Blue Electrogenerated Chemiluminescence from Halide Perovskite Nanocrystals  

作　　者：Yiliyasi Wusimanjiang Jeetika Yadav Victoria Arau April ESteen Nathan IHammer Shanlin Pan 

机构地区：[1]Department of Chemistry and Biochemistry,The University of Alabama,Tuscaloosa,AL 35487,USA [2]Chemistry and Biochemistry,The University of Mississippi,Oxford,MS 38677,USA

出　　处：《Journal of Analysis and Testing》2019年第2期125-133,共9页分析检测（英文）

基　　金：We would like to thank the financial support from the National Science Foundation(NSF award CHE 1508192 and OIA-1539035).

摘　　要：Electrogenerated chemiluminescence(ECL)has been extensively used in ultrasensitive electroanalysis because it can be generated electrochemically without using expensive optics and light sources.Visible ECL emission can be obtained with a reasonable quantum yield and stability.Blue ECL is rare and often suffers from stability and poor quantum efficiency.Blue ECL emission at 473 nm from organometallic halide perovskite nanocrystals(PNCs),CH_(3)NH_(3)PbCl_(1.08)Br_(1.92),is reported here for the first time using tripropylamine(TPrA)as co-reactant.The blue ECL emission peak resembles its photoluminescence peak position.In addition to this blue emission peak,the ECL spectra of CH_(3)NH_(3)PbCl_(1.08)Br_(1.92) PNCs also showed a broad ECL peak at 745 nm.Generation of the second ECL peak at 745 nm from CH_(3)NH_(3)PbCl_(1.08)Br_(1.92) PNCs was can be explained by the existence of surface trap states on as-synthesized PNC due to incomplete surface passivation.Halide anion tunability of ECL emission from CH3NH3PbX3(X:Cl,Br,I)PNCs is also demonstrated.The fluorescence microscopy image of single PNC and stability of selected single PNCs are presented in this with simultaneous acquisition of fluorescence spectra using 405-nm laser excitation.The photoluminescence(PL)decay was described by PL lifetime(τ)of 1.2 ns.The effect of the addition of surfactants(oleic acid and n-octylamine)on the fluorescence intensity and stability of CH_(3)NH_(3)PbCl_(1.08)Br_(1.92) PNCs is also discussed.

关 键 词：ECL(electrogenerated chemiluminescence) Photoluminescence(PL) Perovskite nanocrystals(PNCs) Blue light emission Photoluminescence quantum yield(PLQY) SURFACTANTS 

分 类 号：O61[理学—无机化学]