摘要
All-inorganic perovskite nanocrystals(AIPNCs)possess the advantages of narrow emission spectrum,high quantum efficiency of luminescence and tunable luminescence position,which show a broad application prospect in the fields of optoelectronic materials and devices.Ion doping can tune their pristine crystal structures and luminescent properties or endow the AIPNCs with additional functionalities.Herein,a microfluidic reactor is designed to produce the Ce3+-doped AIPNCs based on the continuous-flow reaction.The mechanism of the flow synthesis of Ce3+-doped AIPNCs is the efficient physical mixing of the precursor ions in the confined micro-channel,the reaction nucleation of crystal seeds in the poor solvent and the crystal growth of the doped AIPNCs along the flow direction.The synthesis process can be on-line monitored by an optical fiber absorption spectrometer and an optical fiber fluorescence spectrometer.The doping concentration of Ce3+can be facilely controlled by changing the flow parameters in the microfluidic reactor,and the highest value reaches 1%.The Ce3+doping can improve the photoluminescence efficiency and the stability of the AIPNCs.The Ce3+-doped CsPbBr3AIPNCs can be used to manufacture green light-emitting diodes(LEDs)with a high color purity of93.3%and white LEDs with correlated color temperature(CCT)of 10,436 K,CIE color coordinates of(0.261,0.317)and color-rendering index(CRI)of 72.1.The continuous and controllable synthesis of AIPNCs by microfluidic reactor opens up new avenues for the application of the high-performance optoelectronic materials and devices.
全无机钙钛矿纳米晶具有发射光谱窄、发光量子效率高和发光波长可调等优点,在光电子材料和器件领域具有广阔的应用前景.离子掺杂可以调节其原始的晶体结构和发光性能,或者赋予其额外的功能.本文设计了一种基于连续流动反应制备Ce3+掺杂的全无机钙钛矿纳米晶的微流控反应器.流动合成Ce3+掺杂全无机钙钛矿纳米晶的机理是前驱体离子在限域微通道中的有效物理混合、晶种在不良溶剂中的反应成核以及全无机钙钛矿纳米晶沿着流动方向的晶体生长.利用光纤式吸收光谱仪和光纤式荧光光谱仪可以对合成过程进行在线监测.通过改变微流控反应器的流动参数,可以便捷地控制Ce3+的掺杂浓度,最高可达1%.Ce3+掺杂可以提高全无机钙钛矿纳米晶的光致发光效率和稳定性.Ce3+掺杂的CsPbBr3全无机钙钛矿纳米晶可用于制造色纯度高达93.3%的绿色发光二极管,以及色温为10,436 K、CIE色坐标为(0.261,0.317)、显色指数(CRI)为72.1的白色发光二极管.微流控反应器连续可控合成全无机钙钛矿纳米晶为高性能光电材料和器件的应用开辟了新途径.
作者
Pengcheng Lin
Hongbin Chen
Zhan Wei
Yingru Lin
Jinghui Lin
Ying Chen
Zhengdong Cheng
林鹏程;陈虹滨;魏崭;林映汝;林景辉;陈颖;成正东(Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,School of Materials and Energy,Guangdong University of Technology,Guangzhou Higher Education Mega Center,Guangzhou 510006,China;Artie McFerrin Department of Chemical Engineering,Texas A&M University,College Station,Texas 77843-3122,USA)
基金
supported by the National Natural Science Foundation of China(61805047)
Guangdong Special Support Program(2017TX04N371)
Guangzhou Science Technology and Innovation Commission(201807010108)
the Natural Science Foundation of Guangdong Province(2019A1515011379)
Foshan Municipal Science and Technology Bureau Project(2015IT100162)。
