摘要
近年来,铅卤钙钛矿CsPbX_(3)(X=Cl,Br或I)因其具有荧光波段可调、荧光量子产率高(Photoluminescence quantum yield,PLQY)以及荧光半峰宽窄等优点而被广泛应用于光电器件领域.然而,与PLQY接近于100%的绿光和红光相比,蓝光卤素钙钛矿的PLQY仍比较低.在此,采用过饱和结晶的方法在室温下合成了粒径低于4 nm的超小晶粒锡(Sn)掺杂CsPbBr_(3)量子点,并对其结构特性和光学特性进行了研究.结果表明:随着SnBr_(2)添加量的增大,量子点晶粒的粒径略微减小,荧光发射峰发生蓝移,粒径由3.33 nm(SnBr_(2)为0.03 mmol)减小到2.23 nm(SnBr_(2)为0.06 mmol时),对应的荧光发射峰由490 nm蓝移至472 nm.当SnBr_(2)添加量为0.05 mmol时合成的超小晶粒锡掺杂CsPbBr_(3)量子点显示出最优的光学性能,其粒径约为2.91 nm,对应的XRD各晶面衍射峰强度最强,荧光发射峰位于472 nm处,PLQY最高,达到了53.4%,在空气中存放15 d后,其荧光发射峰位置不发生明显改变,荧光PLQY仍保留最初的80%,为42.7%.证明适量添加SnBr_(2)对CsPbBr_(3)进行锡掺杂可有效提高超小晶粒量子点的结晶性能和光学性能.
All-inorganic perovskite CsPbX_(3)(X=Cl,Br and I)quantum dots(QDs)have been wildly utilized in optoelectronic devices due to their tunable photoluminescence,high photoluminescence quantum yield(PLQY),and narrow-line width photoluminescence.However,the blue luminescence PLQY of CsPbX_(3) perovskite quantum dots is still lower than their red and green luminescence counterparts(PLQYs nearly 100%).Here in this work,we present a handy strategy to synthesise the ultra-small blue luminescence Tin-doped CsPbBr_(3) perovskite QDs by supersaturated recrystallization synthetic approach at room temperature,and the particle size of as-prepared QDs is lower than 4 nm.The crystal structure and optical property of Tin doped CsPbBr_(3) QDs are characterized by XRD,TEM,ultraviolet-visible spectrophotometer,and fluorescence spectrophotometer.The results show that the particle size of as-prepared QDs is slightly shrunk from 3.33 nm(SnBr_(2)0.03 mmol)to 2.23 nm(SnBr_(2)0.06 mmol)as the SnBr_(2) adding quantity increases,but there is no obvious change in the lattice spacing of doped QDs.The partial substitution of Pb for Tin leads the optical spectra to blue-shift from 490 nm(SnBr_(2)0.03 mmol)to 472 nm(SnBr_(2)0.06 mmol).The highest PLQY and the strongest XRD diffraction of ultra-small Tin doped CsPbBr_(3)blue luminescence QDs are obtained by adding SnBr_(2)0.05 mmol,and the blue luminescence peak is located at 472 nm with the PLQY of 53.4%.There is no any change in PL peak of Tin doped CsPbBr_(3) QDs(SnBr_(2)0.05 mmol)by storing it under the ambient atmosphere for 15 days,and the PLQY of Sn^(2+)doped QDs is still 80%of the initial after 15 days.It is concluded that the crystallization and optical property can be effectively improved in Tin doped CsPbBr_(3) QDs by partially replacing appropriate quantity of Pb by Tin.
作者
曾凡菊
谭永前
胡伟
唐孝生
张小梅
尹海峰
Zeng Fan-Ju;Tan Yong-Qian;Hu Wei;Tang Xiao-Sheng;Zhang Xiao-Mei;Yin Hai-Feng(School of Big Data Engineering,Kaili University,Kaili 556011,China;College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China;College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第4期213-219,共7页
Acta Physica Sinica
基金
贵州省科技计划项目(批准号:ZK[2021]245)
国家自然科学基金(批准号:61975023,61875211,51602033,61520106012)
凯里学院博士专项课题(批准号:BS_(2)02004,BS_(2)01301)
凯里学院学术新苗培养及创新探索专项课题(批准号:黔科合平台人才[2019]01-4)
贵州省教育厅创新群体重大研究项目(批准号:黔教合KY字[2018]035)资助的课题.
