摘要
以硫酸盐型稀土层状化合物[(La_(0.97)Yb_(0.02)Tm_(0.01))_(2)(OH)_(4)SO_(4)·2H_(2)O]为模板,通过牺牲模板法水热合成(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)纳米晶,合成过程不需添加任何有机物同时不需后续煅烧过程。反应模板和所制备的(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)纳米晶的晶体形貌、晶体结构以及上转换荧光性能分别由场发射扫描电子显微镜、透射电子显微镜、X射线衍射仪和荧光光谱仪测试分析得出。结果表明,在F^(-)与(La_(0.97)Yb_(0.02)Tm_(0.01))^(3+)摩尔比为5、水热温度为180℃、水热反应24h条件下,合成了六方结构的(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)上转换纳米晶。场发射扫描电子显微镜、透射电子显微镜分析表明模板结晶为超薄纳米板片,长度约490nm,厚度为40nm,(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)的平均粒径分布在30~65nm,厚度大约为10nm。当发射激光波长为978nm时,(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)纳米晶体在804nm(^(3)H_(4)→^(3)H_(6)跃迁)处显示近乎纯净的上转换发光,位于487nm附近的蓝光发射近乎完全淬灭。通过计算发光强度与泵浦功率的关系得出制备的纳米晶体的上转换发射过程为三光子过程。
The sulfate-type rare earth layered compound(La_(0.97)Yb_(0.02)Tm_(0.01))_(2)(OH)_(4)SO_(4)·2H_(2)O was used as template to synthesize(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)nanocrystals by the sacrificial template method.The synthesis process did not need any organic reagent additive and subsequent calcination process.The crystal morphology,structure and upconversion fluorescence properties of the template and(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)product were tested and analyzed by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM)and fluorescence spectrometer.The results showed that when F^(La_(0.97)Yb_(0.02)Tm_(0.01))^(3+)(molar ratio)=5,the phase transformation could be completed at 180C for 24 hours,and the hexagonal structure(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)upconversion nanocrystals were successfully synthesized.The analysis of FESEM and TEM indicated that the template crystallized into ultra-thin nano-panel,with a length about 490nm and a thickness of 40nm.The average particle size distribution of(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)was 30~65nm and thickness was about 10nm.The up-conversion luminescence study revealed that(La_(0.97)Yb_(0.02)Tm_(0.01))F_(3)nanocrystals exhibited nearly pure near infrared up-conversion luminescence at 804nm(^(3)H_(4)→^(3)H_(6)transition)under the excitation of 978nm laser,and the blue light emission at about 487nm was almost completely quenched.According to the relationship between pump power and luminous intensity,the upconversion emission process was a three-photon process.
作者
滕雨含
龚长帅
王彬
王渤文
胡志鹏
王雪娇
Teng Yuhan;Gong Changshuai;Wang Bin;Wang Bowen;Hu Zhipeng;Wang Xuejiao(College of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013)
出处
《化工新型材料》
CAS
CSCD
北大核心
2023年第S02期317-321,共5页
New Chemical Materials
基金
大学生创新创业训练计划(D202303120931302744)
辽宁省自然科学基金(2020-MS-286)
作者简介
滕雨含(2002-),女,本科生,主要从事稀土发光材料研究工作,E-mail:tengyuhan2002@163.com;通讯作者:王雪娇(1987-),女,副教授,研究方向为稀土发光材料,E-mail:wangxuejiao@bhu.edu.cn.
