量传递机理.实验结果表明,Mn^(2+)的掺杂不会引起NaBiF_4从六方相转变为立方相,但会增大其尺寸;同时在NaBiF_4体系中,Mn^(2+)可以与Er^(3+)进行能量传递,使红光发射得到增强,并且随着Mn^(2+)浓度的增加,红/绿光发射强度比也会随之增大.此外,还考察了NaBiF_4∶Yb/Er/Mn体系的变温发射光谱,发现当温度升高时,红/绿光强度比以及520 nm绿光与540 nm绿光发射强度比都总体上呈增大趋势.
NaBiF_4∶Yb/Er/Mn samples with different concentrations of Mn^（2＋） were fabricated via the solvothermal method.Also,the morphology and crystal phase,the changes of upconversion luminescence（UCL） upon different doping amounts of Mn^（2＋）were investigated.Meanwhile,the mechanism of energy transfer in NaBiF_4∶Yb/Er/Mn was also discussed.The results indicate that,for NaBiF_4∶Yb/Er,Mn^（2＋） doping does not induce transition from hexagonal to cubic phase,but increases the size of the particles.Meanwhile,the energy transfer processes between Er^（3＋） and Mn^（2＋） can take place in NaBiF_4 host,which eventually enhances the red emission to a certain degree.With the increasing of the concentration of Mn^（2＋）,the intensity ratio of red to green emission is also increased.In addition,the temperature-dependent UCL spectra of NaBiF_4∶Yb/Er/Mn was investigated,and the intensity ratios of red to green emission and 520 nm green emission to 540 nm green emission are generally increased with elevated temperature.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第12期2135-2143,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21371165
21590794
21210001
21521092)
中国科学院前沿科学重点研究项目(批准号:YZDY-SSW-JSC018)资助~~
